Golf IV R32 :: Random Misfires On Cylinders 4 / 5 And 6
Apr 19, 2010
I am getting random misfires on cylinders 4, 5, and 6. Mostly on 6, less on 5, and even less on 4. Cylinders 1-2-3 show ZERO misfires. I am using vag-com to monitor these. Mostly doing it on idle, cruise seems fine but occasionally when shifting I feel it when engaging the next gear. It doesn't buck but I feel a little hesitation. Cruising and accelerating I do not feel it. Its very strange. A couple times during extended idling I have even gotten a flashing CEL. Fuel mileage has been pretty bad ever since I got the car in December. Average tank gets me 250-270.
I tried swapping coils with 123, and the problem stayed on 456. Coils are all new since I got the car. Plugs are fairly new (under 5K) and I pulled a couple to check, they looked fine and gap was about .028. I might try a new set but my gut is telling me the problem is some where else. I would like to verify/test grounds but I don't know where the harness grounds out.
I also want to get a vacuum gauge on the FPR, or check fuel pressure at idle. I replaced one cracked vacuum line, i am thinning there might be others since there seems to be miles of vacuum line on MK4's. Also have a new fuel filter to install, mine appears to be OEM and the car has 97K.
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I have a mk4 1.8t Gti. Recently I have been having issues with idle and boost. I read the codes and multiple random misfires in all 4 cylinders came up, idle control and the crank, knock, and o2 sensor came up. Shows that system is running to lean as well. I changed the spark plugs and wires, check the coil packs they where done about 1k miles so I expect them to be perfectly fine. When I clear the codes it idles below 9-8k rpms. I also noticed the breather hose coming out of the valve cover into the EGT has a hole melted into it, could this cause any of my issues?
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OK. I have a 2005 Passat 1.8t fwd. Tiptronic. 105k
The symptoms i am having is random cylinder misfires on all 4 cylinders. I have scanned with vagcom multiple times and get the same codes. However, I have cleared the codes, and wen fpd a 60 mile drive on the turnpike. Not a single code. So everything is perfect as long as the car dissent have a chance to idle.
I have also driven the car while logging misfires and only get misfires at idle. Never while driving.
So much has been done to the car that is so hard to decide where to start. Ill try to go in order of events.
All this in the past 4 weeks by the way.
Took car to very experienced VW tech. Found out.timing was off by 3 degrees. So new timing belt, water pump and all. Started car, still had misfires. Noticed wetness on head gasket. And did a compression test. Very bad results. (I can't remember the numbers but they were way off from each other) So he removed the head. He said there was a crazy amount of carbon buildup in the combustion chamber. Everything was cleaned, head inspected for bent valves and everything looked perfect after cleaning. (this car has NEVER overheated by the way) He said it is very rare for a head gasket to fail on 1.8t's . So he did a leakdown test and turned out the piston rings were shot. So engine was rebuilt. All components cleaned of carbon, replaced all parts, bearings with new OEM parts. Pickup tube cleaned along with other oil lines. Turbo was inspected, and I was told it is on its way out but still has life. So that was let go for now. All reassembled and all hoses checked, combi valve cleaned, new k&n filter in stock airbox. So he told me the car is finished after all that. I was excited! Drove the car home 15 min drive, ran great. Parked in my driveway, put it in park and misfires came right back. Called him the next day and brought the car back. He looked over it and replaced the fuel pressure regulator with new. He said it seemed like a fuel starvation issue. Tested fuel pump and it was towards the low end of the proper operation value. So I had a high flow pump sitting at home brand new and I brought it down and put it in. Still misfires but a lot less than before. Also fuel filter was replaced. So next he disconnected the cat And found it was clogged. Replaced with my old Audi one, and it ran fine. And this is the first time the car idled good enough to get all the monitors set for emissions testing. So he was convinced it was fixed. Room it for a test drive and came back, parked And began misfiring again. So I was so sick of this thing at this point, I told him to replace the Turbo with brand new OEM unit. And it still misfires.
He swapped a known good throttle body into it and no difference. He also said that he started going around and unplugging sensors and the more sensors he unplugged, the better the car ran. He was curious whether the ECU was faulty. So he put an ECU from his Audi in it which had a ko4 file in it. He said it ran amazing!! So he modified an ECU from a stock Audi and that's what I am driving with now. Still same symptoms. But not as often. Also brand new bosch mass air sensor was installed as well. So this is as far as we have gotten with it and I am so sick of this car right now. But we are both determined to get this thing fixed! And after all the money I have just spent, I can't even get rid of it or I will lose a lot of money. It really sucks because I love the car and so does my wife. And out of the three 1.8t's that I own, I have never had any major issues like this.
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I have 11 tiguan 2.0T. When I start it up is runs rough below 1200 rpm. The check engine light starts flashing. The codes are all 4 cylinders for random cylinder misfire. When I go drive it around the roughness calms down but doesn't go away and the idle will start jumping up and down. It goes to 1500 back to 800. Then 1700 back to 800. It had even hit 2400 once. I have changed the pcv about 2 months ago. I checked it and it looks fine. One place said maf. I cleaned it and no change. Running out of options.
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So I have never worked on the 2.5 before, I have an 01 A4 1.8T so I am used to VAG products though. The other day my neighbor had a CEL light, when I read the code it was a misfire in cylinder 2. Since it was a single cylinder I told him it was most likely a coil pack but asked if he had ever done plugs. He bought the car with around 60k and it now has 90k but he didn't think they were ever done. So I suggested swapping them out with the new coil pack. So he bought a (5) plugs and (3) coils since that is all they had local. Initially he just replaced the one coil and said the car was running great. Then when he had time he threw the new plugs in (Autolite Iridium don't recall #) and put the other coils in. After doing this the car went into limp mode and is showing random misfires in all cylinders. He pulled one of the new plugs and noticed that the dimensions of the plug appear different than the OEM plug.
The OEM plug has a longer threaded section so it would project into the cylinder further and the insulator on the new plug appears to have several rubber seals on it. Since he is getting misfires on all cylinders I would think it is plug related especially since the plugs are dimensionaly different, but he even checked the manufacturers website and they say these are a direct replacement. Did they change the plug design or is this a known issue with some cross references?
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My girlfriend's MkV Jetta 2.0T is throwing a code for misfires in Cylinders 1 and 2. I've already switched out the plugs and coilpacks with no change. I'm going to try re-positioning the coilpacks to see if the code follows. In doing some research, someone mentioned that it could be fouling on the injectors, which led me to BG44K. She has >215K miles. I figure she's gotta have some fouling that could be cleaned up. I have ~110K miles on my R32 - I figure it wouldn't hurt to do some cleaning in my own car.
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I'm getting random misfires on all 5 cylinders on my 2013 2.5L with ~4200miles. Sometimes the CEL will stay on other times it just flashes and goes away. I've gone to multiple dealers and none of them has done anything but clear the codes because "we couldn't replicate the issue," or "It's just rev hang/drive by wire."
What are the known causes of a brand new car misfiring? And what should I have VW look at?
When I mentioned that our family has a 2007 Eos all three dealers were chomping at the bit for me to bring it in for recalls I didn't even know about. This really rubbed me the wrong way. I've got one car that I KNOW is malfunctioning that VW won't do any work on, but the other VW is volunteering to work on!
I've got another appointment set for tomorrow after I get off work. How to push the right buttons or say the right words?
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Ok so I'm having weird issues with my big turbo R. I thought I was having misfires in low rpm range. Car was stumbling and just not firing on all cylinders ( just an expression but that's what it felt like) realized it was because of the esp. Ok no the main issue. Vacuum was sitting around 14hg. When I come up to a light or stop sign or just put in neutral while moving it revs it self ad vacuum will go to almost 0hg until I come to a full stop.
The rev is not a big rev only like 100-150 rpm increase. Also the throttle response is not there if I go to rev match down shift. Here's the weird part. If I unplug the Maf it runs super smooth 19-20hg vacuum amazing throttle response clutch chatter almost goes away. There are no cel with or without the Maf plugged in I have logs for both...
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It all started a few months ago.... I started my car, and it started noticeably misfiring, CEL flashing and everything. I scanned it with my vagcom and it came up Cylinder 1 Misfire and Random Multiple misfire. I popped the hood, made sure everything was seated correctly, and shrugged.
Ordered some new wires for it, since it had 80k miles on it with original wires, I figured why not. The misfire didn't come back.
A few weeks later, same thing happened. Misfires, flashing CEL, same codes. I ended up driving it the 5 minutes to work anyways and figured I'd look at it later after I got off.
8 hours later I started it up again, ran like a champ, no CEL on. The problem didn't come up again for 3-4 weeks.
So now, without fail, every month or so, I'll get the same issue. It doesn't matter if it's raining or sunny or cold or warm. But if I let it sit for a few hours, it'll act like it never happened.
Now, I haven't replaced the coil pack yet, simply because it doesn't sound like a coil problem, but I might do it just for the hell of it. New plugs and wires have already been done.
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Car: 2011 VW GTI MkVI
Mileage: 79k
Configuration: Stock
Warranty/Coverage: None
So I started my car last Monday and the check engine light was on. Didn't think much of it because the car ran fine and there were no immediate symptoms. I was busy with work this week, but noticed some changes in the car's performance over time so I waited till Thursday to have it scanned at AutoZone, which threw the following codes:
P 300 Definition: Random Engine Misfire
Explanation: Lean air/fuel ratio
Probable Cause: Ignition system misfire condition, Fuel injector fault, Engine mechanical condition
P 302 Definition: Cylinder 2 Misfire
Explanation: Vacuum leak on engine
Probable Cause: Ignition system misfire condition, Fuel injector fault, Engine mechanical condition
P 303 Definition: Cylinder 3 Misfire
Explanation: Vacuum leak on engine
Probable Cause: Ignition system misfire condition, Fuel injector fault, Engine mechanical condition
Prior to making any purchases I noticed that I started losing some pickup, primarily in lower gears between 2-3k RPM's. Praying that it was somehow just the coils/plugs I bought the R8 pack for both and replaced them this evening. Engine starts up and continues to misfire. I have not had a chance to have it scanned but it would appear it isn't the plugs or coils.
When the plugs were removed, there was an 'oily' substance on the threads, which also seemed like it could have been burnt off fuel or oil pushed up from the cylinder. Also 2 of the plugs seemed looser than the others and didn't feel properly sealed. New R8 install included proper plugs for STOCK application, as I do not run any tuning, and i installed with the appropriate plug grease added lightly to the threads.
I took the car for a spin with the R8 coils/plugs installed to compare it to how the car was doing prior the install. Car misfires and seems fine (relatively) at idle and revving to 2-3k rpm yields NO change. It is almost unable to accelerate up a hill, or go past 30 MPH without the car shaking and any gear higher than 3rd seems not drivable. I feel these are my potential diagnoses before i bring it somewhere and have it looked at.
In Order of Most Likely:
1) Fuel Injectors
2) Air Intake
3) High Pressure Fuel Pump
4) Electronic Leads for the Coils
5) Battery Needs Changed
6) Chain Tensioner Failure
7) Coils and Sparks are all Bad, and I am an idiot
I would prefer to do this work myself and can afford the parts. I just didn't want to be fooling around all month without a mode of transportation to get to and from work.
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2000 Jetta MKIV ... 2.0L GL
I've been dealing with random misfire codes on my Jetta (P0300, P0301-P0304). I've since replaced the spark plugs, wires, fuel filter, MAF senor, & camshaft positioning sensor but the problem still persists. The misfires occur right on start-up and don't stop which is leading me to the coil pack being bad.
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So I picked up this 24v vr6 in florida and it has the folowing codes:
p2181 malfunction in cooling system
p0303 misfire in cylinder 3
p0305 misfire in cylinder 5
p0300 random multiple misfires detected
p1570 engine control module disabled
I am thinking the ecu is fried? otherwise why else would that last code pop up. misfire codes im assuming are related to the ecu because theres new COP on each cylinder, newer starter, newer alternator, new spark plugs. Cooling system malfunction im thinking could be the ECT sensor, apparently the water pump was replaced a little while back.
If the ecu is fried can I buy a new one chipped from like APR or do they need the existing ecu and then they modify it?
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I have a 2004 Jetta 1.8t 6speed, I recently bought it from a person(my first VW ever) so just trying to fix some things on it, One thing that I'm stuck at is My CEL, it keeps flashing the code P0501 and some random misfire on my cylinders, I have reset it and they keep coming back.
when I put about 10-15% throttle it revs up fine, no misfire or hesitation until the fuel gets cut off around 5500, which is 1k below factory red line, does not hit a thing like the rev limiter where it pegs off the top multiple times just fuel cuts off.
If i put anything above the said pressure the car then begins to misfire and lots of hesitation and that's what causes those codes to go off.
I've been reading many things pointing towards the engine speed sensor or the wiring. Occasionally my fuel/temp gauge quit working but I believe that is a separate issue all together.
So really trying to narrow down what is actually causing my engine to hesitate at low rpm.
Also i might note when I'm in neutral I can go wide open throttle and the car revs fine until the cutoff and only does the bog down when it's under full load. It sorta feels like the possible misfire is due to bad air/fuel but really do not know.
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Just replaced all 6 plugs after getting p0300-p0306 codes. Still getting all codes, always starting with p0305. Was told coil was bad cause the shop only was getting p0305, but I have all misfire codes. We have over 95k on it, have owned since 2008. Its the 2.7 in it.
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Okay vortex here's what's happening in my 20th. About a month or so ago a CMP sensor went out, so I replaced that with a OEM sensor, on my way home my car started to misfire. So I took it easy the rest of the way home. The next day I started my car up and there were no misfires, drove to school, still no misfires but the check engine light was still on from the night before, after school on my way to get the codes ran it started to misfire again but then it stopped a few min into the drive.
Ever since then it has misfired but not all the time but maybe 1- 2 times a day then it would stop misfiring after a few min/seconds. My and my friend did the coil pack test and all the coil packs were good, yesterday (10/14/10) I replaced my plugs with NGK BKR7E plugs gapped at .028, my car is chipped with unitronic stage 2 tunning and it still misfired. I am going to clear all the codes and restet my ECU, but can you till do that with a unitronic ecu?
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I have a 2001 1.8T Passat. I bought it used recently and have had tons of problems. I have been getting a lean air code for some time now and I think I recently resolved that. I had to replace a few vacuum lines, MAF, exhaust flex pipe (it was broken), fuel filter and fuel pressure regulator. The car was still running bad and throwing a lean air code (Bank 1) so I finally changed the O2 sensor and I think that did the trick. Now every time I start the car I get misfires until is warms up. I get misfires on all cylinders along with the multiple misfire code.
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My 2000 Excursion, 6.8L V10 misfires when I try to start it, after a rain storm, and for the longest time, I could not figure out what was going on. After much use of a garden hose, to make rain, I found the rear two cylinder wells, on passenger side fill with water, due to a design defect in the engine hood that causes run off down that side of the engine. I visited with a mechanic, and was told that the hood design is common to a lot of the F series trucks, and the 8 and 10 cylinder engines are prone to the water buildup in the passenger rear spark plug wells. I am going to try to put a shield of some sort, around the two cylinder wells, to divert the water.
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I'm getting Codes: P0300-306 (Misfires) and P0356.
I have researched the definitions of these codes and see that P0356 indicates an ignition coil failure on coil "F" (which would be Cylinder 6?)... but how is it possible only one coil is failing but I'm getting multiple/random misfires on all cylinders?
I've looked at the wiring diagrams and the only place that I can see a "single point failure" that can cause such a thing, would be the ECM itself...
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I have a 2006 Chrysler Sebring Convertible 2.7L engine. Replaced water pump and spark plugs. We triple checked the alignment on the chain and are sure the timing is fine. Car started right up. Now running rough idle and engine light comes on. Codes read misfires on 1, 3, and 5 cylinders.
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I know the ignition coil are a big thing but I'm going to be buying this car this week and so I need to see how much less to offer the guy because of this issue. Is there anything other then the ignition coil that it could be? What's worst case scenario? And also would it be ok to drive it home about 60 or so miles with this going on? I'm guessing it's doing the misfires at idle.
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Random multiple cylinder misfire according to auto scanner report on a 2002 Passat 1.8L? I have recently changed all belts including the timing toothed belt. I have had this very same problem prior to changing all belts on this car. Mileage is 111,000 ....
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