Question about 1996 Mercury Grand Marquis

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96 grand marquis won't start unless gas pedal is press on but dies when I lift foot off gas pedal.

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The switch at the throttle is called a TPS, throttle position sensor. It is fairly easy to change, has 2 screws and 1 electric connector. When you put your foot on the gas pedal a cable running to the Airhorn will move a part which the TPS is connected to.

The TPS is a variable resistor and it is possible to be bad on one end and good further up. Now if replacing the TPS does not solve your problem, something else is slightly off that can be compensated with the footpedal. You may have low fuelpump pressure or a low Vacuum pressure level contributing to the starting problem.

Both Autozone and Oreillys can scan your car and they do it free. You may find another component is bad. The scans will help, but do not cover every system. The TPS is not an expensive part and it is where I would start.

I hope this is helpful to you. Thanks for using Fixya.

Posted on Dec 30, 2010

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