My engine would flat-out quit if I stuck my finger over the inlet
instantaneously. However, if I gradually closed the inlet over a
period of about 1 or 2 seconds, then the engine managed to adjust
good enough to stay running. However, with the vacuum leak corrected,
the idle speed dropped back down to where it's supposed to be, and
my good ol' intermittent stumble/stall condition came back. I think
my vacuum leak/increased idle speed just became an involuntary fix
for the stall condition.
The pcv valve has recently been replaced. However, I still have to
clean the TB and replace my IAC - I'm hoping that'll solve the idle
problem.
thanks for the input
kevin d.
97 cc V6 5sp
>
> Date: Fri, 09 Mar 2001 08:21:08 -0600
> From: "Bernd D. Ratsch" <bernd@texas.net>
> Subject: DML: RE: Vacuum leak - Missing Cap - V6
>
> That's exactly why it died on you (after closing up the vacuum leak).
>
> It was running too lean as is and the computer was
> compensating by adding
> fuel and (just about) closing the IAC port (via the
> solenoid). Once you
> plugged the hole, you introduced a rich condition and the
> computer took a
> little bit longer to adjust. That happens...no biggie.
>
> That would probably be the best step since who knows how long
> it was driven
> without the cap (long term fuel trim was more than likely
> affected by this).
> Reset the PCM after replacing the vacuum cap.
>
> - - Bernd
>
> - -----Original Message-----
> From: owner-dakota-truck@buffnet.net
> Subject: DML: Vacuum leak - Missing Cap - V6
>
> My thoughts.......if there is supposed to be a cap on this thing, why
> would it die when I put my finger over it??? The pcv valve
> is the first
> thing in my sight, so I give it a shot in the dark and go buy a new
> one. I install the new one and start the truck up. I again put my
> finger over the bare fitting (where the cap should be). Again the
> truck stumbles, but what do you know....the truck recovers
> and does not
> die! I repeat this twice more with the same results.
> Now, I think if I reset the computer, replace the missing cap, and
> drive the truck for a couple hundred miles or so, everything will be
> fine.
>
> It seems to me that the truck would have been running rich with the
> vacuum leak??? Would this be the case? - seems to explain
> why it died when
> I covered the fitting. If so, if I cleaned the TB
> good, replaced the spark plugs (and wires too really), this thing
> should really haul a$$ AND get better gas mileage.
> So, to the guy who first posted the "missing cap" thread, try
> replacing your pcv valve along with the cap and see if it cures the
> stumble/die problem. Let us know how it turns out too!
>
> - --Aaron--
>
>
>
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