Cylinder 4 Misfire


I've already changed the spark plugs, wires, distributor, distributor cap, rotor, and the fuel injector #4. :rolleyes:Which version of Standard coils do. Plugs and wires replaced, fuel system flushed, fuel injector for #4 cylinder replaced. Well that's the code I'm getting. Then it would stop flashing and just be steady. DTCs?P0301 through P0306 correspond to cylinders?1 through 6. Solved it, the problem was inside the intake manifold, every cylinder has a correspondent (pipe inside the manifold) from the EGR, the pipe of the cylinder 1 and 2 were clogged, now the burned gases were returning at constant speed and were entering in cylinder 4 causing misfire. Error Code P0304 is described as Cylinder #4 Misfire Directed, which means the vehicle’s computer has detected an engine misfire, specifically with the fourth cylinder. MacFadyen on topic 2009 Subaru Legacy Cyl 3&4 Misfire @ 4,000 rpm Firing order is 1-3-2-4 so 3 & 4 are 360 crank degrees apart but on different banks. I had multiple codes for cylinder 1-2-3-7-8 misfires. So Far I have changes all six spark plugs, switched the coils to see if it would code on a different cylinder, changed the fuel Injector for cylinder 4, completed a compression test on all 6 cylinders (all reading 150 PSI). 2013 JKU #4 missfire and check engine light on at 26k miles If you're getting a misfire code, the may be something else. Sometimes cylinders have intermittent misfires, which means the cylinder does not misfire all the time. P0304 - Cylinder 4 Misfire Detected I can hear the cylinder alternating between misfiring and firing in the exhaust at idle. Notice in the chart that cylinder #5 is creating less air than the rest of the cylinders, but the engine does set up the misfire at this moment, so the problem is not felt by the PCM yet. The complaint was a bad misfire on cylinder #2 with some other random misses on the other cylinders. Misfire is a common drivability problem that may or may not be easy to diagnose, depending on the cause. Here are the codes I pulled prior to clearing them; P0300-Random/Multiple misfire, P0304-Cyl 4 misfire, P0305-Cyl 5 misfire, and P0316-Misfire Detected 1st 1000 Revs. The plug from cylinder #4 has rust/corrosion on the base of it. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. Generally, a misfire will trigger the engine check light and the truck's exhuast will smell like gasoline. In this case it's cylinder #4. Misfire cylinder 2, 3 and 4 It was going on for a day or so then engine shake disappeared. Cylinder misfires constantly with engine light flashing, subsequent engine shaking and loss of power. P0308 Cylinder #8 Misfire. While driving home, the whole vehicle started to shake violently, and the engine light came on (flashing). Haven't got the engine torn down to cam , bougt the set of lifters and gaskets and cost was $ 560, for local dodge dealer. LOL, if you can do spark plugs, swapping coils is cake. I keep getting a misfire count on cylinder 2 and 4. Checked the compression in the #2 and 4 cylinders and checked the pcv and air filterall are good. Ody ran smooth again, until last night, the blinking light appeared again with rough idle and "trembling" upon acceleration. Reset and limped home. Im badly in need of help. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”. you can see coolant on top of piston in cylinder 4 and all the brand new plugs were shot. I replaced injector web,replaced plug wire. The check engine light sometimes comes on (P0304). The weird thing is when the vehicle starts cold it runs smooth and sounds. The only thing is that the threads seem to have been left unanswered. each time ive done all this it fixes it for about 2 hours then back again. Misfire cylinder #4 Discussion in 'General Discussion' started by YukonCO, Jan 6, 2010. Replacing that plug was the solution and I never saw the code again. If you swap coils and cylinder 1 is still misfiring, it's not the coil. The nice thing about P0304 is that it's a cylinder specific trouble code, which makes diagnosing the problems simpler than P0300, which means that the cylinders are randomly misfiring. 2 weeks ago I was driving down the highway when Noticed misfiring, loss of power and a flashing check engine light. While driving home, the whole vehicle started to shake violently, and the engine light came on (flashing). I swapped plug wires, & changed the Spark plug, what else. It ran great for many years. The misfire occurs as a result of a partial combustion process occurring inside one of the cylinders. (the number is divided by two because its a 4 stroke and any given cylinder only fires every once per two rotations of the crank) Total time of spark over 1 hour = sparks/hour*spark duration (in hours) =. The engine idles a little rough and the cel is on. I drive a e39, 520i, 99 reg and hev a misfire on 4,5, and 6 cylinders. DTC P0303 Cylinder 3 Misfire Detected DTC P0304 Cylinder 4 Misfire Detected CIRCUIT DESCRIPTION Misfire: The ECM uses the crankshaft position sensor and camshaft position sensor to monitor changes in the crankshaft rotation for each cylinder. Codes were cylinder 4 misfire and another code related to some type of solenoid. Page 1 of 2 1 2 Next > the rest have been misfir cylinder #4. Keeps car for 2 more days, cannot find an issue. Though, the engine was rebuilt. "Check engine light is on and flashing. Cylinder 4 Misfire Detected. Theory: bad wires or bad coil pack: switched around wires expecting fault to move to a different cylinder, but didn't:so wires and coil pack are good. 7 liter tundra with 208,xxx miles. Intermittent Misfires. with a little oil around the tips. to isolate the root cause of the misfire. #4 part to #1 part) and see if it follows swapped part. Page 1 of 3: How to Troubleshoot a Misfire (GM 4. Any easy test would be to swap out the ignition coils (and plug) with another cylinder (preferable on a different bank). 2004 F-150 5. to recap, about a month ago, I had a 1,2,3,4 misfire. I believe there has been water intrusion into the spark plug well and not only corroded the plug base but likely the coil contact up inside the boot. Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. Basics Causes of a Misfire Condition. Why is my VW Golf Misfiring? That way you will at least know which cylinder has the misfire. When the plug wire is disconnected, its a constant misfire. Page 1 of 2 1 2 Next > the rest have been misfir cylinder #4. I think the problem is the coil pack connection to plug#4. vehicle still had a misfire. If the ECM is able to determine that a specific cylinder is misfiring, the DTC for that cylinder will set, and the corresponding fuel injector is disabled. distributor, wires, and (most likely) spark plug. Keeps car over the weekend and tells me to bring it back on Monday. I have a 2000 ranger with the 6 cylinder, 4L engine and it has 146k miles. this time the codes that came back were m. Have swapped iginition coils and have the same problem on cylinder four meaning that. Step 1 - There are several combinations of misfire conditions, steady or random, at idle or under power, which may or may not be detected by the computer and trigger a check engine or service engine soon light, read trouble codes to help pinpoint the cylinder(s) in question and follow the repair guide below. codes show p0302,p0303 cylinder 2,3 misfire. The fault code reads misfire on cylinder 4. Replied by Andy. He came home for the weekend and I read codes P1521(INCORRECT ENGINE OIL TYPE), P0304(Cylinder 4 Misfire Detected), and P1414(CYLINDER 4 REACTIVATION CONTROL PERFORMANCE). I have come to the point where I have no idea what is causing my problem. Depending on what size engine your vehicle has, one has the coil-on-plug system while the other does not. Code has never been anything other then P0302 #2 cylinder misfire other than the P0300. Cylinder 4 is misfiring, I think it's spark related since I smell un-burned fuel in the exhaust, so I'm guessing the injector is working. Welllllll I freaked myself out even more checked out the symptoms and I have the exact same ones as the people with the gasket issues. My friend came over with a scanner and we got "Cylinder #4 Misfire". The check engine light came on and started flashing (indicating a potentially big issue). With and Without Misfire Codes. Truck is a 2008 GMC sierra 1500 4. What Causes A Cylinder To Misfire? There are several telltale signs of a misfiring cylinder. Came up with the P0304 and a message saying "The PCM has determined that a misfire has occured in cylinder #4. So I change the plugs and it go's away, and comes back. ) Cleaned Throttle Body (Also, I doubt that would case a misfire, LOL. Which was the misfire code. I had the coil pack switched to a different cylinder and the cel stayed on 4. Went thru a "puddle" a little too quick. 0 L 4 cylinder engine and automatic transmission started having a problem a couple of days ago. If it is the #4 injector, how do I replace it. P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code. I hooked the computer up to it, and it is reading P0305-cylinder 5 misfire. 8 L (413 CID) SOHC V10 is a variation of the Modular family created for use in large trucks. For whatever reason, cylinder 1 is not firing correctly (missing some or all ignition attempts). Checked the compression in the #2 and 4 cylinders and checked the pcv and air filterall are good. The spark plugs are all new and I checked their gap as I put them in so that is correct. If I remember right there was a lean code too. During the misfiring event cylinder 3 was the worse followed by cylinder 4 with a few misfires on the other cylinders. Cylinder 4 misfire appeared after some hard pulls on the interstate today. I have a misfire in cylinder 4. The ECU can’t always tell you what specific part is broken, but in the case of our truck, it had stored data indicating there was an engine misfire in Cylinder #4. I have no other codes. Solved it, the problem was inside the intake manifold, every cylinder has a correspondent (pipe inside the manifold) from the EGR, the pipe of the cylinder 1 and 2 were clogged, now the burned gases were returning at constant speed and were entering in cylinder 4 causing misfire. I need some help!I have a 2009 Chevy Hybrid, 6. 6-liter V-6 Pentastar engines. Intermittent Misfires. A vacuum leak into the intake port of the cylinder in question can cause a lack of fuel. 3 with AFM that was NOT caused by a stuck value, collapsed lifter, bad lifter solenoid or flat spots on the #4 cam lobes? I have an obvious misfire at idle which makes the engine stumble about every two seconds and I notice a slight RPM fluctuation on the tach. Ford has come up with TSB 14-0017 to repair this on 2013 and 2014 Ford F-150’s as well (running 3. 7 liter tundra with 208,xxx miles. The nice thing about P0304 is that it's a cylinder specific trouble code, which makes diagnosing the problems simpler than P0300, which means that the cylinders are randomly misfiring. 3L with 100K miles on it. I changed the front 4 plugs just as a quick test to see if it was the plugs or pack. When you have a misfire, the engine will run off balance, creating a powerful vibration through the body of the car, and the amount of power the engine can produce will drop significantly. i have cylinder #4 misfire. Been a lurker here for a while. Got other codes too, but they kept coming and going; 0303 was a constant. The code P0300 stands for random misfire. But that does not address why cylinder 4 seems to be more susceptible to misfire than other cylinders. FIXD explains symptoms, causes, and severity of code P0304. you can see coolant on top of piston in cylinder 4 and all the brand new plugs were shot. 4? misfiring intermittently, also engine warning warning light coming on now and again. During my 4 wheelin' trip it never came back on until I was headed home and going over another pass and then it stayed on for a couple of days. Check Engine Light is flashing. I changed the ignition coil and put platinum plugs in, wires are fine. She still throws it on any sign of boost. P0305 Cylinder #5 Misfire. I have a 2006 5. Likely, it means that cylinder 1 is not getting spark. I have had an intermittent cylinder 4 misfire (code P0304) for about a month now. Since you say it's only cyl no. Additional trouble codes can shed some light on the cause. Near emergency: No start with 4 cylinder misfire on 1998 V70R, in wildfire danger area Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. Check Engine Light is flashing. Hi I keep getting a misfire on cylinder 4 and it seems to happen at idle. The main one, and how I knew I had a misfiring cylinder in my Ford Econoline van several years ago, was that the acceleration decreased by about 500%. replaced #5plug. That means that multiple cylinders misfire at random. I bought it a few months back and haven't had any problems with it until now. So I'm thinking the next step is to check the fuel injector wiring. 3L with 100K miles on it. I took it to the dealer last week and was informed I have a misfire on Cylinder #4 (code P0304). It will suck paper back towards the exhaust during. Every cylinder will have some misfires typically when you run the Mode 6 test before shutting the car off, but Cylinders 1 and 7 usually have the most, with 7 being the one tripping the CEL due to "Catalyst damaging misfires" A single digit misfire event (2-3) will sometimes be logged when shifting gears driving at low speed. Multiple Cylinder Misfire Detected Conditions. Bought a repair manuel, trying not to screw anything up. COM - Duration: 5:11. 7L at auction for a steal about 6 months ago. I think the problem is the coil pack connection to plug#4. It could be a plug, coil, wire, or fuel injector. 4 = 1,280,000 MWh per hour of running. Your error code of misfire with #4 cylinder means that cylinder is not firing correctly or at the right time. I don't think its a burnt valve but i think its a mechanical fault such as a sticky hydraulic valve lifter.  The Misfire monitor diagnostic is based on variation in crankshaft velocity. It will suck paper back towards the exhaust during. I disconnected the battery for 20 minutes and that did nothing either. 3 with AFM that was NOT caused by a stuck value, collapsed lifter, bad lifter solenoid or flat spots on the #4 cam lobes? I have an obvious misfire at idle which makes the engine stumble about every two seconds and I notice a slight RPM fluctuation on the tach. The first thing to understand in this instance is that no. I cleared the codes out with my code scanner, but that didn't do any good. A garage and the Ford dealer cannot detrmine cause. Any easy test would be to swap out the ignition coils (and plug) with another cylinder (preferable on a different bank). 2005 Ford F150 King Ranch Edition 5. ford took this car in and replaced the ignition coil packs and plugs on cylinders 3 and 4. 3 with AFM that was NOT caused by a stuck value, collapsed lifter, bad lifter solenoid or flat spots on the #4 cam lobes? I have an obvious misfire at idle which makes the engine stumble about every two seconds and I notice a slight RPM fluctuation on the tach. then i noticed that THE TIP WAS MISSING?!!??!?!?! Missing tip:. Late Feb 2106, light is back. 0L V8 engine, about 150,000 KM on it. Seemed like an ignition problem,two different sets of new plugs made. 86,000 miles. i even have one still, changed out the wire with a spare, new plugs (was over due anyways), got another injector, and even after my head gasket blew and swapped the head for low mileage head from a cavi, it still has a misfire. My buddy and I could find no leaks. P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code. Misfire is a common drivability problem that may or may not be easy to diagnose, depending on the cause. The first sign of the problem was the service engine light would blink intermittently when driving on the highway or revving the gas. Possible causes of OBD code P0304 Subaru A code P0304 Subaru may mean that one or more of the following has happened: Faulty spark plug or wire Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector Burned exhaust valve Faulty catalytic converter(s) Running out of fuel Poor compression Defective computer. Bad gas mileage. 4 Misfire This vehicle came into the shop with a customer complaint of a rough running engine, a misfire. I got a 98 2. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. replaced spark plugs, wires and coil pack and still the same problem in addition cylinder 1 misfire as well as 2 and 3. Checked the compression in the #2 and 4 cylinders and checked the pcv and air filterall are good. It definitely sounds like it is missing. Within the first week of having it I noticed it wasn’t pulling away properly and was very juddery when sat idle. What Causes A Cylinder To Misfire? There are several telltale signs of a misfiring cylinder. Have a qualified mechanic check it out. Had we not been computer controlled, studying the spark plugs would have helped focus on possible sources. All a flashing check engine light for a misfire means that the misfire was bad enough to cause damage to the cat convertor. i take the gas cap off this car sounds like a popcorn machine when the. P0304 VOLKSWAGEN Tech Notes The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. I checked the plugs and they are Bosch Platinum 4's. Problem just happened without cause on a Sunday morning. It will suck paper back towards the exhaust during. The crazy thing is that the individual cylinder misfire current and history show it on cylinder 4, And I didn't touch that head. I was having a general misfire code. The other day my '97 V6 T100 started showing symptoms of a cylinder misfire. on the pass. Solved it, the problem was inside the intake manifold, every cylinder has a correspondent (pipe inside the manifold) from the EGR, the pipe of the cylinder 1 and 2 were clogged, now the burned gases were returning at constant speed and were entering in cylinder 4 causing misfire. I changed plugs and coil on # 2. Have changed the spark plugs, Checked the coil pack on another cylinder but still comes up with the same code p0304 cylinder 4 misfire. Keeps car for 2 more days, cannot find an issue. Those codes all disappeared and it left me with P0300 multiple cylinder misfire. this time the codes that came back were m. I swapped #4 and #5 coil and reset the check engine light. At first I didn't know what was happening but it was idling pretty rough so I hooked up through my Bluetooth and it was showing p0304 or something like that. The 2011 Dodge Grand Caravan has 4 problems reported for engine misfire. The obd2 code showed a misfire in the #4 cylinder (P0304 I think). Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. Hi my names craig i have a 97 wrangler with the 4. A misfire is what happens when a cylinder fails to combust its air/fuel mixture correctly. There are several possible causes of misfire ranging from worn spark plug to faulty coils. I also think removing the stock air box is a factor as this leaves the coils more exposed. I gave the tech everything that I have done in the last few months and I even had to replace the weak battery a few days ago. Check engine light indicates P0304 code. Although generic, the specific repair steps may vary depending on make/model. Engine Stalls (Check Engine Light May or May Not Be On). The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Code came up a few weeks ago. problem stays with #4 and is sporadic (sometimes cold idle, sometimes hot). We would get the MIL and the code was P0303 - Misfire detected Cylinder #3. I disconnected the battery for 20 minutes and that did nothing either. Welcome to "The Dodge Dakota Forum!" Dodge Truck Forum - Forums and Owners Club! This forum is dedicated to the Dodge Dakota Truck and its owners!. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. Getting a code for cylinder 4 misfire. So as you're staring down at the engine it's 1234 from left to right, as you would read a book (the crank pulleys are on the left-hand side of the engine bay in the Dart). I opted to do this at home so I picked up a coil and plugs and planned to replace over the weekend. Went to AutoZone to pull the code. The Engine light was randomly popped up and sometimes automatically off, especially when I drove more than 100km/h. vehicle still had a misfire. A misfire is what happens when a cylinder fails to combust its air/fuel mixture correctly. It got a little better but the CEL is constantly back on now and the idle is getting worse. What else can I do. Limped it home and parked it and tmro morning will be pulling the #4 coil and plug to see what's going on. ENGINE MISFIRE CODES P0300 - Multiple Cylinder Misfire P0301 - Cylinder 1 Misfire P0302 - Cylinder 2 Misfire P0303 - Cylinder 3 Misfire P0304 - Cylinder 4 Misfire P0305 - Cylinder 5 Misfire P0306 - Cylinder 6 Misfire include--Purchase date -mileage at which it threw the first code,and any recurring (what code)-your request to dealer and drop. For whatever reason, cylinder 1 is not firing correctly (missing some or all ignition attempts). Primary or secondary ignition components can go bad and prevent the spark from being delivered properly to the cylinder which would result in an engine or cylinder misfire. Replaced the ignition coil on cylinder 3 and she runs like a champ again! Quick note: posters above are correct on the FIRING ORDER being 1-3-4-2. Its a V6 4. cuz i couldn't reach. cylinder 4 misfire repair cost. with a little oil around the tips. After 15 minutes of driving, the p0304 : cylinder #4 misfire code was revealed with the OBD-II scanner again. ) Also ran a compression test, and that turned out fine. The 2011 Dodge Grand Caravan has 4 problems reported for engine misfire. DTCs?P0301 through P0306 correspond to cylinders?1 through 6. I cleared the codes out with my code scanner, but that didn't do any good. Cut to 3 days later, and it seems to be running a little rough. But I still seem to have the miss. Jun 21 2017, 4:54pm The simple way is to get a long screw driver and one end on injector and the other to ear (like a stethoscope) or buy a noid light that plugs into injector plug and fire up to see if the light is flashing on and off. My buddy and I could find no leaks. The blinking would stop after a few minutes and the light would go away. If an individual cylinder misfires it sets a designated code for that hole. when i removed the one in cylinder 4, i noticed it was covered with soot. Cylinder 4 misfire I have an 01 Legacy GT and keep getting the check engine light for cylinder 4 misfire. Although generic, the specific repair steps may vary depending on make/model. You can see that #3 is right after #4. I was driving around 45-50mph and my engine suddenly lost acceleration. I fixed my car for $5 instead of $250. You could have other problems setting codes and wouldn’t know because you think it’s just from the intermittent misfire codes that set randomly. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. Code came up a few weeks ago. Runs okay for a short period and then starts to misfire. There are several possible causes of misfire ranging from worn spark plug to faulty coils. It could be a plug, coil, wire, or fuel injector. This morning, i went out and restarted the engine and the misfire seems to have gone away. But less than a week later, same 3 and 4 misfire. Re: Misfire on Cylinder 3 - fault code P0303 Originally Posted by SteveDC I've read on other posts that its normal to get oil in the spark plug hole on the spark plug on the far left as the oil spills into here when the oil is filled. Diagnostic machines says random misfire. Vacuum Leak. The code thrown was a #1 Cylinder Misfire. The probability is that the fault is electrical rather than mechanical. Pulled codes and got 0303: misfire in cylinder 3. Car is misfiring. Primary or secondary ignition components can go bad and prevent the spark from being delivered properly to the cylinder which would result in an engine or cylinder misfire. P0300 - Random/Multiple Cylinder misfire detected P0301 - Cylinder 1 misfire detected P0302 - Cylinder 2 misfire detected P0303 - Cylinder 3 misfire detected P0304 - Cylinder 4 misfire detected P0305 - Cylinder 5 misfire detected P0306 - Cylinder 6 misfire detected P0307 - Cylinder 7 misfire detected P0308 - Cylinder 8 misfire detected. this was cause with heavy carbon build up. It was idling rough and giving me all sorts of vibration at 65 mph and around 2200 rpm. Okay, six cylinders of potential problems have just been narrowed to one. Here is what I have done: 1. Drove it for a few days and it would misfire at idle but accelerate with out hesitation then for a few days it cleared out, well I moved and didnt drive the car for about another 4 months, then when I came to move it I tried to turn it on and the motor would turn over start for about 2 seconds and die. the the car's computer has detected that one of the engine's cylinders is not firing properly. The result is an engine that stumbles, idles roughly, and doesn't perform at 100% power. Engine mechanical Condition So, I changed my plugs, assuming this might be the issue as I have had it since April 09' and never changed them. I swapped plug wires, & changed the Spark plug, what else. What would cause this? This is a 1998 Windstar. Van is giving an occasional misfire on cylinder 4. Car still at dealer 2 days now. The following day I started to investigate. Had bad cylinder valve seating causing a bad fuel to air ratio causing misfire codes in 4 cylinders. Here are the four different types of misfire and how to diagnose them: Ignition Misfire. if it misfires in cyl. Although generic, the specific repair steps may vary depending on make/model. P0308 Cylinder #8 Misfire. Can someone explain to me what happens next? Is this a spark plug issue or a bad gas issue or are there other possibilities?. i even have one still, changed out the wire with a spare, new plugs (was over due anyways), got another injector, and even after my head gasket blew and swapped the head for low mileage head from a cavi, it still has a misfire. P0304 - Ford; Type: Powertrain - Ignition System or Misfire - ISO/SAE Controlled: Description: Cylinder Number 4 Misfire Conditions. If the Engine System has a Misfire Counter for specific cylinders on the Scan Tool Data Stream, pay very close attention to the cylinders(s) named in the misfire code(s). Van is giving an occasional misfire on cylinder 4. Misfires reduce gas mileage and increase emissions, which can cause you to fail an emissions test. Noone seems to have cleared their problems completely from what I read. It would run like crap (obvious misfire) and running it hard would clear it until it was babied again for too long of a time. 29CD - Combustion Misfire on Cylinder 1 29D0 - Combustion Misfire on Cylinder 4 Due to both cylinder 1 and 4 being highlighted as the cylinders with the combustion concern, a fault such as incorrect identification of the cylinder was ruled out. P0304 cylinder 4 misfire and according to the local dealership that is synonymous with this defect, keep in mind the car has only 27k miles, Trouble codes related to this would tell you a possible coil, spark plug, evap leak or egr valve, the dealer confirmed it was neither one and it was the faulty cylinder head. The main one, and how I knew I had a misfiring cylinder in my Ford Econoline van several years ago, was that the acceleration decreased by about 500%. The blinking would stop after a few minutes and the light would go away. I too had a misfire code before on my 4. It definitely sounds like it is missing. Why, GM Says that misfires are normal and only a sustained and continuous misfire will be recorded causing a code to be set. P0304 Tech Notes The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. During the misfire event, all the data was fairly normal. Additional trouble codes can shed some light on the cause. What Causes A Cylinder To Misfire? There are several telltale signs of a misfiring cylinder. Making a ffft, ffft, ffft sound from the exhaust. #4 part to #1 part) and see if it follows swapped part. The plugs were not more than a month or two old at the time, but one of them had failed. While driving home, the whole vehicle started to shake violently, and the engine light came on (flashing). In many instances, stalling ends up being an idle control motor at its limit or a failed motor. Will not pass the emissions tests. I checked the cylinder 4 spark plug and there is oil on the electrode part which is almost like oil sludge. 100,000 miles and code just came on. This fault is present (meaning it is currently happening) P0303-1 That there has been a misfire on cylinder 3 ( but not currently present, could be an old code) We can also see the code P0304-1 for the current misfire on cylinder 4. Hi, I’m new to the group. So it definitely is not the coil. [/CODE] I would check all items in that order by swapping out the parts to make sure (ie. 4L Ford vehicle. I will show you how to identify which cylinder is misfiring if you have a random cylinder misfire P0300 and once you find out what cylinder is misfiring I will also show you how to find out what’s causing the misfire. Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. I am replying on behalf of my girlfriend who burst out saying "I have a misfire on cylinder two" :yikes: nearly blew my ear off! So her car is a 2008 1. unplug the harness and swap 4 to 1 and 1 to 4. Page 1 of 2 1 2 Next > the rest have been misfir cylinder #4. Near emergency: No start with 4 cylinder misfire on 1998 V70R, in wildfire danger area Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. XLT model 5. Ford Focus 2 1. Ignition System Concern 3. Engine Stalls, Misfire Code, & Cylinder Misfire The engine may be stalling because it isn't getting enough throttle opening. - started up my car the other night and my engine light came on, trac light came on. wierd but alot of us started having cyl 4 misfires since the begining of this year. ) up-down-up down every 3 or 4 power strokes.