Question about 2005 Buick LaCrosse

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2006 lacrosse idles slightly rough and sometimes jerks slightly under light to medium accelleration. I went to replace the fuel filter, but I can't find the filter.

Posted by Nathaniel Boyea on


5 Related Answers


  • 1 Answer

SOURCE: Check Engine light & slight hesitation

I had the exact same problem. The mechanic found a spark plug that was leaking on the back of the engine that was a pin to get to.

He replaced all plugs and wires and I no longer have this problem, so you may be onto something with the plug wire being loose.

Posted on Jul 22, 2008


paul erickson

  • 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


Roberta Smith

  • 5158 Answers

SOURCE: 84 Z31 Turbo - Rough idle and poor slow accelleration

I would suggest a few things ... first and the most important... check that you have the wires in the proper order on the distributer. next have the timing checked.


Posted on Dec 27, 2008


  • 12 Answers

SOURCE: sputtering and hesitating

Try replacing the PCV valve, and spray the carb, or throttlebody, with a good carb and choke cleaner.

Posted on Apr 10, 2009


  • 80 Answers

SOURCE: 98 mitsubishi mirage misfire or fuel prob

change the fuel pump relay

Posted on May 06, 2009

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Although is could be a fuel filter, it could also be a fouled spark plug, or a bad spark plug wire. Once you've ruled these things out, the problem could be the TPS (throttle position sensor). This controls your idling speed under all conditions. A faulty TPS will usually idle fine when the engine is cold but once warm, will tend to sputter and in some cases, stall.

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A tune up would greatly help. Plus change all filters especially FUEL filter. Another common issue w/Benzs is vac lines cracking, breaking etc... causing similar symptoms you listed. Most are buried in/around and under air filter, inspect all the vac lines closely. But again a good healthy tune up will give you a good "ground zero" point for reliability.

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I assume the check engine light is not on. I suspect you may have a slight vacuum leak, especially if it idles a little rough. Check all under hood vacuum hoses for cracks and make sure they are all connected.I also highly recommend you replace the fuel filter if you have no done so.

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