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Re: 4ks idle problems
I have an "85 4000S and I agree the Haynes manual is about useless for
the engine. Luckily I still have the Bentley's manual for my old VW Fox.
This Bentleys is good for CIS-E and only costs 30 bucks, but I'd suggest
biting the bullet like I soon will and get the right one.
As for your cold start problems, it may be as simple as the temp sensor.
Pull the plug when the engine is cold and check the resistance. You
should see about 1700-2500 ohms. If the sensor is broken, you may see
none, this will signal a warm engine, which will give the cold start
valve a very short injection time and won't enrich the mixture while the
engine is warming up.
Concerning the idle, you are right to check the ISV, but these aren't as
big of an issue on the 4 cylinder models. Your car also controls the idle
with timing. There is a module on the firewall near the coil which
controls timing and idle. I'm not sure how to test this, but I'm sure you
can get one cheap. Try the temp sensor first, if it doesn't pan out, you
can test the current at the control pressure regulator. If you need, I
can tell you about that one later.
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