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Tough one to call

> OK,
> It is an 81 turbo and the engine idles
> erratically when cold and in drive(yes it is
> an automatic.) The thing is that when it
> warms up it idles fine, but then has less
> power. The engine just pulls like a champ
> when it is cold. So, what my question is if
> anyone can head me in the right direction
> without having to pull every sensor in this
> thing. I was personally thinking that it
> might be the water temp. sensor or possibly
> the Throttle valve switch, but am not sure
> if either of these sensors could cause these
> particular symptoms. All help is
> appreciated.

My '83 zxt had a similar problem. I broke open the book and went step by step checking every sensor in the **** thing. Finaly after a couple of days I found a vacuum line with a very small hole in it - bought a new line and haven't had that problem again. The bad thing about an 80's car is that it isn't as simple to diagnose as a 70's 350. eratic idle can be - bad vacuum lines, egr, camshaft, exhaust sensor, or even a cloged air filter, and probably one of a billion other things I've never heard of.
This engine however does run great when they are cold - but when they warm up several bypass valves open and close to activate other components - making it hard to find a trend. Sorry I couldn't be of much help to you, but, there are a few billion people on this planet - and they are all smarter than me. So maybe we can solve this one.
Dave
 

· Registered
Joined
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107,597 Posts
wouldn't hurt to check the timing

> My '83 zxt had a similar problem. I broke
> open the book and went step by step checking
> every sensor in the **** thing. Finaly after
> a couple of days I found a vacuum line with
> a very small hole in it - bought a new line
> and haven't had that problem again. The bad
> thing about an 80's car is that it isn't as
> simple to diagnose as a 70's 350. eratic
> idle can be - bad vacuum lines, egr,
> camshaft, exhaust sensor, or even a cloged
> air filter, and probably one of a billion
> other things I've never heard of.
> This engine however does run great when they
> are cold - but when they warm up several
> bypass valves open and close to activate
> other components - making it hard to find a
> trend. Sorry I couldn't be of
> much help to you, but, there are a few
> billion people on this planet - and they are
> all smarter than me. So maybe we can solve
> this one.
> Dave
 

· Registered
Joined
·
107,597 Posts
> OK,
> It is an 81 turbo and the engine idles
> erratically when cold and in drive(yes it is
> an automatic.) The thing is that when it
> warms up it idles fine, but then has less
> power. The engine just pulls like a champ
> when it is cold. So, what my question is if
> anyone can head me in the right direction
> without having to pull every sensor in this
> thing. I was personally thinking that it
> might be the water temp. sensor or possibly
> the Throttle valve switch, but am not sure
> if either of these sensors could cause these
> particular symptoms. All help is
> appreciated.
 
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