I was going down the road one day and lost my oil pressure. I quickly turned the car off but had to crank it to get it on the trailer and noticed that it started knocking. I think it needs a new oil pump but not sure, also do you only have to remove the oil pan in order to change the pump. Please help. I am so confused.
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Check timing belt. Remove the oil filler cap and look at the rocker arm. If you get someone to turn the engine while you watch and you see no movement... it's a broken belt. If you see movement, perhaps the belt has slipped. Replace belt and re time.
the pcm may have a cracked board, i had an 88 cavalier z24 with the same problem, replced the ecu and it ran fine, the problem is that the boards inside the pcm crack and lose connection, the next time it acts up open the glove box and try tapping on the pcm, if the car responds at all, the pcm is bad
Have someone else see if their scanner will communicate, if not, this is a sure sign that the ECM has gone bad and will cause intermittent stalling. Normally I would recommend changing the crank sensor for this problem and it still may be the cause if you want to try it first, but it sure sounds like a bad ECM.