audi a4 RPM drops (LIKE A HICCUP) ??

Question

hello everyonei have a problem in audi A4 1.8T (2002). i hope some one can answer me and reallyappreciate it.what it does is....when u run the car some time and stuck in a traffic jam(or when idling), the rpm drops down suddenly and then settles down (this is like a hiccup).This does not happen all the time.Also some times I can see on my tachometer that rpm goes slightly up to stop the engine being stopped (something like dragging)I have been in audi and they replaced the air mass meter and it did not fix the problem.Then I went there again and they said the throttle body is cleaned. But the problem still exists.Please help me if someone came across this sort of problem.One gentleman already came up saying that he had a similar problem and cleaned the throttle body and set everything using vag com. But it did not cure it and found out that the split hose causing the problem.i am thingking of taking the car again to the dealer and get the hoses checked and if someone elase come up with anything else, i would be really greatful.Thank youLAKMAL

Tim.. · Accepted Answer

Tricky, - the garage has already performed the two operations that nearly always cause these motors to hiccup at idle- they are abit prone.

Ask the dealer to have another go at re-aligning the throttle body via the VAGCOM, and check the vaccuum hoses, and PCV system.

If this fails, you could be looking at a coil pack that is *just* beginning to go faulty.- but nigh on impossible to diagnose until it gets worse.

Tim..

Conor · Answer

Sometimes this happens when the cooling fan kicks in and you get a short drop in the revs as the alternator is suddenly presented with an additional few amps load until the anti-stall kicks in.

Mark W · Answer

Check all the ignition leads.I had a similar symptom which turned into a misfire and the last thing I checked was the ignition leads, to find one with a broken terminal.

Tim.. · Answer

This engine uses coil-on-plug.Tim..

audi a4 RPM drops (LIKE A HICCUP) ??

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