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'82 B21F T -- idle and acceleration problem 200

posted by  someone claiming to be loose_nut on  Sun Nov 12 11:30 CST 2006 [RELATED]


Heya All,

So I have an '82 Turbo 240 and I've figured out that it has K-Jet mechanical injection. The car is my first turbo, so I'm trying to soak up all I can on how turbos and injection work.

My current minor problem is that when I start the car up from cold ( it is hovering in the 0 to 20's range in my region now this winter ), it will idel smoothly for a while, but it seems like one it reaches a certain heat level, it starts to get uneaven, then it does this little roowww-rowww-rowwww thing... just kind of an uneaven cycling pattern. It's not loud or anything, but not smooth.

So... then the other symptom is that when I drive, it will sometimes do a kind of slightly lurchy acceleration thing, but kind of smooth out into third gear. It seems to me that the two things are probably interlinked and related. I am suspecting the "CIS" or "Constant Idle Speed" system as described here on this site (http://oregonstate.edu/~erdts/kjet/articles_kjet.html). I most suspect the idle air motor, but I can't seem to find it on my engine. It says in the article that it should be located "on the underside of the intake manifold. On an LH-Jet car, it is bolted to the intake manifold support bracket, underneath the intake manifold." I've looked under the manifold, but don't seem to see such a device. Is it really buried under there? Oh, and I am really assuming that I have CIS, as I can engage the clutch and accelerate out of first without even touching the "gas" pedal.

I've heard that the wiring harness on these commonly goes bad at this stage, but it really seems like this is cyclic-regulation issue rather than some wire shorting out. Usually wire problems are either an "on" or "off" issue, not some voltage variance curve.

What do ya all think?





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