Hi,
Does the '97 A4 1.8T have an idle control valve? I've searched the forums, but only see info on the 2.8 engine.

My A4 won't idle unless I manually give it some throttle. Previous to this problem, and for as long as I can remember, the idle would drop to ~500 then return to ~900 when returning to idle...even if the throttle is pressed slightly, revving it to 1100.

Thanks!

Greg
Chicago
1997 A4 1.8T Q

 

On my 1999.5 this function is performed by the electronic throttle... although in my transition year, it's not drive by wire.

 

Had an idea: remove the intake boot to the manifold and spray the throttle blade with some carb/choke cleaner. Engine off. Move the butterfly the full 90 degrees and spray so it's clean on both sides. It's gonna start pretty hard once you get it running, I would still rather run it though tho, be sure to get a cleaner that's safe for o2 sensors.

 

^^^^^^^ He's 100 percent right.

Clean the TB, that will fix your erractic idle, I had the exact same issue on my 97 1.8t.
just use regular carb cleaner, nothing else.

 

Thanks for the info. On slight difference in symptom: in my case, the idle isn't erratic, it's that the engine simply won't idle unless it's given some throttle.

Will cleaning the TB address the "no idle" condition, or should I be looking at something else? I'll actually find out tonight... after I clean the TB....