ecoboost misfire symptoms

SMaxJohnni Once the carbon deposits become excessive, walnut blasting the intake ports may be necessary. Fortunately, checking the fuel pressure in your car is fairly easy with a manual fuel pressure gauge, and worth doing if you suspect low fuel pressure. Shops frequently charge between $400 and $600 for this service, so its not exactly inexpensive. I had a hard time describing what it was, but now this is the clearest description of . UPDATED: I have had an issue since I purchased the truck 10 months ago. This assists in removing oil deposits and preventing them from accumulating. Simply because these issues are classified as common does not mean they affect a large percentage of 3.5 V6 engines. Hearing some funny sound underneath the engine. In my case cyl 2 4 6 8 on a dakota 4.7. Certain DI engines can even run their entire lives without any valve cleaning. 4. Once at normal operating temperature the car drives perfectly with both fuel trims very close to zero, although there is a power dip flat spot at full throttle 5500rpm which is odd, e.g. If youre running a tune, making mods, or driving the 3.5 EcoBoost hard, the lifespan of the ignition components can be significantly reduced. Paul 56 . Ford 2.7 EcoBoost Now Problematic. Check battery terminals are properly clamped and that the earth lead between the engine and chassis is good. If you cant find the issue elsewhere, its definitely worth taking a look at your fuel injectors. Additionally, timing chain issues appear to be more prevalent on F-150 models than on others. Key Points. Push in the red plastic lock tab to secure the power plug. if everything is working correctly. I wouldnt have thought a UK dealer would make the same mistake but Im almost sure they did. More often than not, your engines computer will be able to detect bad spark plugs in your F150. Changed the crank sensor the other day as a precaution as the last two cars I have owned have needed crank sensors in mid to later life. With a false high fuel pressure this leads to lean running and the fuel trim controls ramp up to compensate. SMax auto is slow to shift down to 1st gear. The fuel injectors supply the combustion chamber with the correct amount of fuel for each cylinder, and there is usually a separate fuel injector for each cylinder. The fuel idea has crossed my mind, the car is usually filled with regular supermarket fuel, however, on this occasion I had just filled up with fuel from one of the major UK fuel and oil brands, still regular unleaded E10. The upstream O2 sensor, HP fuel pump and fuel rail pressure sensor have been changed. Ford has also issued bulletins, indicating that they are fully aware of the timing chain issues. The dip is so fast the computed pressure in kPa doesn't mirror the raw voltage, but both their trends look noisy. The engine from the second generation is used in the following models: With that background information out of the way, lets get to the point. Is Fords 3.5-liter EcoBoost engine dependable? Glad you found something that works. Manage Preferences - Started Thursday at 09:49 AM, By Ignition coils have a life expectancy of 25,000 miles if were lucky. The garage thinks its running lean at light throttles as the fuel trim values are going high, hence the misfire or hesitation. If the timing chain completely fails, additional damage to the 3.5 EcoBoost engines is possible. If you already checked the fuel supply and the spark and couldnt find any problems with it, there is a risk of low compression in your engine. With the hood popped, standing in front of the vehicle, looking at the engine the cylinder numbering starts at the front left (passenger . Fuel Injectors Can Get Clogged. On the 2.7L EcoBoost expect to replace spark plugs at around 40,000 to 60,000 miles. The last number represents the cylinder that is having the misfire. 2. No PCM codes so I'm using the car to see if anything changes or codes appear. Like you I thought spark plugs and changed them early on but sadly no improvement. This can lead to a variety of engine performance issues and can even lead to serious engine damage if left untreated. Get at least 20% off selected Ford parts on eBay View parts on eBay now! 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. Fuel related misfires can be caused from bad fuel. 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. If you suspect that your engine is misfiring, it is important to take care of the problem as soon as possible. Replacing the timing chain and other critical components is not a simple or inexpensive task. [FIXED] 2011 f-150 3.5l GTDI misfire under load was created by ptebo1. Ford had a PCM reflash for these cars after the first few model years for the computer as to not trip a code on cold start misfires. Of course, the reliability of each 3.5 V6 engine is partially determined by luck of the draw. 2: What fuel are you using? 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. Pretty common to have a misfire on these motors on cold start. Pennzoil vs. Mobil 1 Oil: Differences & Which Is Better? Is normal that engines sound smoothly when there's misfiring in all cylinders? Then, clear the codes and drive for a while to see if the problem has moved to another cylinder. Its a simple task that almost anyone can complete in less than an hour or two in their driveway. Specific information about the Ford 3.5 timing chain problems is scarce. Low fuel pressure is another thing that can cause misfires. Started 8 hours ago, By Here are the 6 failures and what to look for. Then, you want to look for vacuum leaks and cylinder compression. Copyright text 2021 by driveceladon.com. 6 Symptoms of a Bad Ignition Coil (& Replacement Cost), 5 Signs of a Bad Intake Manifold Gasket (& Replacement Cost), Low Fuel Pressure Symptoms, Causes (& How To Fix it), 8 Symptoms of a Bad Fuel Injector (& Replacement Cost), 8 Causes of Low Compression in a Car Engine (& How to Fix), How to find a Vacuum Leak & How to Fix It (8 Easy Steps), Car Jerking When Accelerating? When I first purchased the fuel mileage was horrible but my smiles per mile was up, now the best Ive seen from the lie-o-meter was 19mpg on the highway and heck I still smiled.WTH..lol. The most common signs of bad ignition coils in Ford F-150 are engine hesitation when accelerating or loss of power, rough idle, misfires, excessive fuel consumption, check engine light illuminates, and sometimes hard starting. Misfires Rough idle Stuttering / hesitation Power loss Check engine light (misfire codes) Prevent ignition coil failures However, it depends on how serious the fault is and what specific repairs need to be made. We used Mitchell 1 to look up the information for setting a P0300. If your car engine is misfiring, it is important to find out the cause and fix it as soon as possible. Although mostly reliable, a Ford 2.7 EcoBoost engine has problems including carbon build-up, oil pan leaks, and spark plug and ignition coil issues. Ford told me that plugs 2 and 6 are cracked and coil in number 2 needs replaced. The engine control module monitors the crankshaft rotation speed with the crankshaft position sensor, and if the speed does not increase slightly on a cylinder after the combustion, it means that the engine is misfiring, and a trouble code will be stored. Even if the repair is not covered under warranty, you may be able to negotiate a discount or other form of compensation with Ford. Its my first scan tool which has been useful but is limited by my knowledge and the small screen. Carbon build-up is primarily an issue with first-generation engines. what could be the cause of car engine running and stopping on the road? What else can I do??? 27 Jan 2018 00:24 - 28 Jan 2018 10:44 #17294. At the moment I can only comment on two of your points. It can also seriously damage your engine. The lawsuit alleges that the leaking of . There is a red locking tab on the plug: Slide the red tab back to unlock the plug. However, because carbon build-up occurs over time, it is frequently difficult to detect. As fuel poor pressure measurement and control was one of the key symptoms this was almost certainly the smoking gun. Labor should cost less than $100. The most common situation where you will feel misfires is in high gear, low RPM, and with the gas pedal to the floor. Apply some dielectric grease to the opening in the rubber dust boot at the bottom of the ignition coil. Started 14 hours ago, By Remove the dipstick and place it on the clean rag to avoid contaminating dirt and debris. Remove the engine oil filler cap, and remove the plastic engine cover by lifting up and pulling forward. Additionally, turbocharged engines, such as the Ford 3.5 EcoBoost, have more components that could fail. P0303 definition: Cylinder 3 misfire detected. 5. Rotate the ignition coil back and forth a few times to help spread the dielectric grease. The updates aid in the support of increased power and torque. Cookie Policy - 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. 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. Started Wednesday at 06:15 PM, By In worst case scenario, if the ignition coils are in really bad condition, the engine will not start. It is not recommended to drive your car at all with a misfiring car engine. There is a gasket located between the cylinder head and the intake manifold called the intake manifold gasket. Speechless. You can post now and register later. laumk7 Cookie Policy - Advertising - Woww wow wow great article! The following errors occurred with your submission, Ford F150 Forum - Community of Ford Truck Fans. Had the DTC read as P0301 (#1 cylinder misfire) and went to my local Ford dealer, bringing a copy of Ford TSB 12-10-19. RyanP2023 The worst condition of exhaust and converters. Try better fuel, see if it goes away. At this point I decided to just change the spark plugs. If your vehicle idles roughly, stalls frequently, has a drop in engine power, stumbles frequently, has reduced gas mileage, or accelerates slowly, these are all signs your camshaft position sensor could be failing. Drop In Engine Power: . Puzzled. I have a different engine to your one but for comparison my Low side pressure is normally around 400-450 Kpa. Were always looking for new content to share with other Ford Maverick truck enthusiasts. This is not to say that the first generation engine is a bad engine by any means. This makes the 3.5 EB an excellent engine for towing and fun around town without requiring full use of the engines RPM range. I am having same issue. Two of the issues listed above may not even be considered issues. I would start with checking for any leaks around the intake and connect a fuel pressure gauge if possible! Every 10,000 miles, our twin turbocharged 335i with the N54 engine requires new spark plugs. Type B detects a condition that is progressing over time. With closer inspection it was clear that there was contact between the loom and the square edge of the bracket. If the misfire persists after installing the new cylinder, youve identified the source of the problem. If your VVT solenoid is experiencing issue due to a faulty oil control valve, you may notice a reduction in engine performance, as the VVT system may not be able to optimize the engine for peak power generation. Having said that, well delve deeper into these 3.5 EcoBoost issues below. in both cases, the engines were significantly under the mileage recommendation to replace the spark plugs. The smaller twin turbochargers are quick to spool and deliver a significant amount of low- and mid-range torque. Upload or insert images from URL. Turbos lead to high cylinder pressures, which in return stress the entire ignition. Ford 2.7 EcoBoost Spark Plug & Ignition Coil Symptoms. Slide the electrical connector straight back into the socket until it clicks securely into place. Posts: 3. If you find trouble codes on an engine sensor or low fuel pressure, youll want to start the diagnosis from there. Each of the wires on the HP fuel rail sensor were back probed in turn and with the multi meter set to ohms the loom damage area was probed with the other lead. or my ECU ? Carbon build-up is simply a disadvantage of relying solely on direct injection. In any case, the issue at hand is one of timing chain stretching. Avoid over tightening the new spark plugs to prevent from stripping the aluminum threads. Remove the insulated cover over the injection pump to get to spark plugs # 5, and #6. Driving with a misfiring engine may not be dangerous right away, but over time it will wear on your engine and you can potentially damage the vehicle. If you "tune" this engine expect to replace spark plugs every 10,000 miles. srpocd25 Therefore, if you have checked the basics, it may be worth taking your car to a qualified mechanic for expert advice. This has been done since 2011 to get these 3.5 ecoboosts to work better. The plugs were changed at 40k as I was aware of a slight hesitation back then, no improvement, the car is at just under 50k now. Started February 5, 2013, By 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. Can a cam sensor make it miss fire on one cyl. Thx, My toyota vitz 2nz engine still misfiring even after puting new plugs wat can b the problem. RELATED: 5 Signs of a Bad Intake Manifold Gasket (& Replacement Cost). He shows location of low side pressure sensor (and goes through other common faults). Although the engine appears the same on my car there is no sensor on the low-pressure side fitted. 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. Re: 2011 f150 ecoboost misfire p0301. . I have a 2014 chrysler town and country van 3.6 engine number 3 cylinder misfire changed coils, spark plugs ,fuel injectors compression 130 # wires good to and from injectors good,ohlms across injectors,air filter good, intake gasket good added heat to gas tank. 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. i have hyundai accent 2012 model ,manual gear.my car RPM fluctuates even after i changed my coils ( 3 coils are good and one coil current was leaking so i changed only that coil),plug ,air filter etc.kindly suggest what is the remedy for this problem. 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). The next thing you want to check is the fuel pressure. 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. Since the 3.5L Ecoboost in my Expedition has 79,000 miles on the original spark plugs, I decided to replace all (6) spark plugs with new ones. I've pulled the injectors and sent them for cleaning and testing, will report back results. Again, the 3.5 EcoBoost is an extremely reliable engine in general. The advantage of port injection is that fuel is washed over the intake ports and valves. There arent many issues that frequently occur with these engines. The problem is variable and intermittent but looks to be the same using both the original and a spare fuel rail pressure sensor. Declan19971 The plugs have been used for no more the 2k miles. Damaged injecting tools. Before delving into 3.5 EcoBoost problems, its necessary to establish some context. Smoke Can Indicate Danger For You. 3.5L EcoBoost Timing Chain Rattle Symptoms & Fixes, Ford Fuel Pump Driver Module Failure Symptoms & Solutions. 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. Need some advice here, I have a 2015 F150 3.5 Ecoboost. pretty much the same story with the Escape (Kuga 2 US version with 2.0 TT eco boost) except I went straight to the plugs without paying a dealer $100 to diagnose it. The Ford 3.5 twin turbo engine, we believe, receives above-average reliability ratings. Im not sure whats going on but whenever I try to drive it Ill put it in drive and it will start to go and when you give it gas it will accelerate for a second then rev high like it shifted into neutral then shift and it will repeat that same cycle until the car switches into failsafe mode.. any advice on where to start? Remove the bolt that holds the coil pack in place with a 8mm (5/16) socket. But with all the added power I'm experiencing, as well as the renewed tranny response, I have to figure that will all carry over to making towing easier. 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. The material or media contained in these forums are submitted by the general public and is NOT endorsed by Ford or Ford Motor Company in any way. Some mechanics prefer to use anti-seize lubricant grease on the threads, but most spark plug manufacturers do not recommend using anti-seize since it can easily lead to over tightening. You cannot paste images directly. More precisely, it appears to affect primarily 3.5 EcoBoost engines manufactured between 2010 and 2014. The misfire can come or go depending on what is going on with the ECM. An engine misfire is an event that occurs when one or more of the engines cylinders fail to ignite the air/fuel mixture during the combustion cycle. cheaper than replacing the valve? 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. It suddenly lost power like it wasnt running on all 6-cylinders, and the check engine light was blinking. You can also open the hood of your car and watch the engine idle. Additionally, Ford redesigned the timing chain in response to concerns about the previous designs reliability. The most common causes of engine misfires are bad ignition coils or failed spark plugs. Worst pressure condition in the cylinder. Update, still not fixed, Ford Main dealer have discussed with Ford UKand both are unable to offer a diagnosis with any confidence. Anyone changed a PCM for a second hand unit, can ForScan do the setup and or reprograming? 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. If your engine misfires, it will feel like the engine is shaking or vibrating, and it may make a knocking noise. If the engine speed increases, it means there is a leak and the engine is injecting the flammable spray. I thought it was misfiring or driveline related. The wideband front O2 sensor should show a Current of 0 most of the time under constant or no Throttle openings. However, this problem still pops up from time to time in the Ford 3.5 Ecoboost engine upgrades. jsk Started 2 hours ago, By (6) Motorcraft SP-580 (CYFS-12-YT4) spark plugs. Its time consuming and the component costs can add up. Ford did an excellent job updating the second generation 3.5 EcoBoost engine. Hello allhopefully I'm not regurgitating info herebut since my searches led me to different bits and pieces of my solution, I figured someone else might benefit from it all being condensed into one place. I am debating on whether to go with another oem turbo or get an aftermarket higher performance turbo. I have a 2003 BMW 745i 7 series. Checked all the ground connections I could find, they all looked good. 165k miles #1 cyl misfire code. 00:00 / 00:00. When the engine control module receives the data, it will determine if the problem is serious or not. I've been on other websites trying to find more info on what to do on my VW caddy 1988 model which I'm experiencing misfiring. Yeah the misfire is only on cylinder 4 according to the AP and about 2 weeks ago it began. Most likely, you will be unaware of a gradual loss of power over a period of several years. Make sure that the oil change did not overfill or underfill. When one or more cylinders do not fire properly, the engine will become unbalanced, and this can cause severe vibrations inside your car when accelerating or idling. . Here we will look at what you need to know about engine misfires. 1. To protect yourself, here are the tried and true methods: Remember, the root cause of ecoboost misfire is the condensate buildup from the intercooler. Privacy Statement - This video may help. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates. What Happens When You Put Too Much Oil in Your Car? I used a small screwdriver to press down on it as I slid the plug off. My Toyota corolla 2009 cylinder 2 & 3 is misfiring. New plugs areNGK Spark Plug SILZNAR8C7H (93593) same NGK part number as the originals. If your car's check engine lights come on and stay on, more than likely the camshaft sensor is bad. Compare the results with the manufacturers specifications, and if the compression is low on a cylinder, you need to inspect the engine parts such as the timing belt, piston rings, valves, or pistons. I changed my plugs and gapped them to the .028 and replaced the boots about a month ago. Additionally, while youre in there, consider replacing a few other small items. 2.7 EcoBoost stumble on highway acceleration. For the F150 I asked a Ford dealer in Minnesota to diagnose it. You can expect a cost of $200 to $500 to fix a misfiring engine in most cases. Tom Harbid. It may stall, and not be able to start again, until you turn the ignition all the way off and back on again. Additionally, the 3.5 EcoBoost may generate the P0016 fault code, which will illuminate the check engine light. This will be discussed in greater detail in the upcoming discussion of common 3.5L EcoBoost engine issues. You may also consider simply replacing the spark plugs. If your vehicle is no longer under warranty and you experience timing chain issues, you may be able to work with Ford. OK ForScan up an running and after much testing I can see the fuel rail pressure sensor raw voltage signal intermittently dropping to zero volts for a few mili-seconds then recovering. My 1997 Sebring run good , as long as I stay under 65 . Additionally, direct injection causes carbon deposits on the intake valves, which can cause drivability issues. Condensation in the Intercooler. Learn more here: How to find a Vacuum Leak & How to Fix It (8 Easy Steps). Additionally, Ford did an excellent job with the second-generation 3.5 EcoBoost in addressing some of the issues. Carbon buildup, on the other hand, can result in power loss and a variety of other drivability issues. However, numerous other factors can cause rattle. Failed injectors arent very common on most modern car models, and because of this, youll want to check out the other possible causes first. 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. Hi Iam driving corsa 1.6 gsi 2002 model, the engine it's got hard start and badly sound idling, need to be rev for idling, when I leave rev cable, the engine loose the idling gose off, again on the spark plugs no1 and no2 there's spark but doesn't ignit the fuel mixer, I don't know what's problem. Therefore, if you notice that your car engine idles rougher than usual, it could be a sign of a misfiring engine. The garage needs some thinking time so they haven't physically worked on it in the last few days, I need to chase for updates. This identifies the root cause as the Charge Air Cooler/CAC when it . Change the oil on time, use high-quality oils, and address issues as they arise. There is a Technical Service Bulletin (TSB 14-0180) for the 2011-2013 Ford F-150 that suggests that you check the spark plugs for carbon tracks, and replace the plugs and boots if carbon tracks are found. Is there any cheap way to improve compression or get rid of the code? I have a golf 6 TSI model 2010, I changed new spark plugs, ignition coil and spark plugs cables but the car still misfires at times but not always. If you lose power while driving on a busy road, this is a safety hazard. I would like to congratulate you on the simple way of explaining this article on misfire troubleshooting. If a sensor is failing or a sensor detects that something is wrong with the engine, it sends the information to the engine control module. The 3.5 EB comes in two distinct generations, which we will discuss briefly below. Carbon deposits should not pose a serious threat to the 3.5 EcoBoosts longevity. Long story short I took my vehicle to a ford dealership over a check engine light and very low power and was told that the turbo was the culprit and needs replacing. For complete cylinder combustion to occur, the engine needs three important things, and that is the correct air/fuel mixture, compression, and spark. General discussion on 2009 - 2014 Ford F150 truck. Great helpfully web site. Started February 26, By The Ford 3.5L EcoBoost engine can power several models, including the Ford F-150 and the Lincoln Navigator. My caddy 1.6 carb had still misfired after changing coil, boggy cords, plugs, distributor cap, rotor and some fuel lines. Nonetheless, turbo technology has advanced significantly over the last few decades. Ford 1.6 Inline-4 Timing Belt Change. . Vehicle does not drive like it used to. TuningPro.co is owned and operated by 8020 Media. Continuing to drive with a misfiring engine can cause serious damage to your cars engine. Its plastic, so you dont want to pry on it or you may break it. when overtaking. I bet that your actual problem is the spark plugs. Issue Severity: SEVERE - Stop driving immediately. Turbo engines do require some additional maintenance, but we believe it is worthwhile in the long run. These are the most common symptoms of 2.0L EcoBoost coolant intrusion, but not all of them. but I don't feel or hear any misses . The 3.5 EcoBoost engine from the first generation utilizes only direct injection (DI), which means fuel is sprayed directly into the cylinders. Its a powerful engine with 355 to 647 hp and plenty of torque. Ryan jones Started February 20, By Ford did an excellent job of addressing these issues once they became aware of them. driveceladon.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The second most common cause of a misfiring engine is bad or failing spark plugs. As we talked about earlier, the engine needs the right air-fuel mixture, spark, and compression to fire properly. 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 . by Aungsty Thu Mar 23, 2017 6:38 pm. Also make sure that the correct viscosity of oil was put in as the wrong "weight" of oil can make the VVT malfunction. As a result, spark plugs and ignition coils start bringing issues. Best regards, Hi Mr. Selln Its not recommended to drive with engine misfires. Received 31 Likes on 28 Posts. How Much Does It Cost to Fix Engine Misfires? Therefore, if your 4-cylinder engine misfires on one cylinder, it will sound like a 3-cylinder engine. As a result, the cylinders of the 2.7 EcoBoost may experience inconsistent air delivery due to restricted airflow. Faulty coils and broken electric wires. Hesitation everytime I get into the throttle. Connect a fuel pressure gauge to the fuel rail and start the engine. Regards Leave a comment and inform us! Regardless, we would want to complete the job. December 3, 2020 Ford EcoBoost problems have caused a class action lawsuit that alleges 1.5-liter, 1.6-liter and 2-liter EcoBoost engines allow coolant to leak into the cylinders. In order to get to the #5 and #6 spark plug, youll have to unplug the harness connector on the injection pump. Additionally, engines are prone to a variety of other issues that we are not discussing particularly as they age and mileage increases. Is this possible ? Even if you think it will be very expensive to take the car to a mechanic, it can actually sometimes be cheaper to get a proper diagnosis rather than replacing fully functional parts. @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. Carbon tracking is where the spark fires between the top of the plug and the base, across the ceramic shell.

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