Question about Lincoln Town Car

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Rough idle after initial startup.

1991 towncar. Cold start it idles good, after it picks up sensors and slows down the idle becomes very rough. I have new plugs and wires installed with no improvement. No check engine light on.

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  • gespecht Apr 15, 2009

    Chuck943

    Thanks. I have tried cleaning the MAF as you have described with no luck. When I disconnect the MAF while running, the idle changes a little then continues to idle rough. Can't find any vacuum leaks. Guessing O2 sensor or pcv. Thanks for your advice.

  • Anonymous Apr 15, 2009

    once the car idles it runs rough. Ichanged plugs, wires, and core pack. also unplugged my injectors one at a time but only the 4 on the back (2on both sides)made a difference.

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1995 Lincoln Towncar Idle rough now check engine light on?

Posted on Dec 03, 2009

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  • Lincoln Master
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Really the sky is the limit here. See when you first start vehicle the computer is in open loop which means it is not monitoring the O2 sensors and fuel control is set to a calibrated setting. After the Heaters heat up the O2 sensors it then goes into closed loop and starts monitoring the O2 sensors to control air/fuel. So anything in the fuel and air mix could be causing your problem like false air volume reporting from the MAF sensor,a vacuum leak,unmeasured air getting into the engine behind the MAF sensor from a leaking hose,,a faulty pcv system,lazy O2 sensors, etc.
I would first recommend cleaning the MAF sensor and resetting the keep alive memory.Get a T20 torx bit and remove the MAF and get some electrical cleaner and spray the MAF bulbs clean then let it air dry or blow it dry with light shop air. Then disconnect battery for about 30 minutes to reset the strategies and see if this cures your problem. It will take probably 50 miles of driving for the strategies to reset.

Posted on Apr 15, 2009

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