Question about Buick Regal

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I have a 1991 buick regal with a 3.8L engine. when the engine is still cold it preforms great. but the more i drive the more sluggish it gets

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  • despisedicon Oct 20, 2008

    oh also the check engine light is on for the camshaft sensor. i replaced the sensor but it still trips. so i assume its the magnet or the wiring to the sensor. i would do the magnet its just a real pain in the *** to get to



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I would start with the simple stuff, do you have a CEL light? I would check all tune up items, also how many miles are on this car??

Posted on Oct 19, 2008


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1 Answer

My 1991 Buick Regal (3.1 engine) use to start a high RPMs and then slowly, as the engine warms up, the RPMs would come down to about 800, which is the normal. However a few weeks ago, it started to start...

You need to get your engine coolant thermistor checked and tested. This is what tells the ECM when the engine temperature is at normal working temperature and turns the idle down.
But when the idle won't come down from cold to warm this is usually the main fault.
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Jan 28, 2011 | 1991 Buick Regal

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1991 Buick Regal will not start on cold mornings. Battery has been replaced. What else could it be?

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Jan 16, 2011 | 1991 Buick Regal

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I have a 1991 buick regal stalls and shut off after warming up

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Feb 07, 2010 | 1991 Buick Regal

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Hey ive got a 1991 buick regal 3.8L just a couple questions. #1 when the car has been running for awhile Idle or driving and then been shut off when it is re started in the near future before the genine...

Get the fuel pressure checked after you change the fuel filter. The magnet on the came gear will most likley need to be replaced. The timing cover will need to come off to do this. While you are in there replace the chain, cam thrust spring and tensioner too. The cars with 3800's will usually shut off when the crank sensor gets hot after driving. Cooling it with a spray bottle of water will sometimes make them run. As for you case when it acts up spay it and see if it clears up. If so replace it. What are the engine codes? reply

Dec 13, 2009 | 1991 Buick Regal

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Jan 20, 2009 | 1991 Buick LeSabre

1 Answer

Engine seems to be loading up with fuel and won't preform

It depends on the year model and make of vehicle and the type of fuel delivery system (carburator or injector ignition.). It could also be the EGR valve.

Jan 19, 2009 | 1995 Buick Regal

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Heater no working on 1991 buick regal 3.1

It probably has an airlock - so needs the air leting out of it.

If you have the bleed screw on the pipe that goes from engine to bulkhead, then, with engine cold, and heater turned to heat, start engine( KEEP CLEAR OF FAN / BELTS ), and undo bleedscrew to let out air. STOP ENGINE. Refill coolant to mark with antifreeze mix.

If this soes not solve problem, it could be more serious - either blocked matrix or if you only find steam regularly - it's a head gasket problem - requiring replacement.

Jan 13, 2009 | 1995 Buick Regal

1 Answer

Hey. you responded to my question about the 91 regal acting sluggish the warmer it gets and the longer i drive it in one trip. ive pretty much knocked out the simple stuff. since i have owned it i have...

An air ambient temp sensor wouldn't have that kind of effect on the engine. I would lean more towards the CTS. Also I would check the vaccum line running into the MAP sensor as well. The mileage doesn't indicate a converter issue.

Oct 20, 2008 | 1991 Buick Regal

1 Answer

1991 buick regal , 3.8lt,

1991 3.8 liter engines used a Mass Air Flow sensor in the intake tract (measures incoming air) instead of a MAP sensor. The MAF sensor is located on the engine just behind where intake hose is attached.

Jul 04, 2008 | 1991 Buick Regal

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