Date: Sun, 17 Nov 2002 17:13:24 -0800
Reply-To: Scott Wilson <smorewhisky@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Wilson <smorewhisky@YAHOO.COM>
Subject: Re: low compression\rough cold idle-1.9L
In-Reply-To: <002b01c28e7c$b9ff4b40$97e579a5@here>
Content-Type: text/plain; charset=us-ascii
my van has the two switches, i replaced the throttle
valve/deceleration/idle switch(according to bently).
adjusted it per bently, van runs good, when warm...
i have a new temp 2, although i got it at napa,
italian made, should probobly test it...new aux air
regulator, and it has juice, tested yesterday. year
old idle stabilizer, color of white, bently says black
or green, old one was green.?. year old fuel pressure
regulator. ignition wires test good. good cap and
rotor. fuel injectors good. new afm, co set by o2
sensor voltage. running out of ideas myself. next
thing i think i will do is take the entire air intake
system off and make sure everything is air tight...i
fear this will have no effect and give me a backache
so i guess im fishing for ideas...thanks for the info
scott w.
>
> back to the original problem ... new throttle
> switch.
> hmmm. did you adjust it properly?
> remember there are TWO switches built into that one
> (if
> yours is an early model. later 85's had two separate
> switches). and one tells the computer when you are
> at
> idle so it can keep the rpm up. the other tells the
> computer when you are at full throttle so it can
> richen
> the mixture (to keep from burning a hole in a piston
> by
> being too lean).
> if the switch(es) aren't adjusted properly, after
> the
> bus warms up (gets off the cold-start cycle), the
> switch could be telling the computer bad info. like
> telling that it is NOT at idle when it really is ...
> in
> which case, the computer assumes (wrongly) that it
> doesn't need to do anything to the idle and you'll
> stumble and stall. if the full-throttle switch were
> badly adjusted, the computer might be told you ARE
> at
> full throttle when you are not, and too much gas
> would
> also cause stumbling and stalling.
>
> but it could also be a coolant temp sensor .. it
> also
> tells the computer when the engine is cold. if it's
> dead in 'warm mode', the computer never thinks the
> engine is cold so it never gives any cold-start
> extra
> fuel. same thing with the aux air regulator ... it
> provides extra air for the extra gas at cold-start.
> if
> it's stuck closed, the engine isn't getting enough
> air
> and will die.
>
> but i'd check the throttle switch adjustment first
> ...
> that's the most logical suspect, since it's the
> thing
> you changed most recently. :)
>
> good luck!
> joel
>
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