Question about 2001 Audi A6

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Hi I have an A6 2.4 V6 Avant. Done 120k km's. Just had 120k service done - change toothed belt etc. No it shudders or stutters as you accelerate. It settles done at higher speed by the moment you gun it it will stutter. Have also had the gearbox chain and pistons replaced at 120k in the 6 speed multitronic box. Spark plugs ok. Timing ok. Full filter replaced. NO ERROR messages. Could this be an airmass sensor or what else should we look for? For a silky smooth car this is most concerning. Thanks

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Hi

it could well be the air mass sensor, try cleaning it with carb cleaner, this often works
the other thing is, as you have had the timing belt done the crankshaft sensor may be at fault causing a slight missfire internitently, other option would be the camshaft sensor.

you should normally get a code for the air mass sensor but if the fault is not constant then it might just evade you. Lastly does this car have the EGR valve, some do some do not ??

Regards
Dan

Posted on Jan 01, 2011

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