Question about 2001 Buick LeSabre

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Engine sputtering at acceleration, taking awhile to get to speed

3.8 litre 2003 Chevy sputters during acceleration. It takes awhile to get up to the speed I want and I have to slowly get to the speed I need. I can barely get up to speed fast enough on the highway. If I am at 65 and need to go around a car it just seems like it wants to die or choke out. Mass air flow sensor?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 321 Answers

SOURCE: buick lesabre nightmare 2

  • The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.

Posted on Aug 01, 2008

  • 1 Answer

SOURCE: dodge ram sputtering in low rpms

more than likely its bad sparkplug cables, same problem on f-150 they are probably shorting out somewhere in them

Posted on Dec 27, 2008

  • 416 Answers

SOURCE: My 97 Chevy 1500 runs but it will sputter and shut off .

Check the distributor cap/wires/spark plugs. Also might be clogged injectrors (injector cleaner)
Hope that helps
Good Luck

Posted on Mar 18, 2009

  • 1 Answer

SOURCE: When i start the car

could be the O2 sensors

Posted on May 06, 2009

  • 2 Answers

SOURCE: navigator sputtering will the MAF mass air flow censor cause this

check fuel rail pressure

Posted on May 18, 2009

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