Started February 20, By Nonetheless, turbo technology has advanced significantly over the last few decades. To protect yourself, here are the tried and true methods: Remember, the root cause of ecoboost misfire is the condensate buildup from the intercooler. How Much Does It Cost to Fix Engine Misfires? Did compression test and cylinders were 150, 150, 149, 149. Failure of any of these sensors can cause an incorrect air-fuel mixture to enter the engine, which can cause the engine to misfire. The bracket was removed, and loom insulation damage was visible. Carbon deposits accumulate over time and obstruct airflow into the cylinders. Pennzoil vs. Mobil 1 Oil: Differences & Which Is Better? Copyright 2023 Mechanic Base. Here is a more detailed list of the most common cause of engine misfires: 1. You earlier indicated that your reservoir tank was "lowering as usual" or similar to that wording without me going back and checking. The numbering of the cylinders on a Ford F150 starts from cylinder 1 on the front and goes backward. Carbon deposits can result in cylinders receiving an uneven amount of air. I've pulled the injectors and sent them for cleaning and testing, will report back results. However, it is entirely possible that this is simply because the F-150 is the most popular model equipped with the EcoBoost engine. plasticpat Changing transmission fluid usually takes care of torque shudder, Torque converter usually isn't bad, just needs new fluid. 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. Had a slight misfire so I changed Spark Plugs and Coils. This misfiring of the Ecoboost leads to rough idling, stuttering, and fault codes. Low fuel pressure is another thing that can cause misfires. Carbon deposits should not pose a serious threat to the 3.5 EcoBoosts longevity. 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. Received 13 Likes on 13 Posts. . Last thoughtI've still yet to test it towingneed to know whether I'll still have to play the game jumping between 4th and 3rd depending on the incline. 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. The check engine light is one of the most common symptoms of bad spark plugs. RELATED: 8 Causes of Low Compression in a Car Engine (& How to Fix). More often than not, your engines computer will be able to detect bad spark plugs in your F150. If you are installing brand new plugs, tighten them until you feel the new crush washer collapse. 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 overtaking. What are your thoughts on the 3.5 EcoBoost? He shows location of low side pressure sensor (and goes through other common faults). Its a powerful engine with 355 to 647 hp and plenty of torque. Jiffy Lube Vs. Valvoline Oil Change: Differences & Which Is Better. Automotive Performance, Tuning, & Modification. Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. As a result, the cylinders of the 2.7 EcoBoost may experience inconsistent air delivery due to restricted airflow. Ford F-150 Misfire Symptoms. The most common causes of engine misfires are bad ignition coils or failed spark plugs. If an issue does occur, it is prudent to replace the entire timing chain assembly. 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. 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. After some research, there are problems with the CAC and many of the trucks left the factory with Mis-Gapped plugs. Is there any cheap way to improve compression or get rid of the code? This revealed a short circuit to earth for one of the HP fuel rail sensor wires. If this does not work, repeat the procedure using the 3.5 EcoBoost spark plugs. I did the thottle position sensor reset procedure and that helped for about 2 days. . If you're located in Florida especially in Hollywood, i wanna meet you so i can get my car fixed for good. 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. However, you have some control over how well the twin turbo EcoBoost engine is maintained. John, thanks for your reply. The majority of 3.5L V6 EcoBoost engines should have no significant issues reaching 200,000 miles or beyond. At this point I decided to just change the spark plugs. There are several misfire related trouble codes. Their proposal is now a wiring loom or PCM, the first cost a lot in labour and the second a lot in parts and no guarantees. In any case, the first generation EcoBoost produces 355-380 horsepower, depending on the vehicle. To determine if you have low compression, remove the spark plugs. Here's How To Fix It, 5 Symptoms Of Bad Gas In Your Car and How to fix it, 8 Causes Of Low Engine Compression and How To Fix It, 5 Symptoms Of A Bad Engine Control Unit and Replacement Cost, P1326 Code Meaning, Causes, Symptoms (& How To Fix), 5 Symptoms Of A Bad Engine Control Module and Replacement Cost, P1131 Code Meaning, Causes, Symptoms (& How To Fix), Car Wont Accelerate But RPMs Go Up: Causes & Fixes. There is a gasket located between the cylinder head and the intake manifold called the intake manifold gasket. Started 14 hours ago, By If your car engine is misfiring, it is important to find out the cause and fix it as soon as possible. On the 2.7L EcoBoost expect to replace spark plugs at around 40,000 to 60,000 miles. Many faulty 3.5 EcoBoost timing chains, on the other hand, were almost certainly replaced at some point. 2013 Ford Escape SEL AWD 2.0 Ecoboost Mileage 110,000 Hello! Youll also want to inspect the spark plugs and ignition coils. Carbon build-up is simply a disadvantage of relying solely on direct injection. This is why you HAVE TO DRILL the 1/16" intercooler weep hole. Woww wow wow great article! https://www.bmdiag.co.uk/forscan-diagnostic-cable-for-ford-vgate-vlinker-fs, Touch up repairs - clues/recommendations/tips, Front end creaking/ knocking when breaking, Windows not working mk7 1.0 2016 red edition, My pcv valve is leaking oil onto the radiator fan, Ford Focus Titanium 2015 - Battery Issues. 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. You may also notice problems such as the engine stalling at idle or an uneven idle that jumps up and down. Having said that, well delve deeper into these 3.5 EcoBoost issues below. and you'll notice engine misfires, startle, and low millage. Yes. 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. The wideband front O2 sensor should show a Current of 0 most of the time under constant or no Throttle openings. 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. As fuel poor pressure measurement and control was one of the key symptoms this was almost certainly the smoking gun. Dave thanks for your reply and suggestions. 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. 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. Turbo engines require more maintenance than the average engine. Started February 9, By A blown head gasket can cause low compression. The loom runs below this bracket and in my case there was a rusty stain on the loom. However, this problem still pops up from time to time in the Ford 3.5 Ecoboost engine upgrades. I do see codeB10EA from the positive temperature coefficient heater sometimes but have assumed that cant be related. Well also look at how to determine if your engine is misfiring and answer some common questions about misfires. By Ignition coils have a life expectancy of 25,000 miles if were lucky. Zain. The low side fuel line appears to be plastic and has a small, sealed device, possibly a damper, no connections or wiring for a sensor, must be a model or year variant. Aug 11, 2020. Best regards, Hi Mr. Selln Your previous content has been restored. 3: Clean MAF, ensure air cleaner is clean and not damp, 4: Turbo bypass valve is weak and can leak, fit a turbosmart replacement (cheaper and more durable than OEM), 5: Have the plugs been changed? The 3.5 EB comes in two distinct generations, which we will discuss briefly below. Faulty plugs. If I get on the highway at 70 , It does not take long to get the check engine light. I did not find any evidence of carbon tracking on the plugs I removed. This disturbs the air-fuel mixture, which may result in the 3.5 EB misfiring. Additionally, direct injection causes carbon deposits on the intake valves, which can cause drivability issues. Low fuel pressure causes less fuel to enter the engines combustion chambers, resulting in a lean air-fuel mixture that can cause misfires on all cylinders. Fuel related misfires can be caused from too much fuel. Did you fit standard OEM? Maintain the Ford EcoBoost engine properly, and it will almost certainly reward you with a dependable, enjoyable driving experience. If you lose power while driving on a busy road, this is a safety hazard. The second most common cause of a misfiring engine is bad or failing spark plugs. This will be discussed in greater detail in the upcoming discussion of common 3.5L EcoBoost engine issues. 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? Update, car is back from the garage without a diagnosis. If you have any of these symptoms, it could mean the camshaft position sensor needs to . 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. The truck is setting p0302 and p0305 under heavy acceleration. I had a hard time describing what it was, but now this is the clearest description of . Your link has been automatically embedded. if everything is working correctly. This oil eventually cakes onto the intake valves as it travels through the intake tract. It can also seriously damage your engine. Tajsingh As for these Ford 3.5 EcoBoost, problems result from the engine using a direct injection fuel system and being twin turbo. Castrol Edge vs. Mobil 1 Oil: Differences & Which Is Better? Great helpfully web site. Check battery terminals are properly clamped and that the earth lead between the engine and chassis is good. Diagnosis: A cylinder 3 misfire can be caused by anything from faulty spark plugs to low engine . Started Wednesday at 03:50 PM, Ford Owners Club This has been done since 2011 to get these 3.5 ecoboosts to work better. 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 Up Next: Ford 1.5 EcoBoost Engine Problems: The 4 Most Common Problems. Therefore, if you have checked the basics, it may be worth taking your car to a qualified mechanic for expert advice. P0300 - this trouble code indicates that there is a random misfire. You can check for vacuum leaks by gently spraying a flammable spray around the engines intake manifold while the engine is idling. 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. If the problem comes from the drivetrain and not the engine, the CV joints or driveshafts are common causes. I have a 2003 BMW 745i 7 series. Often, spark plugs are to blame, as their lifespan is significantly shorter than that of ignition coils. Ford F150 Forum - Community of Ford Truck Fans. Within about 5 minutes of leaving the pump the engine was struggling. Changed the coil packs, no improvement. Thx, My toyota vitz 2nz engine still misfiring even after puting new plugs wat can b the problem. 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. The most common code you will see is the P0300 code, along with a code like P030X. V8 engines have a completely different tone than a four-cylinder engine, for example. As a result, carbon accumulates on the intake valves over time. Birdzini Misfires Are More Common Than You'd Think. This contributes to the prevention of carbon build-up, which we will discuss later in this article. In the case of a misfire a P0300 (random or multiple cylinder misfire), or specific cylinder P0301-P0306 should have triggered. 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. 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. Display as a link instead, To refer to spark plugs and ignition coils as a issue is probably not accurate. A random misfire means is that a misfire is detected . A design defect allows coolant to leak into the cylinders of the 1.5L, 16L, and 2.0L EcoBoost engine. Terms of Service - 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. Ford did an excellent job of addressing these issues once they became aware of them. I don't know what Scan Tool you are using but FORScan is your best bet for Live Data on any Ford car. Rather than that, they are a few of the most frequently encountered issues when something goes wrong. Therefore, the first thing you want to do when diagnosing misfires is to check the trouble codes with an OBD2 scanner. Remove the plug on the ignition coil of the cylinder you're working on. On Friday they proposed and fitted a new in tank fuel pump but still in improvement. Spark Plugs And Ignition Coils Issues. Dirty filters/Fuel filter clogging. Low coolant levels can lead to the engine overheating, misfiring, or catching on fire. Older cars use a distributor to distribute the spark to all the spark plugs, which are powered by an ignition coil. This assists in removing oil deposits and preventing them from accumulating. When I got home I scanned the truck for trouble codes, and discovered these codes: P0300 (Random/Multiple Cylinder Misfire Detected). Additionally, Ford redesigned the timing chain in response to concerns about the previous designs reliability. Ford 3.5 TT V6 Carbon Build-Up Symptoms. 4) Poor Engine Performance. Like you I thought spark plugs and changed them early on but sadly no improvement. Ford 1.6 Inline-4 Timing Belt Change. 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 am having same issue. Need some advice here, I have a 2015 F150 3.5 Ecoboost. Glenn hastie data shows primarily cylinder five misfiring. To be honest, this is mostly here because weve run out of other topics to discuss regarding the 3.5 EcoBoost. 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 ??? Replacing the timing chain and other critical components is not a simple or inexpensive task. This makes the 3.5 EB an excellent engine for towing and fun around town without requiring full use of the engines RPM range. To fix engine misfires, you need to read the trouble codes from the engine control module and continue troubleshooting from there. 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. 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. Update, still not fixed, Ford Main dealer have discussed with Ford UKand both are unable to offer a diagnosis with any confidence. 27 Jan 2018 00:24 - 28 Jan 2018 10:44 #17294. If you do this, and change spark plugs every 30k miles, you will never have a misfire ever again. Ford addressed this issue with the second generation 2.7 EcoBoost by utilizing port injection. 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. Those idiots told me I needed a new charge air cleaner, intercooler, possibly new turbochargers and whatever it was would be like $3000. Joined: Thu Mar 23, 2017 6:09 pm. Otherwise, its primarily labor associated with gaining access to the intake ports. Small bore plastic vacuum lines around the back of the engine have been removed and inspected, all look fine. Shudder fix additive can also help as stated above. You can also open the hood of your car and watch the engine idle. Just a theory. My scan tool isFoxwell NT530 Full Systems Scanner for Ford, which is a small stand alone hand held unit with access to all vehicle modules. 3. However, because carbon build-up occurs over time, it is frequently difficult to detect. Simply because these issues are classified as common does not mean they affect a large percentage of 3.5 V6 engines. I need some direction with this one. Failed injectors arent very common on most modern car models, and because of this, youll want to check out the other possible causes first. There is a red locking tab on the plug: Slide the red tab back to unlock the plug. Terms of Service - By These misfires often occur under load from the engine, such as when you accelerate quickly. This is fairly standard procedure for any engine, and the Ford 3.5L V6 is no exception. Speechless. You can post now and register later. Privacy Statement - Early EcoBoost engines were also known to catch on fire, leading to a 2012 recall and "stop driving" order from Ford. Ecoboost 1.0 - Difference Between 100Hp And 125Hp Version ? What Happens When You Put Too Much Oil in Your Car? Ford did an excellent job updating some of the engines weak points with the second generation engine. Need some advice here, I have a 2015 F150 3.5 Ecoboost. Matilda Magnetic build 2019 6.5' bed crew cab fx4 heavy tow.. Do Not Sell or Share My Personal Information. The car wont rev up over 3000revs per min.could iit b a bad ignition coil. Tighten the plug in the clockwise direction with the 3/8 drive ratchet to just past hand tight. Misfires can cause all sorts of problems, from reduced fuel efficiency to complete engine failure. READ MORE: 15 Types of Car Sensors (& What They Do). A DIY solution to a water leak can have disastrous results. Only history I have is the truck has had all six ignition coils replaced . 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. Jan 23, 2021. ouguru said: 2011 F150 FX4 with 3.5L Ecoboost developed a severe misfire at 65k miles. (Heres How To Fix it), 7 Best Spark Plugs Review & Buyers Guide, Car Losing Power When Accelerating? In todays article, we will discuss the meaning of engine misfires and what possible issues can cause them. Remove the spark plug and ignition coil from that cylinder and visually inspect them and replace them if they look bad or dirty. Thank you for explaining how "misfires" are detected by the camshaft position sensor detecting slight changes in engine speed. Its best to diagnose and repair the issue as soon as possible. I thank you for making my life so much easier I'm going forward finding my problem. 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. Vehicle does not drive like it used to. Certified Automotive Diagnostic Technician. Manage Preferences - However, Ford pioneered the use of turbochargers, direct injection, and variable valve timing. The most common cause of an engine misfire is a bad or failing ignition coil. Yeah the misfire is only on cylinder 4 according to the AP and about 2 weeks ago it began. Started 5 hours ago, By Low Engine Compression. Rotate the ignition coil back and forth a few times to help spread the dielectric grease. [FIXED] 2011 f-150 3.5l GTDI misfire under load was created by ptebo1. 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. 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. Remove the bolt that holds the coil pack in place with a 8mm (5/16) socket. Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. The lawsuit alleges that the leaking of . Fortunately, Ford issued a service bulletin in response to these issues. Symptoms of 2.0L EcoBoost Coolant Intrusion. 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. First check all ground connections are clean and tight. Received 31 Likes on 28 Posts. If you cant find the issue elsewhere, its definitely worth taking a look at your fuel injectors. He has been working as a car mechanic for over 10 years, and the majority of them specialized in advanced car diagnostics and troubleshooting. If either the distributor or the ignition coil creates a weak spark, it can cause misfires. Low fuel pressure can be caused by a faulty fuel pressure regulator, a faulty fuel pump, or a clogged fuel filter. My caddy 1.6 carb had still misfired after changing coil, boggy cords, plugs, distributor cap, rotor and some fuel lines. i have a 2013 kia forte, the check engine light came on and, the car does not have an engine problem. There are always a few kinks to iron out, and they were relatively minor with the 3.5 V6. Tighten the bolt in the clockwise direction with the 8mm socket and a 1/4 drive ratchet until it is snug. 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. Spark plugs for stock 3.5 EcoBoost engines will likely need to be replaced every 40,000 to 60,000 miles. Clear editor. If youre unlucky, it could be due to poor compression, which can be very expensive to repair. 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.. Cookie Policy - 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. You can expect a cost of $200 to $500 to fix a misfiring engine in most cases. Ford told me that plugs 2 and 6 are cracked and coil in number 2 needs replaced. Likes: 15. Upload or insert images from URL. On naturally aspirated engines, spark plugs frequently last over 70,000 miles, while ignition coils typically last about twice that. As a reminder, the Ford 1.6L timing belt should be serviced every ten years or 150,000 kilometers (whichever comes first). 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. FORScan can access Mode 6 but I don't know what TID's are available for your car. It is not recommended to drive your car at all with a misfiring car engine. Started 8 hours ago, By 9. Additionally, Ford did an excellent job with the second-generation 3.5 EcoBoost in addressing some of the issues. Even if the repair is not covered under warranty, you may be able to negotiate a discount or other form of compensation with Ford. The engine misfires, resulting in rough idling, stuttering, and fault codes. Is it in the fuel tank as part of the pump module? 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. These are typically urgent issues that should be addressed immediately. However, numerous other factors can cause rattle. The socket should have a rubber insert or a strong magnet to securely hold the plug in place. The engine started fine and has been driving perfectly for over a week now. Paste as plain text instead, While the 3.5 EcoBoost is an excellent engine in general, no engine is perfect, and this is true here. The 74-page lawsuit was filed by five plaintiffs, Robert Reed, Stacy Coppock, Craig Morford, Kelli Morford, and David . Thank you for your help. 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 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. Matilda Magnetic build 2019 6.5' bed crew cab fx4 heavy tow.. Do Not Sell or Share My Personal Information. However, finding these vacuum leaks is often quite easy and we will talk about that further down in the article. It can also be caused by fuel-related issues such as a faulty fuel injector or a bad fuel pump. If you dont know when you last changed the spark plugs, you need to check your service manual and replace them if necessary. P0303 definition: Cylinder 3 misfire detected. 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. but I don't feel or hear any misses . 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. Learn more here: How to find a Vacuum Leak & How to Fix It (8 Easy Steps). The smaller twin turbochargers are quick to spool and deliver a significant amount of low- and mid-range torque. The carbon build-up causes uneven combustion, and it messes up the air-fuel mixture. This video may help. If you find trouble codes on an engine sensor or low fuel pressure, youll want to start the diagnosis from there. For the car engine to work properly, the perfect mixture of air and fuel is required, along with a clear and strong spark. Ford also added port injection to the second-generation 3.5-liter V6 twin turbo engines. You can do this with either a compression tester or a leak-down tester. Not too shabby in terms of longevity. Certain DI engines can even run their entire lives without any valve cleaning. Clues so far is that it doesn't like colder temperatures e.g. Code says multiple misfire's . Yes I agree. You may also consider simply replacing the spark plugs. Unexpected misfires, check engine light illuminations, rough idleall of these symptoms could indicate that your EcoBoost's timing belt needs to be replaced. When symptoms exist and there are no codes, it becomes a little more difficult. 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.