Hi all,
I've got some idle problems with my A4 1,8TQ -98, when engine is cold it idles with about 1000 rpm, when engine warms up it idles between 1200-1600 rpm. I've cleaned the thorttle-house and it's been recalibrated since that I've also been checking for vacuum leaks but there wasn't any. The car is running normally except for the high idle, what could be the probblem? Please help...
/Kaj

 

Check all you sensors. Sounds a little weird. It's usually idling low problems.

 

Unplug your maf and see if the idle goes back down to normal. Pull back the rubber seal on top of the airbox to expose the maf plug. Is your K&N a panel or cone filter? Could be your maf, intake air temp sensor, or engine coolant temp sensor. Have you had your battery disconnected lately?

 

Yes, battery has been disconnected but, but there was too high idle before that too...
/Kaj