Ok im new to this so here we go i have a 92 firebird with the 3.1 L v6. my problem is when i crank the car and let it warm up i get a check engine light once warmed up, and when i go to drive it hesitates when i take off and doesnt get any better while trying to drive it. ive replace plugs, wires,destributor,IAC valve , fuel pump,coil twice , and much more i have yet to find the problem. its like the more i try the worse it gets . i need help please ..... thanks michael
You must do a fault code test, anytime the check engine light comes on a fault code is set in the computer control units memory. To do this test without any special tools follow the instructions at the link below.
FAQ How to read older GM codes for free
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.
SOURCE: 96 firebird is having problems,
Have you ran a diagnotic check to see what codes are coming up?
Throwing parts at the problem will get expensive. It will also ruin other parts (Like your catalytic converter), when your engine is misfiring and not running properly. Your vehicle is an OBDII system, fix the problems in the order they appear (then clear, run and recheck)...meaning, one problem can cause another and so on. Fixing one problem may correct the other ones too.
You may get lucky with the shotgun approach, but usually not.
Run a diagnostic test, at least you'll know where to start looking for the problem.
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im sprayed throttle body cleaner in it and it seemed to fix it for a min but nothing. im about tired of fooling with it .
where is the air flow switch
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