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Reading the ecu on a LH 2.2 / Weird Idle 200 1987

posted by  Wilbo on  Wed Dec 21 10:51 CST 2005
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Hello,

I've got an '87 auto trans wagon that I recently aquired. Seems to be a pretty good car, 107k miles and everything quiet and smooth. I usually buy sticks but I spend a lot of time in traffic these days so what the hell, thought I'd try an auto. About a week ago, I started to notice the Idle raising and lowering erracticly. I don't have a tach so I don't know the numbers exactly but I'd say it never lowers beyond normal idle and doesn't go above maybe 1500 to 2k and it usually doesn't stay at a high idle, but shifts around. Also, it only does this once warmed up. It starts fine and runs properly until every thing is at operating temp. than it gets weird.

So I searched this forum and others and found many references to poor idles of various kinds. from what I learned, it sounds like it could be the MAF, the Throttle position gizmo, the IAC, a dirty throttle body, or the ECU. I never found a post about my particular version of the idle problem so I'm not sure which to check first.

So I thought I would check the ECU to see if it's getting an error code that would help narrow down the search. So after much investigation I've gleaned that pre '89 models have the LH 2.2 which does not have the diagnostic box with the nifty little LED light and button, but I can't find any information one way or another that says if there is a way to read stored codes or even if the LH 2.2 stores codes at all.

Ok well that's it. Thanks in advance for any help.

W-






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