Golf/GTI VI :: Vibration And Misfire During Cold Start


Aug 1, 2013

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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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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I've had my 2010 GTI for 8 months now and have really only had one issue with it. When I start the car, it shakes before I start moving. Like, the steering wheel, body, pedals, gearshift, etc... It's not a violent shake, but definitely something I've never noticed in any other car I've owned including my MkV GTI. It doesn't seem like a normal feeling for a brand new car. I took it back to my original dealer at 4,000 miles and they said there was nothing wrong with it and they didn't feel any vibrations.

Well lately it's been vibrating more intensely and more often (at almost 8,000 miles) It now does the same thing while stopped in traffic or at lights. It's really annoying to me. I took it a couple days ago to a new dealer (I moved) and just talked to them on the phone. They also said there's nothing wrong with it and it's normal.

I forget exactly what they said it was because I was walking to the gym, but basically it was some cooling pump/fan that kicks on to cool the engine down and that's what is causing the vibration. But, they said it's normal and all VWs do it. I'm not quite sure why a fan needs to cool a perfectly cold engine in the morning though.

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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
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Having trouble on cold starts, takes about 10 minutes to finally get it to turn over. When it does the idle is extremely rough. For the first 1/4 mile the car bucks, stutters, and misfires. After that it runs fine and starts fine when already warm. I am noticing slightly decreased gas mileage but nothing major.

Valve cover gaskets were replaced 2 months ago, but were leaking oil for at least a year before I could afford to have them replaced. I am still noticing some oil leakage, however not as much as before. I have had both O2 sensors replaced twice in the past 5 years. Timing belt was replaced at 98k. What might be causing the starting issues?

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Having a rough idle on a cold start. After some research and closer inspection of the vehicle, I'm quite certain I have at least one leaking injector that is flooding a cylinder and causing the car to misfire on a cold start. I'm also not at the gas mileage I should be at.

So I'm wondering, is fuel injector replacement as straightforward of a job as it looks? Any major issues I could run into in doing a replacement?

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