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Grand Marquis starting nightmare

7 messages,  Last post on Apr 08, 2008 at 10:10 AM

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

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#2 of 7 Re: Grand Marquis starting nightmare [marquisman] by danielj6 Mar 11, 2007 (3:12 pm)
Replying to: marquisman (Mar 10, 2007 7:15 am) Has any of the shops hooked up the engine to a computer to see if they can retrieve trouble codes before they recommended replacing parts?? Did they keep the car overnight to try to start it during very cold weather in the morning??   If they didn't, they should because they seem to be guessing. Otherwise, you will have to take it to a Mercury dealer service. Some shops are connected to on online database which, once the codes are obtained, it tells them where the problem is. I believe Auto Zone diagnoses engine problems that way. Replies to this message: marquisman (Mar 12, 2007 10:09 am)
#3 of 7 Re: Grand Marquis starting nightmare [danielj6] by marquisman Mar 12, 2007 (10:09 am)
Replying to: danielj6 (Mar 11, 2007 3:12 pm) The second place I took it to was a ford motors dealer and they had it 2 days and all they could come up with was bad fuel pump and mass flow valve and a funny thing is the 1st day they said the pump was fine and then the next day it wasn't. I had the mass flow valve replaced and no difference. The only codes that they could get was a misfire code and that is they replaced the plugs and wires. I am going to replace the fuel pump relay tomorrow as I can get one at NAPA for $11 and who know it may take care of the problem.
#4 of 7 '89 Grand Marquis 5.0 Starting "NIGHTMARE" by walar2007 Aug 09, 2007 (10:56 am)
Is there anybody out there able to share with me how to overcome a cranking, however "NON-STARTING" 5.0, with only 77,620 miles? I've replaced the following: Plugs, Wires, Distributor, Relay to Distributor, Ignition Coil, Battery {twice}. This started two weeks ago. Some days it starts no problem; yesterday, today is a different story . . . .NOTHING. I ran the battery down then began all over again . . . NOTHIN'. I'm at my wits end and need someone to come along side and "PLEASE HELP". Your assistance is well appreciated. Thank You, walar2007. Replies to this message: browney (Aug 14, 2007 6:22 am) beedub (Jan 02, 2008 4:43 pm)
#5 of 7 Re: '89 Grand Marquis 5.0 Starting "NIGHTMARE" [walar2007] by browney Aug 14, 2007 (6:22 am)
Replying to: walar2007 (Aug 09, 2007 10:56 am) I think these older GMs have a ballast resistor in the ignition system. If it does you should try replacing it. Replies to this message: beedub (Jan 02, 2008 4:43 pm)
#6 of 7 Re: '89 Grand Marquis 5.0 Starting "NIGHTMARE" [browney] by beedub Jan 02, 2008 (4:43 pm)
Replying to: browney (Aug 14, 2007 6:22 am) i agree with above and maybe it could be the fuel delivery to the car, fuel shutoff buttin could be stuck,hole in the fuel line,fuel line rusted
#7 of 7 Re: Grand Marquis starting nightmare [marquisman] by jandracchi Apr 08, 2008 (10:10 am)
Replying to: marquisman (Mar 10, 2007 7:15 am) Same year same problem - solved the problem by using lower octane fuel - fixed it immediately - I could go into octane as a measure of combustibility and why the higher octane struggles in the lower temperature but I am not qualified. Try it - I believe it will work.

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