Strange misfire 01 audi a8

[Mike]

Anyone have any idea what would cause a misfire in park and only when i rev up to 5 or 6 k…misfires in cylinders 3 and 6 for 10 seconds or so then it smoothes out…car does burn a lot of oil

Topic

[losercomet]

Check the plugs on 3 and 6 and see if they are fouled and check the gap

[college man]

start with the suspected cylinders. it seems to do it under load. you can check spark and injector pulse to see
whats missing. unless these two are oil fouling and then clearing out.C8-)

[johnzcarz]

+1 on pulling the plugs and taking a look. Are the sparkplugs on the Audi 8cyl buried like they are on some small Audi/VW’s so you need that special ‘corkscrew’ tool to get at them? Hopefully not.

[Mike]

The plugs are easy to get to. They are brand new and you cant gap them. It was misfiring all the time before and it had 7 bad coils. So that fixed that problem. Now it does this. So new coils, new plugs, i have not checked injectors. I did pull cyl 6 plug and it had a little oil on electrode, but it didnt look too bad. Oh ya…compression is really good too.

[college man]

Quoted From Six6vetteguy:

The plugs are easy to get to. They are brand new and you cant gap them. It was misfiring all the time before and it had 7 bad coils. So that fixed that problem. Now it does this. So new coils, new plugs, i have not checked injectors. I did pull cyl 6 plug and it had a little oil on electrode, but it didnt look too bad. Oh ya…compression is really good too.

what type of pugs are you using that you can’t gap them?
If your using a bosch 4 or something close to it. I’m going to suggest that you replace them with ngk or what the car calls for.
if you don’t find an injector problem I’m leaning torward the plugs being your misfire.C8-)I’m going to suggest a power balance test

http://www.youtube.com/watch?v=bAOmUjAjNjE&feature=fvsr power balance

[dreamer2355]

I would also suggest stress testing the ignition coils on the suspected cylinders.

However, if the plugs are fouled with oil, you may want to correct that issue whether it being a valve cover gasket issue or possibly a valve stem seal.

[Mike]

It calls for bosch.

[college man]

Quoted From Six6vetteguy:

It calls for bosch.

do you have the 4or 2 in there. the only reason I ask is I tried the four plug before
and the car ran bad from the get go. I put the original plugs back in and the car was
smooth again. If the car uses bosch.get the regular platinum tipped.gap them and see if
the miss goes away.If you still have the old plugs.swap them out on the suspected cylinders.
see if the problem gets better

[Mike]

Thanks…i will try that

[EricTheCarGuy]

I think ScannerDanner has a video on a very similar problem.

http://www.youtube.com/watch?v=fp_XZm-8nrA

[Author]

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