How to find vacuum leaks

[Huw Powell]

> Correct me if I'm wrong but isn't the stalling directly related to the
> removal of the oil cap or dipstick? In other words, isn't THAT your vacuum
> leak?

Rob is correct, you have it backwards.  engine runs fine capped, stalls
when uncapped, tends to indicate *no* vacuum leak.

If it didn't stall (and this is trueer of turbo's than NA, btw), then
its already been adjusted to compensate for excess air and the
cap/dipstick test *does not* stall it since its not enough extra
unmetered air to lean it out to the point of stalling...

> > Finally got my coolant expansion bottle, installed it and while waiting
> > for the cooling fan to come on during the bleeding, I decided to do the
> > dipstick test to see if some of the stumbling and hard starts might be
> > vacuum related. Well, pull the dipstick, it stutters, loosen the oil cap,
> > stutters worse, lift the cap, it finally stalls. Soooo, I have a vacuum
> > leak. The problem, I can't tell where. The hoses I checked so far look
> > good, I know I do need a valve cover gasket, but I can't tell if it's
> > something else (it seems from the dipstick test that the leak is likely
> > more severe than a mildly seeping valve cover gasket!). I recall someone
> > on the list saying something about propane, but I'm not so sure what they
> > said...

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/