Q: Car Revving in Idle. Performance not affected.

Hello,

Over the past few weeks my car has been revving in idle. It also tends to run just below optimum engine temperature. Engine management light was on. Temperature gauge tends to be just left of mid-line. I brought it to VW dealership to have it assessed. They diagnosed the problem as being the Throttle Body. Cost 735 for part and labor. Price in Euros as I'm writing from Ireland. However, when I got the car back it was the exact same way!! Except the engine management light was off. They took it back and then said it was "Breaker Valve on Rocker Cover". They replaced this. 190 Euro. I spoke to the mechanic and asked is he sure that the Throttle Body had a problem in the first place. He explained that a faulty Throttle Body can affect this Breaker Valve on Rocker Body. Does this sound ok? I just feel that the throttle body was not the primary problem. I have the old one so I could get it checked out. Car still driving great.

Thanks for taking the time to read this. Cormac Cawley

My car has 180000 miles.
My car has a manual transmission.