Some believe it is due to insufficient maintenance and oil changes, or to the use of 20w oils, which are too thin for the engine. I knew my Metro had a burnt valve and low compression, but I would not call that a misfire, since the fuel is burning fine, just leaking into the exhaust and delivering less power. This makes the 3.5 EB an excellent engine for towing and fun around town without requiring full use of the engines RPM range. good article but didnt cover a p0300 with misfires on all cylinders on 1 bank of a v8. Acts like it doesn't know what gear it should be in. I changed my plugs and gapped them to the .028 and replaced the boots about a month ago. Speechless. You can post now and register later. Read more: Low Fuel Pressure Symptoms, Causes (& How To Fix it). They diagnose all the pretty computer BS and forget that under all the plastic and computers and pretty engine covers theres still a spark-ignited engine. If an issue does occur, it is prudent to replace the entire timing chain assembly. TuningPro.co is owned and operated by 8020 Media. Re: 2011 f150 ecoboost misfire p0301. This will be discussed in greater detail in the upcoming discussion of common 3.5L EcoBoost engine issues. After some research, there are problems with the CAC and many of the trucks left the factory with Mis-Gapped plugs. The last number represents the cylinder that is having the misfire. Otherwise, its worth noting that turbo engines can be a little more difficult to maintain. plasticpat Time and the winter will tell. Best regards, Hi Mr. Selln I have a problem with my Opel Monza GSI fuel injection 1.6 car only revs up to 3000 then back fires and the engine light comes on we change the fuel pump but still nothing any help please, Hi I have a ford cortina 2l i fit al new parts coil carburetor sparkplugs plugwers dustubetor points condensor and suer of timming slil cant start please can somebody tell me what to do. Learn more here: How to find a Vacuum Leak & How to Fix It (8 Easy Steps). Small bore plastic vacuum lines around the back of the engine have been removed and inspected, all look fine. Ford also added port injection to the second-generation 3.5-liter V6 twin turbo engines. The main symptoms of an engine misfire include: Here is a more detailed list of the most common signs of engine misfires: When an engine misfire occurs, you may feel a strong or light jerk coming from the engine. Remove the ignition coil from that cylinder and replace it with one from a non-misfiring cylinder. Hi all, my 1.0 ecoboost has recently started to misfire or hesitate under light throttles. Remove the plug on the ignition coil of the cylinder you're working on. Manage Preferences - Anyone changed a PCM for a second hand unit, can ForScan do the setup and or reprograming? Misfire Codes: A bad timing chain tensioner or guide also causes the check engine light to illuminate. Its time consuming and the component costs can add up. If you have an account, sign in now to post with your account. Ford told me that plugs 2 and 6 are cracked and coil in number 2 needs replaced. Spark plugs for stock 3.5 EcoBoost engines will likely need to be replaced every 40,000 to 60,000 miles. Before delving into 3.5 EcoBoost problems, its necessary to establish some context. Here's my top pick motor oil for the Ford EcoBoost cyclone engine. Every engine suffers from some degree of oil blow-by. I haven't done anything with the turbo bypass valve so far assuming that at these very light throttle loads the turbo can't be contributing much if anything. He has been working as a car mechanic for over 10 years, and the majority of them specialized in advanced car diagnostics and troubleshooting. Did you fit standard OEM? Several of the most frequently encountered issues with the Ford 3.5 EcoBoost engine include the following: As mentioned previously, the top two issues primarily affect the first-generation 3.5 EcoBoost engine. Zain. Worst pressure condition in the cylinder. Faulty plugs. Regards 3. Fuel related misfires can be caused from not enough fuel. In some cases, it can also lead to dangerous situations where the car stalls and becomes difficult to steer due to the loss of power steering. If you notice that it vibrates more than usual, it could be a sign that the engine is misfiring. . Hi, Magnus i read your instructions, i own a vw tourage 2008, according to the trouble codes i got from dtc the engine has a misfire on all 6 cylinders, and random misfire, one thing that i wonder is that the engine sounds smoothly well tuned, the check engine light is on, I'm replacing the spark plugs they are dirty and according to the a page that i found in Google the gap should be. Terms of Service - Condensation in the Intercooler. The injectors are installed Under valve cover and to get to them the plenum and intake manifold needs to be removed. You can check for vacuum leaks by gently spraying a flammable spray around the engines intake manifold while the engine is idling. 3.5L EcoBoost Timing Chain Rattle Symptoms & Fixes, Ford Fuel Pump Driver Module Failure Symptoms & Solutions. If you see a blinking or flashing check engine light, thats another strong sign that your engine is misfiring. Automotive Performance, Tuning, & Modification. He shows location of low side pressure sensor (and goes through other common faults). Started February 20, By The car engine is most sensitive to small air-fuel mixture problems at idle, so this is probably one of the first places you will notice misfires. This includes misfires, power loss, and a rough idle, among other things. Try better fuel, see if it goes away. To fix engine misfires, you need to read the trouble codes from the engine control module and continue troubleshooting from there. Cookie Policy - Additionally, they address a few reliability concerns, making the Ford 3.5 twin turbo engine from the second generation even more reliable. Symptoms of a spark plug or ignition coil on the verge of failure include the following: Typically, plugs and coils exhibit the same symptoms. For example, if you see a trouble code like P0300 or P030X, it means that the ECM is detecting a misfire on a specific cylinder, and you may want to start checking the spark plug or ignition coil on that cylinder. Advertising - 00:00 / 00:00. The Ford 3.5 EB strikes an excellent balance of power, torque, towing capacity, and efficiency. If you get a 3.5L EcoBoost in your shop with misfire code(s) P0300-0306, pull the plugs and coil boots and look for . Open your hood and allow the engine to cool down. On naturally aspirated engines, spark plugs frequently last over 70,000 miles, while ignition coils typically last about twice that. The smaller twin turbochargers are quick to spool and deliver a significant amount of low- and mid-range torque. So far I filled the the tank with premium fuel and added an injector cleaner, no change after 100 miles. Castrol Edge vs. Mobil 1 Oil: Differences & Which Is Better? or my ECU ? Some of the most common causes of engine misfires are bad spark plugs or a bad ignition coil, which can be relatively cheap to repair. These misfires often occur under load from the engine, such as when you accelerate quickly. Excess carbon build-up on the 3.5 EcoBoost intake valves and ports manifests itself in the following ways: The majority of these symptoms are caused by the primary symptom misfires. Hi my name is Victor I have a 07 Pontiac Grand Prix V6 I am getting a code low sufficiency threshold have changed wires plugs coils and it runs fine and when I put it under a load start start to run rough so what clean the injectors again it runs fine until I put under load what is the problem, I replaced both coils 8 spark plugs and wires still running bad checked my ekg valve it works motor still shakes and body as well could it be a faulty fuel injector I need help. Its a simple task that almost anyone can complete in less than an hour or two in their driveway. Its my first scan tool which has been useful but is limited by my knowledge and the small screen. Additionally, engines are prone to a variety of other issues that we are not discussing particularly as they age and mileage increases. This misfiring of the Ecoboost leads to rough idling, stuttering, and fault codes. . All of these parts are often very expensive to replace, so you want to make sure you do a proper diagnosis before replacing them. Tighten the plug in the clockwise direction with the 3/8 drive ratchet to just past hand tight. Myself and many others might be happy you did, but we all would miss the joy and happiness you bring to this section All - this is a VERY WELL DOCUMENTED fatal flaw in the ecoboost. Push in the red plastic lock tab to secure the power plug. If the misfire is specific to a cylinder, it may display a check engine light and a DTC such as P0301, P0302, P0303, P0304, P0305 or P0306. I wasn't very succinct with my summarybut yes, I agree fully with Bravo and Whoand yes, when I have it to do again, I'll never own another boosted motor. Again, the method outlined above is an effective way to ascertain the source of the problem. However, you have some control over how well the twin turbo EcoBoost engine is maintained. John, thanks for your reply. I don't know what Scan Tool you are using but FORScan is your best bet for Live Data on any Ford car. Was told it might be the fuel sending unit . You can either get one yourself, or go to a mechanic and borrow their diagnostic tool to read the trouble codes from the ECM. May 9, 2021. Inject not getting fuel , so cylinder does not fire , so get misfire code. Insulation and wiring loom made good, bracket modified to keep clear, injectors refitted and all other parts. If you find trouble codes on an engine sensor or low fuel pressure, youll want to start the diagnosis from there. I hope you enjoyed this article and now have the expertise to diagnose engine problems like misfires and fix the problem with your car yourself to save some money. For the F150 I asked a Ford dealer in Minnesota to diagnose it. Under hard acceleration (i.e., boost) or at highway speeds, an intermittent stumble and misfire reportedly can occur during high humidity or damp conditions. Were the loom turns behind the engine there is a metal bracket which supports the connectors to the two oxygen sensors. Line up the bolt hole in the ignition coil assembly with the corresponding hole in the top of the engine. Simply because these issues are classified as common does not mean they affect a large percentage of 3.5 V6 engines. At 96,000 Miles. There are several misfire related trouble codes. In any case, the issue at hand is one of timing chain stretching. Additionally, issues with the 3.5 EcoBoost timing chain guides, tensioner, and cam phasers occur. So, as its intermittent and clears after 5 or 6 miles I'm continuing to drive it hoping some new clues will appear, its done about 2k miles since the last trip to the garage. I did the thottle position sensor reset procedure and that helped for about 2 days. Walnut blasting should be performed every 70,000 to 100,000 miles as preventative maintenance. Truck ran pretty good even picked up about 1.5 mpg, then the last couple of weeks it has become a tired dog. On top of this, folks have to worry about fuel in the oil, and the cold start rattle (failed cam phasers that then stretch the timing chain). Car wont move after CV Joint replacement. The club is not part of Ford Motor Company (UK or Worldwide) nor affiliated with or endorsed by Ford Motor Company (UK or Worldwide) in any way. Spark plugs should be replaced on a schedule for all car models, and not replacing them on time can cause fouled spark plugs, which can cause misfires. My caddy 1.6 carb had still misfired after changing coil, boggy cords, plugs, distributor cap, rotor and some fuel lines. With closer inspection it was clear that there was contact between the loom and the square edge of the bracket. A random misfire means is that a misfire is detected . By So, there you have it all the computers and over a 1k at the main dealer couldn't fix it, but patience, a good eye and some heat shrink and tape and it's fixed for free. Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. Joined: Thu Mar 23, 2017 6:09 pm. It is, however, inherent in owning a twin turbo, direct injected engine. Condensation can build up and be trapped in the intercooler on certain F-150 models with the 3.5L EcoBoost V6. I'd get rid of this truck if I could but the timing just isn't right. However, it is a much simpler job than changing the spark plugs. You may also consider simply replacing the spark plugs. If you do this, and change spark plugs every 30k miles, you will never have a misfire ever again. Your link has been automatically embedded. Ford 1.5 EcoBoost Engine Problems: The 4 Most Common Problems, ignition system such as spark plugs and ignition coils, 10 Best Digital Calipers In 2022 Expert Review, 10 S9 Charging Cable Of 2022 Reviews & Comparison, 10 Projectors For Laptops Of 2022 Reviews & Comparison, 10 Brother Mfc L5900dw Of 2022 Reviews & Comparison, Top 10 Porter Athletic Equipment Recommended By Editor, 10 Harry Potter Proclamation In 2022 Expert Review. The wideband front O2 sensor should show a Current of 0 most of the time under constant or no Throttle openings. If you're located in Florida especially in Hollywood, i wanna meet you so i can get my car fixed for good. If any of these are missing or incorrect, the cylinder combustion will not be done correctly, and no power will be created. Did compression test and cylinders were 150, 150, 149, 149. This has a detection period of 1000 engine . Finally, when the timing chain stretches, it can throw off the ignition timing, resulting in drivability problems. I hav tried out diff tps sensor,air flow meter,changed plugs an plug leads an checked the distributor.fuel pressure 7bar on idle.pls cn you assist. Carefully lower the new spark plug down into the well. However, finding these vacuum leaks is often quite easy and we will talk about that further down in the article. random misfire and cyl 4 misfire. My 2004 skoda octavia 1800 petrol turbo 20 valve engine is misfiring ive had it on dinostic and nothing is showing up its worse in the morning when started up struggling to tick over have you any idea what it could be please. Several Ford owners have filed a proposed class action lawsuit against the automaker alleging a vehicle defect in the EcoBoost engine causes coolant to leak into the cylinders, causing the potential for engine fires and failure, misfires, collision risk, and costly repairs.. The function of the spark plug is to ignite the air-fuel mixture in the combustion chamber, and if there is something wrong with the spark plug, it will not ignite, and a misfire will occur. Spark plugs were normal, except #1 as it was slightly oily/wet after cleaning with wire brush and reinstalling and restarting for about 10 minutes. This identifies the root cause as the Charge Air Cooler/CAC when it . A blown head gasket can cause low compression. Additionally, Ford did an excellent job with the second-generation 3.5 EcoBoost in addressing some of the issues. Apply some dielectric grease to the opening in the rubber dust boot at the bottom of the ignition coil. Starting at the PCM, centimetre by centimetre the loom was inspected for clues. Fuel related misfires can be caused from too much fuel. If the engine misfires in excess of 23% of the time (46 misfires per 200 engine revolutions) at low RPM or in excess of 5% at high RPM it will trigger the fault code under this condition. Started February 5, 2013, By Parts of the ignition system such as spark plugs and ignition coils are also a disadvantage of turbocharging. Having said that, well delve deeper into these 3.5 EcoBoost issues below. You can also open the hood of your car and watch the engine idle. Finally, when the timing chain stretches, it can throw off the ignition timing, resulting in drivability problems. Hello from Denmark .I have a Audi A6 C4 2.8 ACK engine ,somtime i lose Ignition on one cylinde,i have change the spark plugs,ignition coil and the spark plugs wires.when i pull the spark plugs wires out from the spark plug next to the one that dont work it comes back one ..and all 6 cylindre works fine .then i can take the car for a spin and the same thing happento i pull out the spark plugs wires next to the bad one ..and its on the same cylinder every time ..is it a bad injection valve ? Truck: 2011 F-150 XLT Super Crew. In fact, nuzzle 2 & 3 does not bring up any sign it is OK when removed from the plug head to the nuzzle. The most common code you will see is the P0300 code, along with a code like P030X. Additionally, turbocharged engines, such as the Ford 3.5 EcoBoost, have more components that could fail. It may stall, and not be able to start again, until you turn the ignition all the way off and back on again. If youre experiencing misfires, heres an easy way to determine whether the problem is with the spark plug or coil. To missmy06 I havent seen a positive post out of you yet and Im sure any dealership would be happy to trade in your current truck for another 06 and down and probably the finances would not change so go for it. It can also be caused by fuel-related issues such as a faulty fuel injector or a bad fuel pump. Ecoboost 1.0 - Difference Between 100Hp And 125Hp Version ? Matilda Magnetic build 2019 6.5' bed crew cab fx4 heavy tow.. Do Not Sell or Share My Personal Information. Had a slight misfire so I changed Spark Plugs and Coils. Aside from an oil extractor pump, you need a container to pour the excess oil, a clean rag, and a pair of gloves. On the 3.5 EcoBoost, some symptoms of timing chain, guide, tensioner, and cam phaser failure include the following: Rattling on cold starts is one of the more common symptoms of a timing chain problem. Its a simple and inexpensive repair. Leave a comment and inform us! 2015 ECO 3.5 Misfire-Tried everything, I think. I have a 2012 ford focus we just put a new ,used engine in it when I got it back the ck engine light was on we replaced the o2 sensor,then came the cylinder 1 misfire,changed out spark plug and coil still has the same code ??? TuningPro.co is owned and operated by 8020 Media. Ford did an excellent job updating some of the engines weak points with the second generation engine. Kinda forgot the power the 3.5 eco boost had when it was running rightat least no cops were nearby lol. Engine Control Unit (ECU) begins to misbehave . Great helpfully web site. Symptoms of 3.5L Ecoboost misfire are usually related to heavy carbon build-up on the ignition coil. RELATED: 8 Causes of Low Compression in a Car Engine (& How to Fix). So the car in now at a local garage and they are struggling as well. I bet that your actual problem is the spark plugs. If this gasket leaks, it will draw air into the combustion chamber, causing the air-fuel mixture to become too lean, and this can cause misfires. A misfiring engine can be a serious problem that should be fixed as soon as possible. This oil eventually cakes onto the intake valves as it travels through the intake tract. Remove the dipstick and place it on the clean rag to avoid contaminating dirt and debris. The carbon build-up causes uneven combustion, and it messes up the air-fuel mixture. A class-action lawsuit just filed says that the 1.5-liter, 1.6-liter, and 2.0-liter EcoBoost engines leak coolant into cylinders. Leakage and excessive fuel burn. Causes & How To Fix It. This is a repeat of a problem I had about 2 years ago which was never diagnosed but cleared itself which is always a bit unsatisfactory Initially the symptoms were very noticeable and made the car difficult to drive, then progressively improved during the 10 mile journey home and are now just annoying. Fixing a misfiring engine can sometimes be difficult without the right knowledge and tools, due to the multitude of possible causes. This contributes to the prevention of carbon build-up, which we will discuss later in this article. Thank you for your help. Due to the high turbo boost pressures, spark plugs and ignition coils are subjected to significant abuse. Still #1 misfire. Seriously you need to find a different garage. My 1997 Sebring run good , as long as I stay under 65 . This is a lot of Ford and Lincoln EcoBoost engines. Ford enhanced the component before redesigning it for the second generation 3.5L twin turbo V6. Started 4 hours ago, By Those idiots told me I needed a new charge air cleaner, intercooler, possibly new turbochargers and whatever it was would be like $3000. Any thoughts, is the fiesta 1.0 ecoboost prone to wiring loom faults, ecu faults, multiplug pin corrosion, water getting places it shouldn't? You may also notice problems such as the engine stalling at idle or an uneven idle that jumps up and down. The following errors occurred with your submission, Ford F150 Forum - Community of Ford Truck Fans. Carbon buildup, on the other hand, can result in power loss and a variety of other drivability issues. You earlier indicated that your reservoir tank was "lowering as usual" or similar to that wording without me going back and checking. less than 5-10 Deg C. The PCM was changed by the main dealer back in May, I suspect a couple of minor miss fire moments since but the jury is still out, particularly given the warm summer weather. You can do this with either a compression tester or a leak-down tester. Youll have to push down on the gray tab to get the plug to connect from the coil. Generally, the most common F150 PCM failure symptoms include: inability to connect diagnostic scan tool, check engine light illumination, rough or even no start, low gas mileage, failed emissions test, engine stalling, difficult shifting, getting PCM-related . A set of ignition coils costs between $200 and $300. Overly rich running engine. Symptoms of 2.0L EcoBoost Coolant Intrusion. Check battery terminals are properly clamped and that the earth lead between the engine and chassis is good. <>Avoid over tightening the bolt to prevent from cracking the plastic ignition coil housing. P0303 definition: Cylinder 3 misfire detected. Thus until reading your wonderful explanation, I could not figure out why my computer was calling my burnt valve a "misfire", which I think is a bit misleading of OBD2. Best regards, The plugs have been used for no more the 2k miles. Additionally, while youre in there, consider replacing a few other small items. Here is a look at (2) of the spark plugs that I removed. Although we adore the 3.5 EcoBoost, no engine is perfect. This will give you important information. Excessive carbon buildup on the 2.7 EcoBoost may result in the following symptoms: Engine misfires Ford 3.5 TT V6 Carbon Build-Up Symptoms. Has been a great explanation about the theme. Privacy Statement - Well also look at how to determine if your engine is misfiring and answer some common questions about misfires. 8. I do see codeB10EA from the positive temperature coefficient heater sometimes but have assumed that cant be related. @RichBrew has been through this already with the same symptoms as @Cmw458 and I. Don't take this lightly for too long and/or pass it off as carbon build up. Lower the ignition coil back down into the well and push it on to the top of the new spark plug. Then, you want to look for vacuum leaks and cylinder compression. Reason for update: update the vehicle model years affected and production fix date Model: Ford 2017-2020 F-150 Engine: 3.5L EcoBoost 2018-2020 Expedition Lincoln 2018-2020 Navigator Summary Make sure that the oil change did not overfill or underfill. Changed the coil packs, no improvement. Glenn hastie Additionally, the 3.5 EcoBoost may generate the P0016 fault code, which will illuminate the check engine light. Paste as plain text instead, RELATED: 5 Signs of a Bad Intake Manifold Gasket (& Replacement Cost). Reinstall the injection pump cover, the engine cover, and the oil cap. Continuing to drive with a misfiring engine can cause serious damage to your cars engine. Some F-150 owners have complained of a mysterious misfire on these engines. Powered by Invision Community, DISCLAIMER: fordownersclub.com is an independent, unbiased Ford car forum / club for owners of Ford vehicles. Many faulty 3.5 EcoBoost timing chains, on the other hand, were almost certainly replaced at some point. I took it back home since I didnt have $3000 at the time and on a gamble went down to the auto parts store and bought the tools and spark plugs to swap the plugs out. I have looked at the video and that's exactly as I would expect to find it. It does sound like it is running lean, it's strange that there are not codes all the time. If you dont know when you last changed the spark plugs, you need to check your service manual and replace them if necessary. Ford introduced the 3.5-liter EcoBoost engine in the Lincoln MKS, MKT, Ford Flex, and Taurus SHO in 2010. 3.5L EcoBoost - Cold Start Ticking/Tapping Or Rattle Type Noise - Built On Or Before 31-Oct-2019 20-2315 14 September 2020 This bulletin supersedes 20-2191. Always starts and idles perfectly, even passed its MOT. Started Wednesday at 06:15 PM, By It gains 375-450 horsepower in the majority of models. At the moment I can only comment on two of your points. It is important to start by reading the error codes to know where to start troubleshooting. Carbon deposits accumulate over time and obstruct airflow into the cylinders. Connect a compression gauge to the spark plug holes and crank the engine several times. I have a 2003 BMW 745i 7 series. 5 Best 2.0L EcoBoost Performance Upgrade Guide, technical service bulletin that can be seen here, 3.5L EcoBoost Timing Chain Rattle Symptoms & Fixes, Ford Fuel Pump Driver Module Failure Symptoms & Solutions, 2010-Present Ford S-Max, Galaxy, and Mondeo, Engine overheating (often triggering a P0217 engine code), Whistling, whining, or chirping noise coming from the engine, Engine builds no boost under acceleration. This is not a critical situation that requires immediate attention. What Are The Symptoms Of Engine Misfires? Were always looking for new content to share with other Ford Maverick truck enthusiasts. Here is a more detailed list of the most common cause of engine misfires: The most common cause of an engine misfire is a bad or failing ignition coil. If it is too high or too low, you need to inspect the components of the fuel system such as the fuel pump, fuel filter, and fuel pressure regulator. The Ford 3.5 twin turbo engine, we believe, receives above-average reliability ratings. Misfires Rough idle Stuttering / hesitation Power loss Check engine light (misfire codes) Prevent ignition coil failures We typically recommend replacing all six spark plugs or ignition coils at the same time; this is especially true if they havent been changed in a while. Low fuel pressure can be caused by a faulty fuel pressure regulator, a faulty fuel pump, or a clogged fuel filter. they then suggested that I replace all plugs and boots and get an induction flush. The 3.5 EB comes in two distinct generations, which we will discuss briefly below. Carbon deposits can result in cylinders receiving an uneven amount of air. This is why you HAVE TO DRILL the 1/16" intercooler weep hole. In my case cyl 2 4 6 8 on a dakota 4.7. However, this problem still pops up from time to time in the Ford 3.5 Ecoboost engine upgrades. In addition, the check engine light may also be on if misfires are specific to a particular cylinder. Getting good spark. After a bit of discussion we realised that my scan tool and the garage scan tool both indicated that the low range fuel pressure sensor was showing 5 volts which sounds more like open circuit than an an accurate reading. Thx, My toyota vitz 2nz engine still misfiring even after puting new plugs wat can b the problem. On the 2.7L EcoBoost expect to replace spark plugs at around 40,000 to 60,000 miles. First check all ground connections are clean and tight. I just realized that 1999 toyota Camry is running on 3 cylinder By reading your article I'm without any doubt that you're a professional. Carbon tracking is where the spark fires between the top of the plug and the base, across the ceramic shell. But how do you tell if your engine is misfiring, and what could be causing it? As mentioned above, the ECM controls the engine timing, and air/fuel ratio. V8 engines have a completely different tone than a four-cylinder engine, for example. Start the engine and listen closely for any strange sounds that might indicate a problem such as a loose spark plug or a disconnected electrical connector. The most common car sensors that cause an incorrect air-fuel mixture are the MAF sensor, the MAP sensor, the oxygen sensor, and the coolant temperature sensor. Its critical to establish this for a reason. There is a red locking tab on the plug: (Heres How To Fix it), 7 Best Spark Plugs Review & Buyers Guide, Car Losing Power When Accelerating? The most common cause of an engine misfire is a bad or failing ignition coil. I have had it in several times, with no results. Misfires Are More Common Than You'd Think. The engine hesitation misfire symptoms are very mild at the moment and only occur while the engine is warming from a cold start, say 1 to 3 miles after start at about 50mph and on light cruising throttles.
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