Question about 2003 Buick LeSabre

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Replaced map, maf, tp, crank, & cam pos sensors. new plugs & wires. Car dies while coasting, idles fast 2000 rpm at times, and surges or misses while driving. had car to 3 ind shops and 2 buick dealers. One dealer said catalytic converter bad causing all problems. Replaced and problem persists. Goin nuts over this.

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  • skipworthage Sep 29, 2009

    most recently : MAF or VAF

  • skipworthage Oct 02, 2009

    P0108 MAP/Baro circuit high input
    (this code is showing twice)
    P0101 MAF or VaFA ckt range/perf
    P0121 TPS/Pedal Position Sensor A ckt range perf

    The dealer has now concluded that my transmission is causing all of the problems, although I have had a reputable trans tech w/30 yrs GM exp check it out and found no problem. The dealer said that it was probally the torqe converter. The trans tech did not break it down.

  • skipworthage Oct 02, 2009

    Very little salt locally. And the dealer said he won't "buy the job" if it doesn't work. He wouldn't refund or adjust bill for the catylytic converter that they said was the problem, but wasn't.

  • yadayada
    yadayada May 11, 2010

    then they are a shittt dealer.

  • yadayada
    yadayada May 11, 2010

    since the dealer will basically buy the job if the trans is not the problem go ahead and let them proceed, do u live in a state where they use salt on the roads?

  • yadayada
    yadayada May 11, 2010

    what are the specific trouble codes?, these sensors have about 12 diff codes that can occur for diff reasons of sensor performance.

  • yadayada
    yadayada May 11, 2010

    what trouble codes do u have?



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Posted on Jan 02, 2017

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SOURCE: engine stalls

your on the right route but also check egr valve

Posted on Jul 07, 2008

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SOURCE: 1992 Buick Regal Custom keeps dying in gear unless I double pedal

unfortunatly it sounds like you are having issues with the torque converter. it sounds like it is locking up all the time now. this requires the transmission to be taken out to change it i do not know what your experience is so not sure if you have the tools or knowledge to do it yourself.

Posted on Apr 30, 2009

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SOURCE: 1992 3.8l buick lesabre keeps dying when the temp. outside is hot

I do think you catalytic convertor is bad

Posted on May 24, 2009

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SOURCE: Buick LeSabre makes funny sound!!!

It is a sign of a clogged convertor, but i happen to own the same car (with a series 2 3800) and had the same symtpoms going on when i bought if for the wife. Mine turned out to be a Exhaust Gas Recirculation Valve (EGR Valve).

To kind of get a feel for what is going on with the convertor, you can have someone help you but sitting in the drivers seat, with the car running. You go behind the car near the tail pipe. Now have the other person rev it up a little, not to much though. Put your hand but the tail pipe to see what kind of pressure the exhaust has. You can use another vehical to do the same thing to feel what things are supposed to feel like. If the convertor is plugged, the pressure of exhaust coming out will be a lot softer than it should be.

If after checking it as discribed above, if you feel it is plugged, grab a hammer, and bang the heck out of it. This will break up and loosen the clogged part without have to replace it.

There is no really good way to test a EGR vavle without a special computer. Replacing it however, does seem to me as the most likely repair for this vehical. It is located on the top of the drivers side of the motor. It look like a cylinder with a wire coming out of the cap, and is held on by 2 13mm nuts.

Good Luck....

Posted on Mar 24, 2010

  • 105 Answers

SOURCE: 2000 Buick LeSabre Will not start Replaced cam

Multiple engine misfire is related to the coils and the ignition control module. I have a 2002 with the 3.8 engine. It has three coils. I just went through this problem. I bought one coil and tried it in each position with no improvement. It was the ignition control module. Mine is located under the three coils. A relatively easy item to replace. Cost about $140.

Posted on Apr 19, 2010

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' Image
Theory of Operation
This DTC sets when an unexpected high intake manifold air flow condition exists that
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(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
1: hot or cold or both.?
2: low extreme RPM and high at idle.

400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
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keep in mind if not in closes loop and lean
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4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

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2: clean MAF if car has one, ask how..
3: check fuel pressure.

my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
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MAF is air density EFI
MAP is speed density EFI.
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