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Originally Posted by tomogchi
Ihave a '91 buick regal, And recentely is started to be not starting.. I started looking for dead wires, (no spark) and found none loose. So I went and took off the Coil packs, to see if there was a burn mark or to see if i can see a short. Put em back on, she started. Ran good for about 3 days. sooner or later, i started her back up and she was a hurtin unit.... id just tap the gas, shed wanna stall.(like she was onyl runnign on 3/4 clynders or something). So i got A new set of spark plugs and wires. Seemed to fix the problem at the time. Now i went to start her up agian this morning, No start.,... agian.... Geta code 23/42, adn i always get the 42 for a no start (its suttin liek the ecm doesnt talk to the pcm or suttin...)
I took off the coil packs, agian, and looked at the plate they sit on. Looked fine, looked underneath it, its fine..Looked at the plug (that goes into the plate, fine...
My father says the coild packs r good... But i have no clue on what else to check... The car sat for abotu 4 months before i got it, and when idid get it, it had no headlights...(still doesnt...) Could these 2 maybe be related or something? I dunno, btu the No start has got me...
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There is an ESC module that has four wires going to it. check that. Also try checking your MAF, I realize that it is not throwing a MAF code but they almost never do, but they will throw a 42 because the rich condition will foul plugs.
here are some other things to check. But I would try the MAF before anything elese because a code 42 would not keep the engine from starting. A bad MAF would make it run REAL BAD.
1) BYPASS line is open or grounded
2) EST line is open or grounded
3) PROM or CALPACK not seated properly in the ECM
4) Poor connections between ignition module and ECM
5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise)
6) Faulty or incorrect ignition module
7) Faulty ECM