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1991 cavalier 3.1 runs rough and stalls out after warm up or at a stop light

I have replaced tps sensor/crank sensor/ox/ sensor/ignition module/cleaned egr valve. fuel pressure 40 lbs----- running and after shut down .new plugs and wires and new fuel filter. have not replaced ---- map sensor/ idle control valve/or coolant sensor does NOT appear to have a vacumn leak, sprayed all around intake looking for a rise in rpm.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 321 Answers

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

  • 255 Answers

SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

Posted on Aug 18, 2008

  • 1 Answer

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

its just white cuz i too the cat off..

cuz i thought my proble could have been to do with the cat...

cuz i lost power driving up hills and on highways now it just will start the die right away

or start and idle really bad...

any ideas???

i was thinking crank sensor.. or injectors

Posted on Oct 01, 2008

jmgldsmth
  • 1869 Answers

SOURCE: 96 Dodge Intrepid ES, engine stalls

Find your firewall electrical junction block (where all the wires enter the cabin on the passenger side) and with a zip tie pull up the wire bundle so it does not ride on the upper tie rods and, fasten the zip tie to anything that is solid in the engine compartment and, let me know what happens

Posted on Jun 01, 2009

jbass706
  • 167 Answers

SOURCE: MY Ford F-150 cranks but will not start. Check

Are you sure the spark is sufficient? I have seen weak coils cause your problem also bad coil wires loosing to much voltage to the distributor.

Posted on Oct 24, 2009

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