Mini Misfiring Acceleration

I can understand how some engines, the plugs are expensive enough you would NOT want to toss good plugs, and one of my mini-vans I changed plugs and wires and still had misfires, cleaned everything and still got misfires, only on the third attempt, when I removed the coil pack to be able to more thoroughly clean it, did I see the carbon. Includes model range, engines, transmissions, safety equipment, crash testing, features and updates. my 998 mini city 1988 running. I have found that an ignition misfire will usually happen more under a load than at idle. hi, i have a 2003 taco with 2. Always begin replacing the easiest and cheapest part first, which is the fuel filter. 325i ignition misfire under hard acceleration I had a problem where under normal driving the car operated fine. The fuel system pressure must be tested to see if the fuel delivery system is the problem. if you're having multiple/random misfires , fuel delivery might be you issue. M112 engine recurring misfires on middle cyls under hard acceleration Newb to the PP forum but been on some others in the past. com and find specs, pricing, MPG, safety data, photos, videos, reviews and local inventory. Will pretty much go away after 3 to 4 miles of driving. * Higher corrosion protection. How much does a cylinder misfire repair cost?. About six months ago we started to experience a very slight misfire/hesitation. An engine misfire is a sensation that you should instantly recognize. 85 carrera, 3. Derived from oil ad/or fuel. Dealer says that normal for a CVT. Even if one of the cylinders interrupts the firing, your engine will. Issues in the fuel system could also be a reason for car shakes when stopped. He has certifications in automation and control technology. We were prepping the car for a Dyno run to try and replicate the issue when the tech noticed a ticking sound from under the valve cover. when i accellerate it feels as tho the car is hesitating, if i floor it it will come through like sort of a flat spot then all of a sudden accelerate quickly past certain revs, my setup is a 998 with decked head. It would misfire during DE's accelerating out of turns hard on the throttle. Could it be something else?. Long story so bare with me here. They're a combination of economy, luxury, and power - the three things that every automotive enthusiast (even the average driver) could wish for. With automotive misfires an ignition system is the first place to start looking for the misfire. They either go or stop completely, that was until they intrduced all this computerised electronic injection systems. The 2002 Ford Taurus has 6 problems reported for engine misfires (stalls) when accelerating. When your engine is misfiring, it can lead to vibrations, Manouchekian says. Pretty common. 120,000 miles. Long story so bare with me here. Hook them both back up correctly to the electrical and fuel. Typically, when the Check Engine Light is illuminated and it is flashing, this is an indication that the vehicle's engine is misfiring. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes". The cost of a new ignition coil depends on the make and model of the car. The car has done just over 56000 miles and the only mods is a 15% pulley and JCW air box. If you like the vids and want to help make more. The check engine light will most likely come on and stay on. The check engine light is on and the only code that comes up is the P0300, P0301, P0302 and P0303. MINI Cooper VANOS Timing Faults Caused by Vacuum Pump. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. Do not feel misfire, loss of power or acceleration. We were prepping the car for a Dyno run to try and replicate the issue when the tech noticed a ticking sound from under the valve cover. The engine usually feels rough, lacks power and uses more gas than usual. But if you put a little more foot into the throttle on take-off (i. It would sometimes take it, sometimes not. 5-liter EcoBoost engine and 26,000 miles. P0303 Tech Notes The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. How much does a cylinder misfire repair cost?. Initially it was smoking badly from the exhaust dark blue but now it seems to white smoke that puffs out as it misfires. Spark plugs and valve cover were already removed when I arrived. Of course, the battery's capacity helps smooth things out during periods of heavy load but wouldn't cause a misfire, at worst it would cau. I thought it was running out of fuel, but a friend told me it could be a vacuum sensor. BMW and MINI DIY Video, Why You Should Change Your BMW or MINI Spark Plugs Before the Recommended Intervals. What Causes A Cylinder To Misfire? There are several telltale signs of a misfiring cylinder. The primary villains are simple - spark or fuel - usually manifesting in spark plugs, plug wires, the coil(s) or the fuel-delivery system. The car got to 9500 miles, and whilst driving at 60mph started detonating again under partial throttle. The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. If your power steering pump has to be replaced it is a good idea to check out the. This means that the ability to write new posts and access various member features will go away. What could cause a misfire even though the spark plugs are ok? After a bit of self-diagnosis with the help of the bloke across the street it appears that no. Sometimes a misfire may feel like a vibration. The engine has an irregular tendensy to not run smothly, especially when accelerating from idle to 3000 rpm. The orange engine warning light flashes after a while but no other lights come on. PCM DTC P0430 and/or P0299. This covers the seven most common problems we run across in servicing Mini Coopers. A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. In diagnosing the misfire, some information is needed about the maintenance of the vehicle. I had to have the ecu flashed on my MCS, because I was experiencing a misfire under hard acceleration. No show more Sorry - additional required info. This means that the ability to write new posts and access various member features will go away. Hi, it's a 1996 Ford Aspire. If you like the vids and want to help make more. No, only on acceleration. 8t misfire codesat my wits end. It is often said that for an engine to run you need fuel, air, and spark. It then clears and is ok. Improve acceleration Carbon build-up from low-quality gasolines can negatively affect your engine to the point where acceleration lags. The Mini-Van known as Ford Windstar, produced between the years of 1994 and 2003, and equipped with the 3. It happens in an instant but you can still feel the car start to move, then "hesitate" from the shift, and then take off. What Does The Check Engine Light Mean When Illuminated?. The fuel system pressure must be tested to see if the fuel delivery system is the problem. Shop By Car Thanks for all your input and my apologies for the general misfire question. Low acceleration as you apply force to the gas pedal is a common problem. Check engine light hasn't come on, and no real alarming warning signs that i can tell. Problems after using seafoam *misfire cilinder 6* FIXED Discussion in '1994-2004 V6 Mustang Tech' started by 94pony, Feb 1, 2008. the backfire was gone but it still ran rough and had a misfire. i dont know what else could cause that to occur with a TBI engine, does it now and then, not every time though. submitted 1 year ago by R56 codier. One cylinder can misfire or more than one cylinder can Misfire depending on the situation. Rough/Loping Idle, Hesitation, Sulfur Smell. code 4) is typically a reliable form of family transportation. Why is this test so significant? It can be used to pinpoint the cause of a misfire when all the usual tests return normal results. Since it's happening across all cylinders, I'm a bit stumped. With the push to get more …. If it then runs better at high speed, you may have the wrong needles in the carbs. A misfire under load complaint can usually be broken down into 2 categories. Dealer wants to do a walnut shell blasting cleaning to remove carbon build up. Rough Acceleration. my mini has developed a misfire throughout acceleration, so say your driving along picking up speed, itll 'hiccup' a bit. Perfect alignment to prevent leakage and misfiring. mini cooper 2011 Complaints POWER TRAIN. 8t misfire codesat my wits end. The engine starts and ticks over fine and will accelerate if throttle is opened slowly with some misfire but when throttle. He has certifications in automation and control technology. Spark plugs and valve cover were already removed when I arrived. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 3. USUAL CAUSE There are many items that can cause the engine to miss or run roughly. i dont know what else could cause that to occur with a TBI engine, does it now and then, not every time though. A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. Ford Transit Common Problems Solutions Hints and Tips. If your car jerks while the vehicle is in gear, the issues could be caused by a mass air flow sensor, O2 sensor or the throttle body that could be clogged with excess carbon build-up. Replaced all plugs right after spark plug wires replaced. 4L with a weird misfire issue single electrode plugs won't cause a single cyl misfire but it's an easy place to start and verify the amount of attention to. It was like I'd installed a new engine. The orange engine warning light flashes after a while but no other lights come on. submitted 1 year ago by R56 codier. In this guide we explain the different kinds of smoke a car could emit and what they could mean. Also, make sure you jot down the other codes, as misfire can be caused by a malfunctioning component or system. This means that the ability to write new posts and access various member features will go away. You guys seem to have a few more technically oriented members so I thought I'd roll this past you. 2007 Mini Cooper S 1. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes". Ive pulled. I'm ashamed to admit my Sprite hasn't seen the light of day for many months this year for many reasons and now its bitten me in the backside by not running properly. I thought it may be a misfire but not sure. recently (this week) the car has seemed to been misfiring, especially during acceleration or on small inclined roads. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. Typically an engine misfire under load, will be a problem with the ignition system, while low engine speed problems will be a vacuum, fuel management or compression issue. 1st Gen R53 Cooper S Random Misfire or when driving at higher boost under harder acceleration? But I will check all the intercooler boots. Hi and welcome to the BMW fault codes (hex code) page. Replaced all plugs right after spark plug wires replaced. An engine misfires under acceleration due to faults in the spark plugs, plug wires or coils, or a weak fuel pump. "misfire on cylinder 5" cause could be bad spark plug dirty fuel injectors bad vaccuum tube other mechanical failure Car is a 2004 bmw z4 with 68,000 miles. The 2012 Ford F-150 has 12 problems reported for engine missfires under hard acceleration. Comments: hi guys I have a mini 2002 model it staed by misfiring and the one of the pluc sims like it was not working and then I have changed the plugs it cont6inued and today it is not starting at all,,any idear what is need from this car June 26, 2019 : Followup from the Pelican Staff: Could be the coils. The early failure can occur on both the 5 speed and 6 speed models and can fail in under 20,000 miles. Usually they assume it is a flat battery or being out of fuel. engine seems to be running on about 85-90% power with a thumping feel. Acceleration issue; A faulty throttle position sensor will not let your car accelerate normally. This generally causes the engine to run rough, jerk, or buck. Your MINI’s fuel injectors play a critical role in initiating combustion and ignition. But under hard acceleration, say accelerationg at high way speeds of 60 or higher, the CEL would come on and the car would start to bog down. Anyone have any idea why our 1. MINI cars have grown to be one of the most highly desired vehicle son the market today. No, only on acceleration. BMW or MINI Spark Plug Fouling – Misfire Fault Codes P0300, P0301, etc. These bolts secure the fulcrum of the lever that opens the valve. That is to say combustion may be disrupted. This page contains BMW hex fault codes, and the fault code definitions! We hope you find this page useful, we recommend using your browsers find on page feature to search the page for your BMW fault code. Typically, when the Check Engine Light is illuminated and it is flashing, this is an indication that the vehicle's engine is misfiring. My ambient lights have always changed when flicking through modes green/mid/sport. Comments: hi guys I have a mini 2002 model it staed by misfiring and the one of the pluc sims like it was not working and then I have changed the plugs it cont6inued and today it is not starting at all,,any idear what is need from this car June 26, 2019 : Followup from the Pelican Staff: Could be the coils. I have a 2012 Mini Clubman and I'm getting a CEL stating misfire on Cylinder 1 & 3. If the misfire continues then check the secondary voltage pattern, ensure there is no damage to the catalyst, check the above possible causes, then reprogram the DME. 8 inches long—that's 8. I Agree, you may want to look into the o2's. Analyzing Ignition Misfires Download PDF. You mig ht have a power problem. This article applies to the 1st Gen Mini Cooper (2001-2006). A lack of acceleration is also a danger signal. Why is the engine bogging under acceleration? I recently managed to get the moped running properly, albeit for only a short time. diesel engine misfires under load , astra 1. code 4) is typically a reliable form of family transportation. Misfires & hesitation of this sort are caused by many factors from fuel quality, fuel & ignition systems, BPV, all those sensors that BMW put in, etc,etc Just had a long diagnostic journey w/ such. The engine. Even if one of the cylinders interrupts the firing, your engine will. The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Culver City, West Los Angeles, and South Bay, CA area and experiencing acceleration stumble in your Mini give us a call. 5-liter EcoBoost engine and 26,000 miles. So you either have to rotate your tires more often or buy new tires. What do you think?. what happens is a hesitation in the acceleration of the mini from a start or at low rpms. I thought it may be a misfire but not sure. Some of the common occurrences include. I looked under the hood, seen a little bit of oil residue on the valve cover by the PCV valve, didn't think nothing of it. VW TDI misfire solved! - mini, pug, landy, Andy : i regularly notice a partial vacuum when i open the cap to fill especially if the tank is getting low this has happened from new (1998) wonder if it has anything to do with my current problem (see peugeot 306 d turbo engine problem). a mechanic replaced all eight plugs and a new coil pack for the one that blew. The air mixes with the fine spray of fuel inside the engine and is then lit by the spark plug, causing a controlled explosion, which moves the pistons. Once the build-up reaches the maximum tolerable level, the engine will begin to run rough and misfire. Rover Mini Engine Misfire. Best Answer: Diesels dont as a rule misfire. Typically, when the Check Engine Light is illuminated and it is flashing, this is an indication that the vehicle's engine is misfiring. 000 km on it. It rather indicates to a problem in the engine - either a broken or damaged part. As mentioned, a cylinder misfire can happen due to a few reasons, and to make things simple, we created a table to show you exactly what repairs may be required to fix the misfire condition. What does that mean? This is a generic powertrain code, which means it covers all makes/models, 1996-newer. So I have a 02 plate clio grande with 106k miles on the clock Last night I was driving home from work and had stopped at some lights, when I pulled away I went into second, and when i put my foot down i noticed there was very little power, into third and foot down again and the car starts quite violently juddering until i back off the accelerator. at idle it shakes a bit, rpms jump up and down, rarley stable. This page contains BMW hex fault codes, and the fault code definitions! We hope you find this page useful, we recommend using your browsers find on page feature to search the page for your BMW fault code. If no leak are found the next step is to replace the spark plugs. Was called in to diagnosis a 2008 Mini Cooper S turbo with a severe misfire issue. Paddy's Garage is a record of MY interests in all British Cars. Problems after using seafoam *misfire cilinder 6* FIXED Discussion in '1994-2004 V6 Mustang Tech' started by 94pony, Feb 1, 2008. Smooth-Running Value and Misfiring Detection The smooth-running values of the individual cylinders are indicated for troubleshooting purposes. 1 Cylinder Misfire Puget Sound Mini Motoring Club Forums Page 1. A recomended mechanic has made two repairs and the problem has persisted. If a Diesel has a permanent misfire it is usually injector trouble or it has a compression off on one cylinder. Like any part, time and. Rover Mini Engine Misfire. the approximate failure mileage was 56,000. The Malfunction Indicator Lamp (MIL) is on and you've just found a misfire code. Misfire Detected with Low Fuel. The car has done just over 56000 miles and the only mods is a 15% pulley and JCW air box. The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. From the odd misfire it gradually deteriorated to extended loss of power (for a few seconds, especially when cold and wet). misfires under acceleration. I have had five Sciroccos - and I have had this issue five times. Over the past few years I've noticed a few other things that can cause a misfire code to set that are not caused by BAD ignition coils. Here is a hint. Why is the engine bogging under acceleration? I recently managed to get the moped running properly, albeit for only a short time. 000 km on it. haven't changed the spark plugs since I bought it with 21,000 miles. Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. It probably makes sense to pursue the detected igniter and evap issues first, and see if you could get the misfiring under control that way. The engine has an irregular tendensy to not run smothly, especially when accelerating from idle to 3000 rpm. 6 L 118 hp Gas Top 5 Reasons. In my case, it was HT leads but I have been told in this forum that 45s have individual coils and the system is considered reliable - so that doesn't help. First time posting to any kind of forum; so that said, I have a 2012 Mini Cooper S that is misfiring in cylinders 1,2 and 3. If you have the replacement professionally done then the labor costs will be between $50 and $100 per hour. the approximate failure mileage was 56,000. 5 inches longer than the Clubman, which shares its platform and. Earlier today we took apart an engine from a 2008 MINI Cooper S with 75,000 miles on the odometer. Doesnt seem to want to take a rev. When one or more cylinders stops firing, the power cuts, and the vehicle hesitates under acceleration. My Profile My Preferences My My MINI One has 110,000 miles onto clock but is well looked after and regularly serviced. Could it be something else?. Intermittent stumble and/or misfire on hard acceleration after an extended drive at highway speeds being more noticeable during humid or damp conditions. 4? misfiring intermittently, also engine warning warning light coming on now and again. it runs great now. 8-liter V-6 engine (V. A misfire under load complaint can usually be broken down into 2 categories. The readiness flags (emission monitors) are not complete. I have just changed all the spark plugs and ignition coils 3 month ago. The ignition timing of the 125 Micro MAX evo, 125 Mini MAX evo, and 125 MAX evo engines remain the same as the current engines; therefore, these 3 engines use the same Dellorto electronic box. ; After PCM reprogramming, it is no longer necessary to road test the vehicle to “relearn” KAM (Keep Alive Memory). This page contains BMW hex fault codes, and the fault code definitions! We hope you find this page useful, we recommend using your browsers find on page feature to search the page for your BMW fault code. i suspected the o2 but wasn't sure until the engine light came. Hi, I've been having an intermittant issue where my cooper s clubman seems to misfire under heavy acceleration. Hesitation in acceleration, acceleration surge at both high and low speeds, delay in acceleration, etc. Engine misfires during acceleration, small throttle opening and WOT. The technician said 4 of the 6 fuel injectors were shot and needed replacing. If the engine has a misfire, then each time that cylinder fires it will cause the engine to run rough for a split second. It's like the spark ceases under high compression pressures. Hi all, 1st post but have been watching ETCG for a year or so. Reasons Behind Acceleration Stumble in MINI by fastladmin November 17, 2018. With a misfire. they just might inspire your next diagnostic move/test:. Error Code P0303 is a common error code that indicates a misfire problem in the engine’s cylinder, specifically cylinder #3. A catalytic converter (or "cat") is an important part of any Ford F-150's exhaust system that converts harmful compounds into harmless ones. Will pretty much go away after 3 to 4 miles of driving. This case study is on a 1995 Chrysler Town and Country Minivan with a 3. We help Autologic users diagnose and repair these faults almost every day. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 3. i noticed on the dash hawk that bank one short term fuel trim was going -15% then back to 0 and sometimes not moving from 0 for awile. This is why many vehicle manufacturers continue to improve and tweak their engines with the release of every model to ensure that they are not only efficient, but that they are also powerful and as environmentally sound as possible. Paddy's Garage is a record of MY interests in all British Cars. i must say though that i did have a engine code for "misfire at #4 cylinder" prior to changing the plugs. This article applies to the 1st Gen Mini Cooper (2001-2006). Do not feel misfire, loss of power or acceleration. If power loss comes from misfiring spark plugs, the degree of power loss corresponds with the rate of spark plugs. Also make sure that all the vacuum pipes and sensors that operate the turbo are operating correctly. If yours are original, then that could be the cause. I am hoping new injec. Severe misfiring can quickly lead to serious dam- age of emissions-related components, espe- cially the catalytic converter. The engine usually feels rough, lacks power and uses more gas than usual. If you're having trouble staring your MINI, the car's engine is misfiring/surging, or you're experiencing a lack of acceleration, chances are the car's spark plugs need to be replaced. In diagnosing the misfire, some information is needed about the maintenance of the vehicle. Well, the Mini that runs on SPi engine is really fun to drive and I couldn’t stop myself from driving the car up to 150 km/h (approx 93 mph). My car misfires under sudden acceleration. if you're having multiple/random misfires , fuel delivery might be you issue. You will feel, and maybe hear, this as a brief stutter in the engine. He attributed this to "unintended acceleration" and maintained that his foot was on the brake the entire time. No show more Sorry - additional required info. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure. When testing the new software test the vehicle with the same conditions the misfire first occurred at. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes". it runs great now. It is often said that for an engine to run you need fuel, air, and spark. Why Does My Car Lose Power?. A recomended mechanic has made two repairs and the problem has persisted. Initially it was smoking badly from the exhaust dark blue but now it seems to white smoke that puffs out as it misfires. It's one of the most common reasons why a car jerks when accelerating. Modern cars use very little fuel when idle. Vacuum Leak Symptoms: Acceleration Problems and Misfiring. If you have the replacement professionally done then the labor costs will be between $50 and $100 per hour. If your misfire goes away - you found the problem. If the misfire follows, then you will have narrowed it down to the bad injector. Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. the vin was not available. consumer stated other mini cooper countryman vehicles, same year, make, and model had recalls for this exact issue,however, this vin was not included in the recall. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes". Engine misfires can be caused by a list of faults, but there are a few suspects that occur more than others. A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. The Mini-Van known as Ford Windstar, produced between the years of 1994 and 2003, and equipped with the 3. Fuel and air comes from the fuel system and carburetors. Plenty of power. No acceleration when car in Drive. same sound as when one of my plug wires fell off. Dear Tom and Ray: My brother-in-law, who never makes mistakes, drove his 1986 Nissan Maxima off the end of his driveway and into the woods. I've driven my Honda for a few days now and it still won't cycle through to get it to pass the smog. Let's first learn the basics of acceleration stumbling and discuss how you can properly address this issue with professional help. The check engine light will most likely come on and stay on. I replaced the spark plugs, wires and coil pack. 8t misfire codesat my wits end. If yours are original, then that could be the cause. They will be able to completely diagnose it, what is causing it, and repair it before more damage is done. As it turns out, I had a new set of plugs and wires at the house that I was going to install the next day anyway, in preparation for a trip, so I nursed it home and changed the plugs and wires the next day. 2007 Mini Cooper S 1. With automotive misfires an ignition system is the first place to start looking for the misfire. com and find specs, pricing, MPG, safety data, photos, videos, reviews and local inventory. The engine starts and ticks over fine and will accelerate if throttle is opened slowly with some misfire but when throttle. I could change the plugs completely of course, but that may not cure anything and I have a hunch it will do precisely nowt. and a tick noise, lots of misfires. Plugs didnt seem to make any difference. 8-liter V-6 engine (V. Ive pulled. My ambient lights have always changed when flicking through modes green/mid/sport. Repairing an intermittent misfire or shake in the engine is easy once you see how I repair the problem In this video I will show you how to diagnose a intermittent misfire. Misfires & hesitation of this sort are caused by many factors from fuel quality, fuel & ignition systems, BPV, all those sensors that BMW put in, etc,etc Just had a long diagnostic journey w/ such. I got on the I-10 and punched the throttle at 65 - sure enough, engine misfire. A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. This article applies to the 1st Gen Mini Cooper (2001-2006). Unfortunately, when the fuel pressure regulator begins fading it can take a huge toll on the way your MINI performs. When your engine is misfiring, it can lead to vibrations, Manouchekian says. A heat-resistant composition that works for both cold starts and sudden acceleration ensures reliability. When vehicle warms up, under a load, can feel a distinctive engine misfire, and lack of power on acceleration. Shortly thereafter experienced very intermittent random misfires. 6 Cooper would be losing power? You can drive along grand at 70 then all of a sudden it will sudder and drop revs. M52 Engine Control Module Fault Code 12 Model:. Common Causes for an Engine Misfire and P0300 Code Ignition Misfire An Ignition System problem is one of the most common reasons for an engine to misfire. I explained that the misfire only took place at high speed under load. Always begin replacing the easiest and cheapest part first, which is the fuel filter. I've had my 2004 hyundai santa fe for less than a year and have been experiencing a lot of hesitations and misfires while driving and the vehicle has warmed up. Recently (over the last 2 weeks) the service engine light has been coming on with more frequency, first blinking (means emissions problem according to manual and then it will stay on solid (meaning a misfire problem) then go out for a couple seconds, then come back on blinking, then to solid, so on and so on. If fuel pressure is even a couple pounds less than the specifications, it can cause problems. A common cause of back-fire is from running rich (too much fuel going into cylinders), or faulty ignition possibly a fouled (dirty) spark plug, coil, or plug wire. If yours are original, then that could be the cause. I tried adjusting the idle valve screw and mixture, i turned them both in fully and then opened them 2 turns as i seen this was the normal setting. I bought it used and have had it for 6 months or so. This covers the seven most common problems we run across in servicing Mini Coopers. One of the more uncommon causes can be easily overlooked, and that is what we will discuss in this. The engine of a car determines how well the car performs. 3 sparks per crankshaft turn on a 6-cylinder engine and 2 sparks in 2 segments on. We put together 7 common problems we find with Mini Coopers to help you, the owner, understand what issues you may have while owning a Mini Cooper. I thought it may be a misfire but not sure. com and find specs, pricing, MPG, safety data, photos, videos, reviews and local inventory. Hesitation in acceleration, acceleration surge at both high and low speeds, delay in acceleration, etc. Rough acceleration is a typical sign of that your engine is misfiring. In this post, we will share information about one of the engine sensor named Knock Sensor. nothing different, same synthetic oil I have always used (and suggested by the dealer). This thing sometimes BREAKS IN HALF - causing a vacuum leak which makes the car run dead lean on acceleration. So obviously I let off the gas. My 2003 Mini Cooper (base) is misfiring/stumbling when idling and soemtimes when braking.