re. 5kcstq engine problem when cold

[Swann, Benjamin R. (BSWANN)]

Wallace,

Yes, probably, and in my case probably not.

I say this because mine drops, bounces and promptly resumes a steady idle at
800RPM.  This is probably because I have the idle screw adjusted to far in
with a shot O-ring, a non-problem for me now, until my ISV goes on the
fritz.

A good ISV cleaning oughta do ya, and you'll probably want to clean all of
the muck out of that crankcase vetilation hose, while your at it.

Regards,

Ben
-----Original Message-----
From: Wallace White [mailto:wallacewhite at yahoo.com]
Sent: Monday, December 04, 2000 1:35 AM
To: Swann, Benjamin R. (BSWANN)
Cc: 'one at humanspeakers.com'; 'quattro at audifans.com'
Subject: Re: re. 5kcstq engine problem when cold


Ben and Huw -

You know, I bet it's the ISV in my case. It must be something not
letting enough air in, rather than a vacuum leak, since the revs drop so
quickly when I change gears. Isn't the ISV the only thing that _should_
be creating a vacuum leak (so to speak) that might not be doing its job?
Makes sense to me.

- Wallace
  '87 5kcstq 167k

> >so long as it is closed when your foot is off the gas it is fine.  just
> >tells the ecu to cut fuel, and use the isv to control the rpm's... so,
> >is your ISV sticky perhaps?
> >>
> >> It is almost new.>
> >>
> >> <check the functioning of the idle switch?
> >>
> >> > I may be haveing the same or similar problem.  Engine slightly warm,
> cold
> >> > outside ~ 30-45F.
> >> >
> >> > Upon letting off the gas, the engine drops to about 300 RPM, like it
is
> >> > going to stall, then recovers.>>