"Bernd D. Ratsch" wrote:
> To check for a vacuum leak, the easiest way is to grab a can of carb-cleaner
> and (lightly) spray around the base of the TB and intake manifold mating
> surface (where it meets the heads). If the idle goes up, you've got a
> vacuum leak. (If the idle goes down, you've got a vacuum leak and it's
> running rich as well.)
Disagree here as idle is a closed loop condition and therefore A/F ratio is
COMPLETELY controlled by the pcm based on the feedback from the O2 sensors. It
really doesn't even matter if you have a vacuum leak (or an internal fuel leak
for that matter). The PCM will compensate by adding more fuel whenever the O2
sends a LEAN signal. This happens in a matter of milliseconds so you will never
even notice it. If it were a bad leak - you'll get a check engine light.
Its a hard pill to swallow I know. Been there done that.
Latr,
Shane
-- '96 IndyRam-HisIndy-MPI/TB/Pulleys/AccelCoil/MPComp/HookerSuperComps/CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:59:53 EDT