You need to scan the computer for trouble codes. If the light was on, there must be codes set. On a '95 Buick, it would be OBD-1, On Board Diagnostics-first generation ('96 and later is all OBD-2).
The diagnostic connectors are different for OBD1 and OBD2, but in '94 and '95, GM was on some models using a "hybrid" diagnostic link connector. You will just have to find the right diagnostic connector to get your codes. The guys at autozone or a national parts store who do engine scans for free may help you figure it out. If it is a straight forward OBD 1 connector, a cheap code reader could scan for trouble codes. For the OBD1, you can also use a jumper wire between terminals
A & B of the diagnostic link connector. Turn key to on, and two digit codes will begin to flash on the check engine light. Code 12, for instance, would be a flash, pause, two short flashes, and longer pause before the next code appears. Code 12 by the way, just means that the computer is in diagnostic mode-after that any set codes will appear or be flashed. Code 55 may also be flashed-this code means the end of codes that are set.
I tried to have codes read. It was not reading the computer. So i am working down the line checking mas air flow sensor, crankshaft position sensor, and computer.
Check the diagnostic connector. Does it have a 12 slotted connector, 6 on top and 6 on bottom? (Not all slots will have a wire terminal to it.) If it is, that is a normal OBD1 connector. Take a jumper wire and jump terminals A & B, the two upper right terminals or slots. Then codes will flash on the check engine light. Worst case, backfiring could be a valve timing problem-a compression test might give some indication-but if runs good with light on, don't know if it could be jumped timing. Clean the MAF sensor with maf cleaner, be careful, it is delicate. Make sure it is dry before re-installing.
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SOURCE: 1992 buick lesabre firing problems
Remave the battery cables from the battery and clean the connections and replace bolts. Have seen this before.
SOURCE: one of the 3 ignition coils not firing. engine run
Most likely the ignition module the coils sit on is not firing that coil.....a 90% chance.
Instead of changing the coil......just change position of the coil on the module to check this.
After you get it running good......change the crank pickup....they should be changed on every tune up on the 3.8......
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