Question about 1990 Buick Regal

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1990 buick regal runs rough after choke turns off

1990 buick regal 3.2, runs great when first started once choke (high idle) kicks off it starts running rough. the ECM has been replaced new coil pack plugs wires fuel filter(all by previous owner, he gave up on the project and i bought it cheap) i replaced the fuel system temp sender and dumped some seafoam and fresh gas into the tank, it immediately ran alot better so i started driving it around the block and it ran great, just a little rough in gear at a stop(i figured old fuel was the cause) after about 9 miles it started running really rough again even while drivng at 40 mph, died a couple times and restarted itself while doing 30-40 mph, finally at about 10 miles of travel it died completely, restarted went about 50 feet and died again, did this a few times then i towed it home. started it up this morning and it ran perfect at high idle, as soon as high idle kicked off it began to run rough, i was pondering cleaning out the egr, and testing the MAF sensor and ignition modual, however im trying not to just throw parts at it to find a cure.

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  • Josh Canaday
    Josh Canaday Feb 11, 2012

    sorry its a 3.1 not a 3.2

  • Josh Canaday
    Josh Canaday Mar 08, 2012

    just an update, i have since replaced (im going to include everything here) ECM all three coil packs, ignition module. crank sensor, cam sensor, MAP sensor, idle air control valve, throttle positioning sensor, fuel system temp sender. i havnt tried driving it again but i did start it today after doing the MAP and idle air control and while it ran a little rough i didnt die, its never ran for more than about 20 minutes with out dieing, today i let it run for 4 hours and it never died, however once i put a load on it (put it in gear) the idle gets real choppy and it barley stays running. any ideas?



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your on the right route but also check egr valve

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have you replaced your ignition module?

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SOURCE: Starts fine, Idles fine, Drives Fine for a while

you might want to chk. the crank sensor and or cam sensor. sounds more to me that it could be fuel problem. chk. fuel pressure. pump could be on its way out. don't be fooled by hearing the pump running as they sound like they are pumping but there not, at least not enought pressure to keep it running. pressure should be around 50 p.s.i.

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Best to do a fuel pressure test, pump might be weak and dosent show up until it gets gets warm. Best to do the test after it quits again when pump is at its hottest. If you havent done it yet chg. fuel filter too.

Posted on Mar 26, 2009

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SOURCE: 1999 Buick Regal GSX won't stay running......

It's probably the mass airflow sensor and/or oxygen sensors.

Posted on Jun 18, 2009

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1999 Buick Regal GSX won't stay running......

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