Question about 2001 Lincoln LS

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2002 lincoln ls idiling strange. Rpms go up and down.

I'm not sure if it's the change in weather or if something is wrong with my car. I live in Florida so it's generally very hot. The past two mornings were about 50degrees and when I woke up and started my car it idled very strange. The rpms were going up and down while in park, it was making the car shake. While driving I took my foot of the gas peddle to coast and the car continued to drive at 25mph. While sitting at a red light it was idling so low I thought it was going to stall. Any suggestions? The check engine light is not on.

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  • Anonymous Jan 25, 2009

    2002 Lincoln LS V8. At idle, car feels out of balanced and sounds like its missing a fire from one of the spark plugs. When I press down the accelerator, it does not go beyond 3000rpms even in park. In drive, the car takes off normally, but when the overdrive kicks in the car studders....almost feel like the transmission is going bad. Popping up the hood, I do hear a sucking sound when the gas is pressed.


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Vaccum leak.  There are a bunch of little hoses in the engine compartment that give vaccum to various components,  if one is leaking (dry rot and cracked) or got pulled off when someone replaced ... say an air filter or other service ... you will get this symptom.    

A variety of sensors and the computer itself can also cause these problems ... if the component is not throwing an OBD II code, it WILL be costly (time AND $) to find the problem.

If you open the engine compartment and can detect a slight sucking sound from somewhere,  that is a vaccum leak and may be your problem.    You could have autozone or another nice parts store pull OBD II codes for free, but if the check engine light is not on, there may not be any codes to pull.

good luck.

Posted on Oct 29, 2008

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