1996 Mercruy Grand Marquis will not idle

GREEKREPUBLIC

MEMBER
1996 MERCURY MARQUIS

I have a 1996 Mercury Grand Marquis. 4.6 v8 and about 109,000 miles. As of yesterday I could only start my car when slightly pressing down on the gas petal. And in order to keep it running while stopped or parked I have to slightly press down on the accelerator petal. A few days prior to my newly acquired problem I added some generic gas treatment (the stuff that supposedly removes carbon buildup from fuel injector heads/carburetor) though the tank. This leads me to believe my efforts to improve my vehicle’s performance did just the opposite. Any ideas?

Tuesday, May 1st, 2007 AT 5:37 AM

2 Replies

MERLIN2021

MECHANIC
17,250 POSTS

2 things come to mind 1 did you make sure the cleaner you used was safe for 02 sensors? And Ford throttle bodies? The other is the idle air controller may be gone!

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Friday, May 4th, 2007 AT 4:45 PM

GREEKREPUBLIC

MEMBER
2 POSTS

Thank you for the feedback I greatly appreciate it. But, something interesting happened. The problem simply just went away. I'm definitely no expert mechantic, or even novice for that matter; but from what it seems, i'm guessing I may have just had some bad fuel in the line. Or something of that nature. The car runs just fine now. Once again thank you for your time.

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Friday, May 4th, 2007 AT 11:32 PM