Otherwise, its worth noting that turbo engines can be a little more difficult to maintain. Started February 20, By Save my name, email, and website in this browser for the next time I comment. The engine misfires, resulting in rough idling, stuttering, and fault codes. However, Ford pioneered the use of turbochargers, direct injection, and variable valve timing. P0300 - this trouble code indicates that there is a random misfire. Yes I agree. Timing chain replacement is likely to cost in the thousands of dollars range. The most common cause of an engine misfire is a bad or failing ignition coil. As for these Ford 3.5 EcoBoost, problems result from the engine using a direct injection fuel system and being twin turbo. 9. Check light blinking, car acceleration slow. Remove the plug on the ignition coil of the cylinder you're working on. 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. The plugs have been used for no more the 2k miles. Misfires Rough idle Stuttering / hesitation Power loss Check engine light (misfire codes) Prevent ignition coil failures Kinda forgot the power the 3.5 eco boost had when it was running rightat least no cops were nearby lol. 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. You can also use an EVAP smoke machine to easily find vacuum leaks, but these are often quite expensive and probably not something most people have in their garages. Hesitation everytime I get into the throttle. Additionally, while youre in there, consider replacing a few other small items. 1. 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 . If your engine is misfiring, it's important to determine the cause as soon as possible. If youre unlucky, it could be due to poor compression, which can be very expensive to repair. The most common causes of engine misfires are bad ignition coils or failed spark plugs. If the fuel injector injects the wrong amount of fuel, it will cause the engine to run rich or lean, which can lead to engine misfires. The 3.5 EcoBoost engine from the first generation utilizes only direct injection (DI), which means fuel is sprayed directly into the cylinders. You cannot paste images directly. To the OP glad your running top notch, and here I thought this was going to be positive threadthat was short livedlol. If your engine misfires, it will feel like the engine is shaking or vibrating, and it may make a knocking noise. Ford did an excellent job of addressing these issues once they became aware of them. 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. Slide the electrical connector straight back into the socket until it clicks securely into place. Remove the bolt that holds the coil pack in place with a 8mm (5/16) socket. Misfire Codes: A bad timing chain tensioner or guide also causes the check engine light to illuminate. if everything is working correctly. What Are The Symptoms Of Engine Misfires? As a result, the cylinders of the 2.7 EcoBoost may experience inconsistent air delivery due to restricted airflow. OEM COILS - Keep in mind no check engine light just a slight miss under light loads and typically above 60MPH (1200-1500 RPM) Didn't solve the problem, re did the process . Labor should cost less than $100. If I need to take the car back as is I will invest in the FORScan system suggested above. It also causes the plug to misfire. Started February 26, 2015, By Any no improvement. Started February 26, By My Toyota corolla 2009 cylinder 2 & 3 is misfiring. Ryan jones Most likely not your air filter. The dielectric grease will help seal out any moisture, dust or debris and ensure a reliable electrical connection. The majority of 3.5L V6 EcoBoost engines should have no significant issues reaching 200,000 miles or beyond. 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 ? Ford enhanced the component before redesigning it for the second generation 3.5L twin turbo V6. This has a detection period of 1000 engine . RELATED: 8 Causes of Low Compression in a Car Engine (& How to Fix). Its best to diagnose and repair the issue as soon as possible. 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. If you see a blinking or flashing check engine light, thats another strong sign that your engine is misfiring. The car has run perfectly all summer but in the last couple of weeks the fault is back. Started Wednesday at 03:50 PM, Ford Owners Club Another possible problem that can cause misfire fault codes on only one side is low compression. Even if the repair is not covered under warranty, you may be able to negotiate a discount or other form of compensation with Ford. Verified plugs and wires by swapping #1 with #3. In this video we show you how easy it can be to diagnose a misfire on a modern engine with the right tools.Latest Ford Parts:Ignition Coil (2011-2016)-https:. Specific information about the Ford 3.5 timing chain problems is scarce. 5. Clear editor. Many faulty 3.5 EcoBoost timing chains, on the other hand, were almost certainly replaced at some point. This is why you HAVE TO DRILL the 1/16" intercooler weep hole. The numbering of the cylinders on a Ford F150 starts from cylinder 1 on the front and goes backward. [FIXED] 2011 f-150 3.5l GTDI misfire under load was created by ptebo1. Code says multiple misfire's . Your previous content has been restored. 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. Failure of any of these sensors can cause an incorrect air-fuel mixture to enter the engine, which can cause the engine to misfire. P0445 Code Meaning, Causes, Symptoms (& How to Fix it), 7 Reasons Your Engine Is Running Rich and How To Fix It, Car's Engine Burning Oil? . He shows location of low side pressure sensor (and goes through other common faults). I bet that your actual problem is the spark plugs. This is why you HAVE TO DRILL the 1/16" intercooler weep hole. John, thanks for your reply. Although most modern cars use an electric fuel pressure sensor, youll want to confirm the results with a manual fuel pressure gauge, because an electronic sensor can fail. In many ways, its the best of both worlds, as DI has numerous advantages over PI. This after they told me that the dealer and ford engineering thought it was a bad fuel injector . Again, be careful that you dont apply to much force and break the plug. Also make sure that the correct viscosity of oil was put in as the wrong "weight" of oil can make the VVT malfunction. Hi guys The car is my daily driver and I'm not necessarily looking for an . Hi all, my 1.0 ecoboost has recently started to misfire or hesitate under light throttles. 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. To be honest, this is mostly here because weve run out of other topics to discuss regarding the 3.5 EcoBoost. You can either get one yourself, or go to a mechanic and borrow their diagnostic tool to read the trouble codes from the ECM. Under hard acceleration (i.e., boost) or at highway speeds, an intermittent stumble and misfire reportedly can occur during high humidity or damp conditions. As mentioned above, the ECM controls the engine timing, and air/fuel ratio. Although we adore the 3.5 EcoBoost, no engine is perfect. Low Engine Compression. Ford told me that plugs 2 and 6 are cracked and coil in number 2 needs replaced. This video may help. Modern cars have good monitoring systems for all the different car sensors on the engine. Bad Ignition Coil. An engine with a bad ECM will often run rough and misfire. 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. New plugs areNGK Spark Plug SILZNAR8C7H (93593) same NGK part number as the originals. With the ignition coil out, you can remove the spark plug using a 5/8-inch spark plug socket, extension, and ratchet. On naturally aspirated engines, spark plugs frequently last over 70,000 miles, while ignition coils typically last about twice that. You may also consider simply replacing the spark plugs. Hearing some funny sound underneath the engine. The official Ford website can be found at http://www.ford.co.uk/, Fiesta 2013 1.0 Ecoboost misfire and or hesitation under light throttle. When I got home I scanned the truck for trouble codes, and discovered these codes: P0300 (Random/Multiple Cylinder Misfire Detected). 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. You earlier indicated that your reservoir tank was "lowering as usual" or similar to that wording without me going back and checking. Started February 9, By Engine Control Unit (ECU) begins to misbehave . Unfortunately, low compression problems are often caused by worn parts inside the engine, which can be very expensive to fix, so youll want to inspect the other possible causes first. While timing chain issues are unlikely to be as prevalent as some may believe, they are something prospective owners should be aware of. If you cant find the issue elsewhere, its definitely worth taking a look at your fuel injectors. Clues so far is that it doesn't like colder temperatures e.g. 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. Engine misfires can actually be quite difficult to diagnose even for us experts in the field. There arent many issues that frequently occur with these engines. 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. SMax auto is slow to shift down to 1st gear. It is one of the variables over which we have no control. Glenn hastie Having said that, well delve deeper into these 3.5 EcoBoost issues below. 1. Vacuum leaks are a common cause of an incorrect air-fuel mixture and are fairly easy to check, so you want to start there. 2015 ECO 3.5 Misfire-Tried everything, I think. I would like to congratulate you on the simple way of explaining this article on misfire troubleshooting. My guide has information on the top 9 most common F150 PCM problems and their symptoms. Naturally, that engine receives some upgrades over the standard 3.5 EcoBoost to accommodate the increased power. Symptoms of 2.0L EcoBoost Coolant Intrusion. Misfires can cause all sorts of problems, from reduced fuel efficiency to complete engine failure. The updates aid in the support of increased power and torque. However, you have some control over how well the twin turbo EcoBoost engine is maintained. General discussion on 2009 - 2014 Ford F150 truck. 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. The second most common cause of a misfiring engine is bad or failing spark plugs. RyanP2023 This happens fairly quickly, say 5 seconds per event and maybe 5 events during a warm up cycle. So the car in now at a local garage and they are struggling as well. The wideband front O2 sensor should show a Current of 0 most of the time under constant or no Throttle openings. Upload or insert images from URL. Before we begin, lets jot down a few quick notes. If you think you may have a problem with engine misfires, the best thing to do is take it to a mechanic to have it checked out. When an engine misfires, it can cause reduced fuel economy, engine damage, and a loss of power. 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. 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. Getting good spark. 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. I need some direction with this one. 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 problem is variable and intermittent but looks to be the same using both the original and a spare fuel rail pressure sensor. The most common code you will see is the P0300 code, along with a code like P030X. However, using PI has a few additional benefits, most notably assisting in the prevention of carbon build-up. Insulation and wiring loom made good, bracket modified to keep clear, injectors refitted and all other parts. plasticpat To determine if you have low compression, remove the spark plugs. Contact Us - 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. If the check engine light is on, there should be a trouble code stored that needs to be checked with an OBD2 scanner. 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 . The 3.5 liter twin turbo V6 engine was then integrated into a variety of other Ford and Lincoln models over the next few years. The worst condition of exhaust and converters. Ford addressed this issue with the second-generation 3.5 EcoBoost by utilizing both direct and port injection. 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. Thank you for your help. Speechless. You can post now and register later. Please register or login to enable Dark Mode. 165k miles #1 cyl misfire code. Faulty plugs. This is what causes the misfire. However right now this is what I've got since I wanted to spend $20k not $35k. If you have a misfire trouble code on a specific cylinder, youll want to start by looking at the spark plugs and ignition coil on that cylinder. We used Mitchell 1 to look up the information for setting a P0300. Walnut blasting should be performed every 70,000 to 100,000 miles as preventative maintenance. Aug 11, 2020. . 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. 8. If you find trouble codes on an engine sensor or low fuel pressure, youll want to start the diagnosis from there. data shows primarily cylinder five misfiring. Again, the method outlined above is an effective way to ascertain the source of the problem. To refer to spark plugs and ignition coils as a issue is probably not accurate. If your Scan Tool can give you access to Mode 6 Data then there may be some clues there. Glad you found something that works. Is there any cheap way to improve compression or get rid of the code? If you do this, and change spark plugs every 30k miles, you will never have a misfire ever again. Received 31 Likes on 28 Posts. Another subject well delve into. Misfires Are More Common Than You'd Think. Only history I have is the truck has had all six ignition coils replaced . Additionally, engines are prone to a variety of other issues that we are not discussing particularly as they age and mileage increases. The advantage of port injection is that fuel is washed over the intake ports and valves. By understanding the causes, symptoms, and how to fix it, you can keep your car running smoothly and avoid expensive repair costs. You may or may not be able to monitor High and Low side Fuel Pressure readings, actual and desired. Additionally, the 3.5 EcoBoost may generate the P0016 fault code, which will illuminate the check engine light. NQbbe These are typically urgent issues that should be addressed immediately. In my case cyl 2 4 6 8 on a dakota 4.7. Its my first scan tool which has been useful but is limited by my knowledge and the small screen. If you get a vehicle in that is not generating enough boost, don't automatically assume it is the . Any ideas out there? Here is a look at (2) of the spark plugs that I removed. If you know a little about cars, youve probably noticed a difference in sounds from different engines. Finally, when the timing chain stretches, it can throw off the ignition timing, resulting in drivability problems. MAF and air filter look to be clean and dry. In fact, nuzzle 2 & 3 does not bring up any sign it is OK when removed from the plug head to the nuzzle. These cars are prone to misfires if the variable valve timing is malfunctioning. Remove the engine oil filler cap, and remove the plastic engine cover by lifting up and pulling forward. Truck ran pretty good even picked up about 1.5 mpg, then the last couple of weeks it has become a tired dog. Car wont move after CV Joint replacement. I finally adjusted the float screw anti clock wise and my problem was solved. Has been a great explanation about the theme. This leaves a characteristic carbon track on the insulator. If your car engine is misfiring, it is important to find out the cause and fix it as soon as possible. Although the engine appears the same on my car there is no sensor on the low-pressure side fitted. Identifying these issues can be a little hard. Woww wow wow great article! Push in the red plastic lock tab to secure the power plug. Tighten the bolt in the clockwise direction with the 8mm socket and a 1/4 drive ratchet until it is snug. However, because carbon build-up occurs over time, it is frequently difficult to detect. If youre running a tune, making mods, or driving the 3.5 EcoBoost hard, the lifespan of the ignition components can be significantly reduced. 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. Checked all the ground connections I could find, they all looked good. My 1997 Sebring run good , as long as I stay under 65 . The check engine light is one of the most common symptoms of bad spark plugs. The first day I had my truck, changed plugs and boots.had to it misfired like mad on the way home and knew it had to be done..got a extra 1k trade in for taking it that way and then drilled hole, also cleaned the maf sensors, ran like a champ and still does. Faulty coils and broken electric wires. Additionally, the 3.5 EcoBoost may generate the P0016 fault code, which will illuminate the check engine light. Causes & How To Fix It. random misfire and cyl 4 misfire. What do I do? Remove the insulated cover over the injection pump to get to spark plugs # 5, and #6. Started 5 hours ago, By What else can I do??? Within about 5 minutes of leaving the pump the engine was struggling. Youll have to push down on the gray tab to get the plug to connect from the coil. Always starts and idles perfectly, even passed its MOT. Then, you want to look for vacuum leaks and cylinder compression. I also attempted to clear the keep alive memory by disconnecting the battery for an hour, don't know if this worked but it did zero all the average fuel economy data. Drop In Engine Power: . Update, car is back from the garage without a diagnosis. This is what causes the misfire. Ford did an excellent job updating the second generation 3.5 EcoBoost engine. Still #1 misfire. Issue Severity: SEVERE - Stop driving immediately. Please register or login to enable Dark Mode. Type B detects a condition that is progressing over time. 5. Need some advice here, I have a 2015 F150 3.5 Ecoboost. This revealed a short circuit to earth for one of the HP fuel rail sensor wires. 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. He has been working as a car mechanic for over 10 years, and the majority of them specialized in advanced car diagnostics and troubleshooting. A blown head gasket can cause low compression. If you have any of these symptoms, it could mean the camshaft position sensor needs to . In addition to removing the injectors other items including air ducts, air box, filter MAF, battery, PCM and battery box were removed to help further inspect the wiring loom. In todays article, we will discuss the meaning of engine misfires and what possible issues can cause them. Once the carbon deposits become excessive, walnut blasting the intake ports may be necessary. This messes the air-fuel mixture causing the Ecoboost to misfire on your Ford F150. Started 14 hours ago, By Due to the high turbo boost pressures, spark plugs and ignition coils are subjected to significant abuse. 2.7 EcoBoost stumble on highway acceleration. 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. Earlier generations of gen 1 engines encountered issues with timing chain failure and carbon buildup. I am having same issue. With a false high fuel pressure this leads to lean running and the fuel trim controls ramp up to compensate. Keep your Ford F150 truck running strong. Learn more here: How to find a Vacuum Leak & How to Fix It (8 Easy Steps). Aftermarket Products, Reviews & Installation, Suggestions, Comments & Questions about the Forum, 2006 F150 5.4 Sputtering - New thread CONDENSED. Good morning. There is a gasket located between the cylinder head and the intake manifold called the intake manifold gasket. 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. Thx, My toyota vitz 2nz engine still misfiring even after puting new plugs wat can b the problem. Simply because these issues are classified as common does not mean they affect a large percentage of 3.5 V6 engines. If the problem occurs repeatedly, the engine control module will illuminate the check engine light to let you know that something is wrong so that you can have it repaired. 3. 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. There Can Be Damage To Different Parts Of The Motor. Jun 30, 2021. Ive been driving the Expedition for a month now with the new plugs, and havent received a misfire code. Now the symptoms are less noticeable there are no codes. 2: What fuel are you using? However, it is entirely possible that this is simply because the F-150 is the most popular model equipped with the EcoBoost engine. Lower the ignition coil back down into the well and push it on to the top of the new spark plug. Can a cam sensor make it miss fire on one cyl. Ford has also issued bulletins, indicating that they are fully aware of the timing chain issues. The truck is setting p0302 and p0305 under heavy acceleration. @GARY MASSEY 3.5L EcoBoost Timing Chain Rattle Symptoms & Fixes, Ford Fuel Pump Driver Module Failure Symptoms & Solutions. Regards 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. 00:00 / 00:00. 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. The car wont rev up over 3000revs per min.could iit b a bad ignition coil. Advertising - Its not recommended to drive with engine misfires. Later when I handed it over to the main dealer they changed the plugs again but no improvement. Matilda Magnetic build 2019 6.5' bed crew cab fx4 heavy tow.. Do Not Sell or Share My Personal Information. I turned around and headed home, and after a short distance, the check engine light stopped blinking, and the truck seemed to run smooth again. P0303 definition: Cylinder 3 misfire detected. I do see codeB10EA from the positive temperature coefficient heater sometimes but have assumed that cant be related. My problem is, that it starts shaking when I accelerate to a certain speed. If I do, Ill update this page. No PCM codes so I'm using the car to see if anything changes or codes appear. I really appreciate you, thx for sharing that with us! The plugs should be fine, then. Fuel Injectors Can Get Clogged. Additionally, issues with the 3.5 EcoBoost timing chain guides, tensioner, and cam phasers occur. While this is a common issue with the EcoBoost, it does not occur with every engine. Repair Urgency: Fix this code immediately (same-day if possible) to avoid ignition failure, catalytic converter damage, and dangerous conditions. Worst pressure condition in the cylinder. 27 Jan 2018 00:24 - 28 Jan 2018 10:44 #17294. However, be very careful when doing this and have a fire extinguisher ready. After some research, there are problems with the CAC and many of the trucks left the factory with Mis-Gapped plugs. The dip is so fast the computed pressure in kPa doesn't mirror the raw voltage, but both their trends look noisy. Seriously you need to find a different garage. While the 3.5 EcoBoost is an excellent engine in general, no engine is perfect, and this is true here. Additionally, the use of twin turbos provides an abundance of tuning potential for those looking to get the most out of their engines. I have a different engine to your one but for comparison my Low side pressure is normally around 400-450 Kpa. When the engine control module receives the data, it will determine if the problem is serious or not. Here's my top pick motor oil for the Ford EcoBoost cyclone engine. MechEng, Fixing a misfiring engine can sometimes be difficult without the right knowledge and tools, due to the multitude of possible causes. 1. Often, it is simply normal wear and tear, but early problems are possible. I have had it in several times, with no results. 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. Check the fuel pressure and compare it to the manufacturers specifications. 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. Automotive Performance, Tuning, & Modification. However, this problem still pops up from time to time in the Ford 3.5 Ecoboost engine upgrades. The loom runs below this bracket and in my case there was a rusty stain on the loom. Tajsingh Spin in the spark plug a few turns by hand in the clockwise direction to prevent it from becoming cross threaded. Started 4 hours ago, By . You can expect a cost of $200 to $500 to fix a misfiring engine in most cases. Small bore plastic vacuum lines around the back of the engine have been removed and inspected, all look fine. Spark plugs for stock 3.5 EcoBoost engines will likely need to be replaced every 40,000 to 60,000 miles. Shops frequently charge between $400 and $600 for this service, so its not exactly inexpensive. To be fair to the Ford 5.0 Coyote engine, we believe the 3.5 EcoBoost is a clear choice if offered. If youre experiencing misfires, heres an easy way to determine whether the problem is with the spark plug or coil. Unexpected misfires, check engine light illuminations, rough idleall of these symptoms could indicate that your EcoBoost's timing belt needs to be replaced. (Heres How To Fix it), 7 Best Spark Plugs Review & Buyers Guide, Car Losing Power When Accelerating? READ MORE: 6 Symptoms of a Bad Ignition Coil (& Replacement Cost). RELATED: 5 Signs of a Bad Intake Manifold Gasket (& Replacement Cost). This is primarily a problem with first-generation engines.
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