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1999 Mercury Grand Marquis Help....

7 messages,  Last post on Jan 26, 2009 at 3:52 PM

You are in the Ford Crown Victoria/Mercury Grand Marquis Forum.

What is this discussion about? Ford Crown Victoria, Mercury Grand Marquis, Engine, Sedan

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#1 of 7 1999 Mercury Grand Marquis Help.... by Mercman76

Nov 29, 2008 (2:53 pm)

I need help? I have a 99 Grand Marquis and its acting really weird first I thought it was misfiring so I went to Autozone and had it scanned and nothing...I was mad and figured that the person didn't know what they were talking about so I went to another Autozone and the same.....I'm confused because I was told that if it was a coil or spark plug it would throw a misfire code. If it was a fuel injector it would throw a code saying a bad injector and what cylinder its present in, then I was told that it might be my harmonic balancer. The car has duel exhaust and the driver side pipe is sputtering which makes me believe that its not that, but a misfire. So if anyone can help me I would greatly appreciate it.
 
Thanks

#2 of 7 Re: 1999 Mercury Grand Marquis Help.... [Mercman76] by martykyj

Nov 30, 2008 (10:06 am)

Replying to: Mercman76 (Nov 29, 2008 2:53 pm)
It could be that the fuel injectors need to be cleaned or some water in the gas but you really need to have a garage look at it to at lease pin point the problem. You will end up running around it circles if you go by "he said she said" try this or try that. Some fuel injector cleaner in the gas is a cheap way to start. Don't put dry gas in the gas tank, the gas already had 10% alcohol in it.

#4 of 7 Re: 1999 Mercury Grand Marquis Help.... [Mercman76] by euphonium

Dec 01, 2008 (11:46 am)

Replying to: Mercman76 (Nov 29, 2008 2:53 pm)
How many miles on your fuel filter?

#5 of 7 Re: 1999 Mercury Grand Marquis Help.... [euphonium] by Mercman76

Dec 01, 2008 (12:59 pm)

Replying to: euphonium (Dec 01, 2008 11:46 am)
I wanna say like 5000+ miles maybe... I purchased the car this past May. I changed the plugs, fuel filter and gave it a oil change. I was thinking it was the plugs but in the past when a plug was fouled it would throw a code that theres a misfire. I haven't started it in a couple days due to someone saying it could be the harmonic balancer and it could take out the crank seal. I was going to change the plugs again but I'm not sure.

#6 of 7 1999 Mercury Grand Marquis No Power to 4 Coils by tbird94merc99

Jan 11, 2009 (9:55 am)

my car has coil overs. im not getting 12v to 4 coils. tested the wire harness. wires are fine. changed the cam shaft sensor. car is still not firing all cylinders. can this be the pcm or the crank shaft sensor.......any ideas?? please help...no money to take it to a shop

#7 of 7 help in locating parts by Freewayfil

Jan 26, 2009 (3:52 pm)

 1999 grand marquis digital instrument cluster when i use the heater the speedo and odometer quit but if i dont use the heater no problem mechanic at ford dealer says possibly the instrument cluster my be defective where can i find a good used cluster ty

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