Passat (B6) :: Shakes At Idle - Multiple Random Misfires
Aug 17, 2009
So I took a trip from Dallas to Florida, and on the way back my check engine light came on. The car shakes at idle, almost like it wants to take off. I drove it back to Dallas like that since the car runs normal on the high way. I got it scanned at autozone and the code said it had multiple random misfires. I'll be taking to the dealer in the morning, but what it could be? The car jumped over 50K during the trip hopefully the dealer will be nice and cover it.
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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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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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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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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 left the key on and drained my auxiliary battery(It was weak before) and when I jumped it it started and then shut off after ~20 seconds. I tried various different things and all I succeeded in doing was draining my HV battery from starting it so many times. So I disassembled the pack and recharged it and now it starts and runs but it is misfiring. It throwing 4 codes:
P0300: Random/Multiple Cylinder Misfire Detected
P0302: Cylinder 2 Misfire Detected
P0304: Cylinder 4 Misfire Detected
P1305: Ignition Coil 2 Primary Feedback Circuit
I inspected the igniters and plugs and they seem to be OK and I'm not sure where to look next. I'm not sure if the battery issue is related or not but I did replace the auxiliary battery.
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I have spent alot of time looking through threads about v10's misfiring and have not been able to resolve my issue. I recently purchased a 2000 v10 f250 with about 220000 miles on it I bought it knowing it had one miss fire but now I have a total of three. Te truck has no problems accelerating but at a little over 40 mph the engine shakes quite noticeably and after 60 i5 seems to smooth out. After alot of reading I replaced all of my plugs and ignition coils, ran a can of sea foam through my gas tank and my intake with no change to the miss fires. I have started my trials with the fuel injectors by switching them from miss firing cylinders to ones that aren't. Some other information is my truck has no egr on my intake.
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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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Getting multiple CEL's for the catalytic converters and cylinder misfires. Looking for threads that address these particular codes ie. 0431, 0421, 0300. 0303, 0306. I have a feeling that these are being caused from a vacuum leak and/or needing a reflash for the ECU.
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My daughter has a 2003 Passat Turbo. Two weeks ago it started to run like crap with a check engine light on. I pulled the codes and it said multiple misfires. My buddy owns his own shop and said bring it down. He pulled the plugs and the spark plug holes were filled with oil. He changed the valve cover gaskets and replaced the plugs. Still ran rough with low fuel pressure so he replace the fuel pump and injectors. Still runs rough, when he pulled the air intake off there was oil in it. Could this have happened do to the valve cover gasket? The codes still read misfires. He said the turbo was full of oil also. Could the turbo be bad causing it to run like crap? Can it be rebuilt? I really don't want to go to the dealer.
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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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Ok so I have the 2009 f150 4.6l 2wd. Have random misfire codes. Horrid idle. I replaced all of the spark plugs, coil packs, and even the injectors on 1/3/4. Still codes nothing is better. I'm thinking maybe an intake manifold leak,? I see no real signs but I do hear that little pop pop pop. Now I have a gasket kit for it but I see you can order complete manifold kits with thermostat and gaskets on amazon for like 60 bucks more. The issue is I see none that fit my truck. Is it the same as the mustang? Hate to blow more cash as its adding up.
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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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What is going on with my sisters passat 2002 V6 GLX Auto 4Motion. Here is the codes:
16730-Camshaft Position Sensor (G163) Implausible Signal
P0346-35-00
16684-Random/Multiple Cylinder Misfire Detected
P0300-35-00
16688-Cylinder 4: Misfire Detected
P0304-35-00
16690- Cylinder 6: Misfire Detected
P0306-35-00
16689-Cylinder 5: Misfire Detected
P0305-35-00
I changed Both sensors and it still same problem. Car only has 40,000 miles didnt change timing belt.
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my car was running fine yesterday. Today the check engine light came on and it started to run funny.. I checked the diagnostic code and it says the the cylinder is misfiring and that oxsygun sensor is malfunctioning. (Random/Multiple Cylinder Misfire Detected)
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I have a '06 Passat 3.6. I had the intake and valve cover off the other day and when I put it back together it started missing bad. The code it is throwing is a P0300/ random/multiple engine cylinder misfire. What is wrong?
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I was driving along and the engine started missing really bad. The whole car was bouncing around. At first I thought I had a flat, but when I stopped I noticed it was the engine. I checked the error codes and got 16684 and 16686 --- Random/Multiple Cylinder Misfire.
I had a problem recently with the vacuum hose broken and was causing an error code. Replace the hoses and it has been fine. Checked to make sure that the hoses were secure and they are fine. Doesn't seem to me to be related. So many problems for a car with 57,500 miles
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2005 prius. the car is pulling three codes misfire cyl1, misfire cyl2, and multiple misfires. The car has over 450000 miles on it and runs like a dream. I just replaced they spark plugs and the coil packs in each cylinder. The cel codes are still there after clearing them. I am willing to replace the fuel injectors but just seems weird that two of them would go out like that together.
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I have a 2000 lc 1.5l ... I just rebuilt the motor machine shop work and all it Will start and run for 3 seconds and then die. If I hold the gas pedal it will run but sound rough and as soon as you let go it dies I have been able to get codes multiple misfires, misfire cylinder 1, misfire cylinder 2, and misfire cylinder 4 I have put brand new plugs (copper core ngk), wires coils, crank sensor, cam sensor, iac, tps, maf and the injectors all have new orings it also has ntk o2 sensors that might have 1000 miles on them...
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I have a 97 Pontiac Grand Am GT 2.4L Quad 4, my problem is that it misfires and the engine runs rough. You can smell fuel, but there is no fuel leak. I have about 155k miles on the car, never had no serious issues with the car, the car has been great, I’ve owned it since early 2000. Little history on the parts I’ve replaced this year is the following spark plugs x3, spark plug boots x2, timing chain, Timing chain tensioner, camshaft positioning sensor, throttle positioning sensor, fuel pump, fuel filter, air-intake manifold gasket, throttle body gasket, IAC, ignition coils, ignition coil housing, ignition coil wiring harness, swapped the Ignition control module, checked the fuel injectors for solenoid clicking, replaced water pump, thermostat, swapped EGR’s.
Maybe some other parts I can’t remember but I have done a lot trying to figure this out. Also took it to a garage and told them what I have done and the first place they looked was the fuel pump and said it tested at 20psi and called for 40-60psi so they replaced it and problem was still there. They had it for a week and half and couldn’t figure this problem out. Thinking about replacing the ignition coil housing again just to see maybe bought a bad one. Also done the three checks for head gasket blown, milky white oil, anti-freeze bubbling from the reservoir and compression check, all checked out fine. Ran gunk fuel injector cleaner through it several times.
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When I start my 1999 1.8 petrol passat it needs some throttle to start, low idle speed, misfires, drop in idle, so boot the throtle full - still no pick up and sits on 1000 rpm busy backfiring away! It started after fitting a new windscreen wiper motor, battery was disconnected but went back ok, all other electrics work and no warning on the dash. Didn't touch anything in the engine bay nor were there any issues before I changed the wiper motor.
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