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Re: If I replace the engine computer in my 1992 GMC...
It should be a plug and run solution. The new computer may take a while to relearn all the input from the various sensors but after running a while all will be well.
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u can try to pour some oil in the spark plug holes and let it set for a couple days to see if rings r stuck if its bottom end that is causing the lock up then its a done deal rebuild or replace motor
Try taking the wire of the temp sender unit and touching the engine and see if the gauge goes up to hot. If so then replace the temperature sender unit ( different to the sensor unit)
Actually the problem is the connector on the back of the instrument cluster. Early 90's GM were prone to bad connections. You will need to remove the cluster. On the back side is a large, rectangular connector with many brass connectors. There is yoour problem. CAREFULLY examine them. If they are corroded, CAREFULLY clean them with a pencil eraser. Remove all eraser bits whne you are done. Try not to bend them (unless they are already bent) and make sure all are even. When you replace the cluster, make sure it fits tight/snaps into the dash. Good Luck.
There is also a chance that the cluster circuit board has a bad connector or bad solder points. This is very difficult to repair yourself but I see on EBAY that there are places that do this type of work for about $100... Try cleaning it first.
Check fuse first, if good then check for vacuum leaks, the controls run off of engine vacuum. I will need your feedback after you check those items to be able to assist you futher.
There could be more than one problem in your problem your charging system so the first thing to do is get the engine computer program updated and og from there. The computer is also the controller to the alternator.
Have a fuel pressure test done, also check fuel filter make sure not clog. If check engine light on run computer diag, if it has an MASS sensor could be bad, also get reading of TPS should have .50 volts at idle.
First thing unhook positive battery cable, unhook main cable on starter selanoid and small wire on selanoid (there may be 2 small wires) There may be a bracket on front of starter that has to be removed, and then the 2 main bolts that hold it to engine block and it should come out.
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