Surging Issue... at idle and when driving. arghh.

Huw Powell audi at
Tue Mar 17 12:57:18 PDT 2009

Hayes Myers wrote:
> Was having some cold starting issues (wouldn't hold idle and would stall
> sometimes).   Put in replacement ISV and all was well again... been just
> over a week since putting isv in .   Just now car started to 'surge'. it
> will idle up and down rapidly at the lights... and will surge even
> driving... up/down up/down.  WHen you upshift the revs were not dropping
> recently (ie: seemed to be 500rpm too high...revs didn't fall off)... now
> they actually increase.

If your car has an idle switch, check to make sure it's still working. 
If it isn't (ie, staying "open"), your ECU won't know when to use the 
ISV to make a smooth idle.

Although, this doesn't address the surging while driving...

Huw Powell

More information about the quattro mailing list