Question about 1984 Buick Regal
I had done some recent work on the car first it was a coolant leak, then while i was fixing that i noticed a fuel leak around the front of the carburetor where the fuel filter threads into it. so i put in a new fuel filter and threaded it back into the carburetor and replaced a section of the fuel line that goes into the fuel filter because it was tweaked. then after that the car started idle rough but eventually evened out so i took it for a test drive, and on my way back the check engine light went on then off and i never seen it again but since i disconnected the battery on this buick being its an OBD 1 it reset the codes so now i cant figure out why it wont start. I replaced the coil and the map sensor because they were no good.
Check the coil packs for voltage , the cam position sensor and the throttle position sensor. Put a code reader on it and crank it so any new codes will come up.
Posted on Mar 30, 2017
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Posted on Jan 02, 2017
SOURCE: buick lesabre nightmare
Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.
Posted on Jul 31, 2008
SOURCE: buick lesabre nightmare 2
Posted on Aug 01, 2008
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