Question about 2002 Buick LeSabre

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2002 Buick lesabre check engine light flashing and runs rough help

Posted by Anonymous on

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  • Buick Master
  • 11,492 Answers

You have a misfire ,spark plug ,coil etc. .. the flashing check engine light is to warn you that the misfire is severe enough to damage the catalytic converter ! You need to take it to a repair right away ! A new catalytic converter can cost as much as $1,000 . The shop will check the code's in the PCM . this will tell them what cylinder is misfiring !

Posted on Apr 22, 2015

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Posted on Jan 02, 2017

fastboyz
  • 674 Answers

SOURCE: rough idle

fuel filters rarley cause idle problems. i would look at the egr valve or possible vaccume leaks.

Posted on Aug 24, 2008

  • 1 Answer

SOURCE: 1987 Buick Lesabre T stalling and running rough

I just had the same problem. Replaced the fuel filter,still crappy idle and no acceleration. I replaced the fump pump along with the wiring harness and the fuel pump screen and my cars purrs like a kitten,has back to normal acceleration and idles better than before. Hope this is some sort of help to you. I did it myself. Total cost, a little over $120. Good luck. By the way, your fuel pump should be pushing out about 65 lbs of pressure. is it ???

Posted on Apr 21, 2009

  • 13 Answers

SOURCE: 1996 buick LeSabre runs rough at 50 mph

Sounds like low fuel pressure. i.e. fuel pump, fuel pressure regulator, or fuel filter.

Posted on Jun 02, 2009

  • 50 Answers

SOURCE: 1993 buick lesabre won't start. security light is

The coded key probably needs to relearn. Turn ignition to crank and release. Let sit in on position (engine off of coarse) for a full 10 min. turn off for 30 sec. and repeat 3 times engine should start. This procedure should take 30 min. so a booster is needed to maintain a full 12 volts. Do not attempt w/out a charger connected;

Posted on Mar 30, 2010

  • 1584 Answers

SOURCE: Check engine light is flashing and car runs rough.

Its either running too rich or too lean, either way have it seen to quickly or engine damage MAY result.

Posted on May 13, 2010

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1 Answer

Running fine then rough run engine. flashing check engine light


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From the symptoms of the problem and the precautions you have done i think its time to check the EGR valve.Clean your EGR valve and then put it again. How handy you are in ding this?

As the check engine light is on did you scan for error code which will help you more specific to locate the problem.

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My check engine light is flashing, the car runs rough until I get up to about 30mph and it is running through gas like crazy


Sounds like you have cylinder misfire. Any of the large auto parts stores can run an OBDII check and tell you which cylinder is misfiring (not firing). The engine is running with one cylinder out causing the rough idle. The faster the car goes the less perceptible the misfire is. That is why at 30mph the car seems to run smooth.

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2002 buick lesabre check engine light on. need a


It would be better if you got the codes read and then post back with the code.There are numerous codes that can cause the check engine light to go on.Auto Zone will do this for free.There are a few other parts stores that do this for free also.Hope this helps.Good luck.

Mar 15, 2010 | 2002 Buick LeSabre

1 Answer

Rough idle


fuel filters rarley cause idle problems. i would look at the egr valve or possible vaccume leaks.

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