Question about 1999 Mercury Grand Marquis

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1999 mercury grand marquis. It starts but dies after you let off the gas pedal. Could it be throttle position sensor?

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Not a TPS - have codes read w/OBII scanner any good parts store can do it for you, most will free. Could be alot of things but TPS isn't one of them from your description.

Posted on Apr 04, 2011

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That is where i would start, It's the most common issue for this problem. Good luck to you.

Posted on Apr 04, 2011

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1993. What would cause the car to not accelerate but still remain running?


How to Test the 4.6L, 5.4L Ford Throttle Position Sensor

easyautodiagnostics.com > Ford > 4.6L, 5.4L
Dec 21, 2010 - Testing and troubleshooting the throttle position sensor (TPS) on your Ford ... No power as you accelerate the vehicle. ... Grand Marquis 4.6L,. 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004.

Aug 12, 2015 | Mercury Grand Marquis Cars & Trucks

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Starts and will stay running as long as the gas pedal is being pushed but as soon as you let off the gas pedal it dies


Please see my tip at http://www.fixya.com/cars/r7427423-fix_poor_idle_high_idle_stalling_fuel . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Apr 03, 2011 | 1999 Mercury Grand Marquis

1 Answer

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


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.

Dec 29, 2010 | 1996 Mercury Grand Marquis

1 Answer

Intermittently (usually cold weather) on starting car races up to about 2200 rpm, back down to 7-800 repeatedly and generally after doing this 8 or 9 times dies. after the engine has warmed up runs pretty...


Could be the throttle position sensor, sometimes just unplugging it and plugging back in will solve the problem when it is temp related, (engine off of course).

Dec 19, 2009 | 1999 Mercury Grand Marquis

1 Answer

I have a 1995 Grand Marquis and my check engine light came on a few days ago. The car died today while holding the brake in waiting at a red light. I quickly turned off the car and turned it back on and it...


Most likely culprit is the ETC (electronic throttle control). Different companies call it TPS (throttle position sensor) i.e. but what's happening is when the car is cold, the initial throttle setting is high until it warms up and kicks down to a secondary throttle position. Since these things are monitored electronically, there's nothing you can manually set. The part itself ( i think its TPS in your car) is usually a black component with an outer white layer located under the air filter. Hope this answers your question. Best of luck.
Greg

Jun 05, 2009 | 1995 Mercury Grand Marquis

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