Question about 1991 Mercury Grand Marquis

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1991 5.0 mercury garand marquis has fire no injector pulse

I have check fuses and relays all ok has so signal from ecm

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 328 Answers

SOURCE: mercury grand marquis

it is on the fender near the battery and is also referred to as the starter solenoid (if you follow the large wire from the positive terminal of the battery at the other end will be your relay/solenoid)
hope this helps!

Posted on Feb 28, 2009

  • 1 Answer

SOURCE: Can someone post a fuse diagram for 1991 mercury grand marquis ?

they don't have diagram that i've seen, my roommate has this car and on page 172 of owners manual it gives the number of what fuse does what,, .. which corresponds to the number on the lid of your fuse panel

Posted on May 20, 2009

emissionwiz
  • 75005 Answers

SOURCE: 1991 mercury cougar V6 3.8 liter

yes u have a defective flasher relay.

Posted on Oct 20, 2009

  • 55 Answers

SOURCE: flasher relay in a 98 mercury grand marquis?

The fuse block the relay is located in is behind the knee bolster, the trim panel under the steering column, left of the steering column underneath the dash. Common source of problems if that does not fix it is the Light Control Module ( LCM), turn signal switch unit, headlight switch.

Posted on Mar 09, 2013

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1 Answer

1990 eighty eight 3.8l. Why no fire/pulse to the injectors?


The camshaft sensor may be bad. Check the fuse for the injectors and it is possible the ECM is bad or the injector drivers more specifically are bad in the ECM .

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Did you check the crank sensor and all the fuses?

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Are you certain that the pump is on when the no start occurs? Do you hear it turn on with key on, not start, when the engine won't fire? It should turn on for 2 seconds to pressurize the line to the injectors. If you could, check fuel pressure when the no start occurs.

If it is the injectors, buy a cheap "noid light" to check the injector circuit. Buy the one that fits your injector harness connectors. You pull off a connector to one injector and put the noid light in the connector. When cranking the engine over the noid light should be blinking-that is the pulse that fires the injectors. The injectors have battery voltage to them any time the key is on. When the ecm momentarily grounds the injector circuit (internally in the ecm), the injector is pulsed. If the noid light does not blink or even light up when cranking, the injector circuit has a problem in the power side or the ground side.

Feb 09, 2014 | 1991 Chevrolet C/K 2500

1 Answer

Flasher relay in a 98 mercury grand marquis?


The fuse block the relay is located in is behind the knee bolster, the trim panel under the steering column, left of the steering column underneath the dash. Common source of problems if that does not fix it is the Light Control Module ( LCM), turn signal switch unit, headlight switch.

Mar 08, 2013 | Mercury Grand Marquis Cars & Trucks

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I have a 2001 camaro with a 3800 v6 it cranks but wont start. no feul and the injectors are not firing. i can jump the feul pump relay and get feul pressure but the injectors will not fire.


The crank sensor is what pulses the ijectors,and makes the spark,so I would start at the crank sensor.Let me know how you come out.Check for any blown fuses also.Ecm fuse would cause this,but it may be called anything ,so check all fuses.

Sep 10, 2009 | 2001 Chevrolet Camaro

1 Answer

1993 s10 2.8 tbi the fuel pump fails to pressurize when the key is tunred on, and i have to fuel injector pulse. when a jumper wire is attached i can pressurize the pump but i still have no injector pulse.


There needs to be 60 PSI of fuel pressure in the system to have the fuel injectors to work. There is also a fuel pump relay on the fire wall just left to the brake booster, There is two relays there, i just can not remember which relay is which but try switching the relays with one another. Also check the fuses to the fuel pump and ECM, and the fuel pressure from the shredder valve. Good luck and keep me posted, not a bad Idea to also replace the fuel filter, and that is located at the inside frame rail under the drivers side.

Jun 03, 2009 | 1991 Chevrolet S-10

1 Answer

Mercury grand marquis


it is on the fender near the battery and is also referred to as the starter solenoid (if you follow the large wire from the positive terminal of the battery at the other end will be your relay/solenoid)
hope this helps!

Feb 28, 2009 | 1996 Mercury Grand Marquis

1 Answer

ECU appears to be dead


About a year or so ago, my 1991 240 Volvo was experiencing similar symptoms. Has this been an intermittent problem? (Sometimes starts, sometimes not?)
I looked at my fuses, especially fuse #6 which powers my fuel injector relay. With a friend, who is a professional mechanic, we determined fuel was getting to the injectors, but my coil spark was weak and injectors were not being pulsed. I wasted 300 dollars having the injector relay replaced, by another mechanic. Two weeks later, my car failed once again to start! It turned out to be a pitted connection at fuse #6! I inially just looked at the fuses, which were not blown, but when I took #6 out, it and the associated connector were pitted. Burnishing the connector and replacing #6 fuse has corrected this issue! If you haven't, pull your fuses, and inspect and clean the contacts! Maybe it's just that simple. Good Luck!!

Dec 01, 2008 | 1991 Volvo 240

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