blackdeathmessenger
OBS Enthusiast
I have checked for vacuum leaks multiple times and have found none
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Nope, the ECM/PCM will store the code(s) for ~30 - 40 key cycles. Maybe set your timing, as suggested, and disconnect the battery to reset the EST code you'll set by doing that. Then start over to see what other codes pop up.I know obd1 doesn't usually store codes unless there's serious issue(s).
Well, I did put a '91 c/k computer in it, since I've read elsewhere that it can smooth out engine idle and such. To my knowledge, and from my experience, the '91 c/k trucks should have pretty much the same sensors, with a few minor differencesDo you have an '88 computer in there? Only reason the truck would be looking for an IAT is if it thought it was supposed to have one, which it doesn't.
Well, good to know. I also didn't disconnect the battery after I fixed the timing last time. I thought it would fix itself after I cycled the key with the connector reconnectedNope, the ECM/PCM will store the code(s) for ~30 - 40 key cycles. Maybe set your timing, as suggested, and disconnect the battery to reset the EST code you'll set by doing that. Then start over to see what other codes pop up.
It's even better to put a scanner on it and data log.
What service number ECM and BCC (.bin) are you running now?Well, I did put a '91 c/k computer in it, since I've read elsewhere that it can smooth out engine idle and such.
Is it possible they had multiple part numbers and I might have gotten the one that was incompatible?What service number ECM and BCC (.bin) are you running now?
Yep, you can't just swap chips from 1 ECM to another. Each .bin is coded for their own Service Number ECM. A different model ECM will be looking at a different address in the chip.Is it possible they had multiple part numbers and I might have gotten the one that was incompatible?