Phaeton :: Cold Start Misfire For 10 To 20 Seconds
Dec 30, 2013
The last couple of times that I've started my W12 after sitting over night or longer I've noticed a misfire for 10-20 seconds and then it cleans up. Today the engine icon illuminated and after returning home I ran a VAG-COM scan which revealed these DTC's. There are 7 found faults at address 11.
My question is this- What exactly is causing this misfire issue? I'm assuming there is a faulty piece under the hood begging for attention but I don't know which item it is.
Everything else seems to be performing as it should but I see a few other faults showing up. Are any of those faults anything that needs looking into?
VCDS Version: Release 11.11.6
Data version: 20121223
Chassis Type: 3D - VW Phaeton
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Summary of Events:
Lower radiator hose decided to disconnect itself.
Stopped and had car towed home.
Connected hose and filled coolant system.
Car is hesitant to start and takes a couple seconds of cranking.
Misfires in cylinder 3, and a few in cylinder 5, no other codes.
New OEM plugs, no change.
Swapped coil packs around, no change.
Idle is rough but at speed, everything is smooth.
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2000 5.4l lariat. My cylinder 1 for 2 years has been poping p0301code and has a rough idle at start for about 30 seconds. It also has a little white smoke for that 30seconds. new cop, new spark plug, new spark plug pig tail, swapped injectors to different cylinders multiple times to change code no luck. Compression dry and wet are at 200 and all cylinders are within10%. I had a dorman intake manifold installed 4 years ago and the code came a few years after. Im thinking intake manifold gasket is bad between cylinder 1 and the heater bypass tube allowing coolant to slowly leak down into the cylinder causing my rough start. I looked through the injector hole but could not tell. With all the info I have given is there any other places or things that it could be before I do a gasket replacement or is all my tests leading to the intake manifold gasket...
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Bought a 2006 (later production) with 25,000 miles over the weekend. Couldn't pass up the price and the warranty (1 year left + CPO). Picked up the car Saturday at noon..... had to drive to DC for business and the CEL came on when I turned on the car this morning. I researched at lunch that it could be a cold start misfire but I am already pretty heated about this. When I get home tonight I am going to plug it in to my OBDII scanner and see what I can pull. If it is something bad.... I am giving it back to the dealership.
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Couple months ago I noticed that my car was experiencing rough idle, stuttering exhaust note during cold start. RPM is very stable!
Forward 4-5 months to last week, starting to notice vibration and it seems like the situation has gotten worse. The car returns to normal after 1 minute or so depending on how long it has been sitting there for. For example, If I park there for 30 minutes and try to start the car, I can feel a little vibration for up to 10 seconds. If it was parked for overnight, then the problem lasts up to one minute and then clears out. Now it's throwing a P0302 error which is cylinder 2 misfiring.
It's really like magic, the car would idle pretty rough and suddenly clears out.
I put in 4 brand new ignition coils and plugs, all OEM stuff and still hasn't worked.
This problems started during the winter time and I can clearly notice it's gotten worse and finally last week it threw the misfiring code.
I feel like something is failing or building up slowly. My car is a 2009 GTI TSI which has the same engine as the MK6 GTI.
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Ok after finding out I had a bad battery @ Toyota shop they also say the scan is reading an exhaust leak ( I could hear that one ) they also say there is a misfire on cold starts should I worry and what could it be or is it a misread from the other two ?
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Two months ago I bought a used 2006 Sonata v6 with 54,000 miles. After a few hundred miles I began to hear a rattle on cold start that lasts approx 5 secs. I did my research and saw the TSB concerning the timing chain tensioners. The TSB instructs the dealer to turn the engine off after reaching operating temp then restart after 10 minutes. If there was no noise after the ten minute start then the car is operating normally. My car does not rattle after the 10 minute start up. I just can't see this as a normal characteristic. What could be causing this noise?
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I have a 2009 VW GTI 6spd (42k miles) that has been misfiring at idle for about a month now. I can feel the engine shaking and see the CEL flashing at 900 RPM and eventually an EPC light comes on and makes the car run very sluggish. The EPC light turns off if the i turn the car off and back on. The car runs fine and without any misfires after start up which has me stumpted as to what it could be.
I've taken it to San Tan VW in Gilbert, AZ 3 times.
1st time they said it needed a 40k mile service to correct the misfire which included oil change, fuel filter, air filter, spark plugs, fuel injector clearner and a tire rotation They said spark plugs was causing the misifre so i replaced the plugs but the misfire was still there.
2nd time they said the injectors have carbon build up and recommended to run 2-3 bottles of fuel injector cleaner + octane booster per tank for about 2 tanks and that will fix the issue. That didnt work either.
3rd visit they came to the conclusion that it had massive amounts of carbon and needed a "walnut blast". They recommended to look else where for cheaper labor rates on the blast.
Also, need to understand why the car only misfires at 900 RPM if there is carbon deposits at all times.
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For some reason every time I start up the car the air con has reset itself to "low" resulting in me being blasted with ice cold air no matter what it was set to when I got out.
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I have been having trouble with a hard cold start on my W12. when I go to start the car it will crank and crank I can hear it fire on a few cylinders but is not starting on the first try. It will then fire right up on the 2nd try and is fine when it is warm. I had it into the dealer and the replaced the battery in the key and cleared the misfire codes they also did the coil pack swap. I am still getting the hard starting...
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2014 se , 7k miles. Get a pretty noticeable sound. its hard to explain its kinda like a grumble for about two seconds. on very cold weather starts.
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On a very cold start, overnight, temps are zero or below the car starts okay but sounds rough for a few seconds and lets out a bad smell. Almost like it stumbles at first then is rough then goes normal cold running. Car is at 40k miles.
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A minor but persistent (year-long) rough idle on my 1991 240 has quickly turned into a Cold Start Nightmare over the past month:
SITTING HOURS OVERNIGHT (50 to 60-degree temp. overnight) - When I attempt to start in the morning, the engine idles high for 3-5 seconds and then immediately dies. To successfully start, I must keep pressing the accelerator pedal at least half-way down for 2-3 minutes. The engine sputters, almost backfires, shakes, lopes, almost dies, etc. After 2-3 minutes, everything runs just fine.
WARM ENGINE SITTING - Once the engine is warmed up, it will consistently start without problems. Still a slightly rough idle, but OK. The car does not die.
I have changed the battery, coolant temp. sensor, and spark plug wires.
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It rattled very loud for 1 or 2 seconds on a cold start the other day too. Noise appears to be coming from the engine. It does it pretty much all the time, at idling, when I accelerate it accelerates too and when I slow down it kinds of do too slowly. Need another new short block or is it something else like the timing chain or a bearing?
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