Question about 1995 Mercury Grand Marquis

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Hi, my name is Demarse and i am having a starting issue with my car, it is a mercury grand marquis 1995. I was told it was the computer board that was going out. What I did was change out the fuel pump and fuel filter thinking it was that. But I am getting fuel up to the engine. I ask my buddy over the phone and he had me do a couple of things like listen to see if the fuel pump is working and press the stem like deal under the hood on motor and gas spewed out like no tomorrow. He said he thinks it is the computer board because it isn't letting gas run through injectors. I just want your opinion. By the way I looked at problems on line and it seems as everyone else had same problem and they all came to same conclusion.

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I do know that 99% of computers returned to get repaired have nothing wrong with them. That being said I'm not saying that yours is not bad but there's a pretty good chance it's not. Do you have spark? The ignition system must work before the injectors get their signal to operate. Put a small amount of fuel down the intake and see if it starts. Take precautions when you do this. Let me know.

Posted on Dec 27, 2013


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Posted on Jan 02, 2017

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SOURCE: 1989 mercury Grand Marquis fuel system

The fuel pump relay is under the hood in the MAXI fuse box, it is a black box with a huge wiring bundle comming out of it.

Posted on Sep 04, 2008

  • 1 Answer

SOURCE: 1998 Mercury Grand Marquis Fuel Pump Replacement

you can try just resetting the fuel pump switch located in the car

the switch is originally in the car for in case of an accident, however, if changed, chances are you also have to reset it

in my 98 grand marquis, the switch is on the left side of the trunk

Posted on Mar 19, 2009

  • 1201 Answers

SOURCE: after putting gas in the car started running rough and is chockin

It wouldn't hurt to change the filter, but it sounds like you got a bad batch of gas, if it was running good before you got gas.
Get a bottle of dry gas and put it in the tank, if there is any water in the gas, that will clear it out, also it wouldn't hurt to put a bottle of fuel injector cleaner in the tank, I use that stuff all the time to keep the fuel system clean.

Posted on Jul 17, 2009

  • 1 Answer

SOURCE: 1998 Mercury Grand Marquis GS runs Rough when cold

I have the same problem and can
Not figure it out did u have any luck?

Posted on Oct 17, 2011

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