Question about 1986 Mercury Grand Marquis

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Where is an IAC valve located on a 1986 Mercury Grand Marquis?

Where is the IAC valve located at on a 1086 Mercury Grand Marquis?

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Posted on Jan 02, 2017

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  • 15 Answers

SOURCE: 1986 mercury grand marquis LS overheating

Any car sitting that long is going to have some issues. It could be several things. The thermostat could be stuck closed. The radiator could be stopped up. The fan clutch could be inoperative. The waterpump impellar could be deteriorated to the point that it will not circulate coolant. The worst would be that a head gasket could be bad and causing to overheat and misfire. The first thing to do is replace the thermostat and purge any air from the system. Use water and not coolant to verify the repair. If this solves your issue you can drain the water and fill with proper amount of coolant. I must recommend checking for white cloudy smoke from the tailpipe as it is a sure fire sign of a blown headgasket.

Posted on Aug 11, 2008

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SOURCE: rear shocks on a 1996 Mercury Grand Marquis

2 bolts on the top of shocks and 1 bolt on the bottom but the top 2 bolts are a pain in the neck

Posted on Mar 10, 2009

  • 1986 Answers

SOURCE: how to remove the egr valve on a 1993 mercury

Jack up the passengers side of the car, get a 1 1/16" wrench break loose the fitting to the manifold, hold a 24 mm wrench on the fitting to the manifold, loosen the flare nut on the tube. Then using a 10 mm socket, about 2 inches long, loosen the two nuts under the EGR valve, then take the both out, remove the vacuum hose to the top of the EGR valve, and the sensing line from the small tube. then completely remove the flare nut from the orifice fitting on the manifold. BE CAREFUL with the tube, do not bend it or break it, you may find PB blaster useful the night before on a cold engine loosen these fittings. Once the EGR valve is out, remove the orifice out of the manifold, remove the tube from the EGR valve, again be careful, mark the tube to EGR position before pulling this off, because the top fitting to EGR needs tightened before you put it back in, it will make the lower fitting difficult if you do not line it up right, dry fitting from under the car is helpful, mark it, and then tighten the top. Clean out the tube, be careful not to bend the little tube, either inside or outside the larger tube, it sticks out inside. Clean the orifice, clean the manifold face carefully not to score it, check for blockage there too. Apply anti-seize to the orifice, put it back in the manifold, then apply anti-seize to the bolts for the EGR valve, and the flare nuts both ends. Apply some silicon to the EGR valve face, just enough to hold the gasket in place, put the new gasket on, start the bolts two turns in the gasket, it will hold them in place, then start them in the manifold, then start the lower flare fitting to orifice, tighten the top bolts, and then the flare nut, connect the vacuum line, connect the sensing line. I just recently did this process, it works, if have other EGR issues, the valve is the easiest.

Posted on Oct 13, 2009

  • 58 Answers

SOURCE: where are the spark plugs located on a 2000 Mercury Grand Marquis

There are eight COPs (coil-on-plugs) to remove. Using a 7mm or 9/32" socket, remove each bolt securing each COP to the intake manifold on top of the engine. Remove all eight COPs, and the spark plugs are underneath. When replacing the spark plugs, use only the proper Ford/Motorcraft plugs, even if they cost twice as much as the aftermarket ones. You will avoid further headaches this way. Hope this helps.

Posted on Mar 30, 2010

  • 564 Answers

SOURCE: how to replace starter +1993 Mercury Grand Marquis

disconnect battery,,jack car up,,put jack stand on frame,,take starter bolts out,(may not be easy),,take wires off starter,,hoped it helped,,

Posted on May 08, 2010

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1 Answer

Where is the IAC VALVE located on a 1992 mercury grand Marquis


Should be attached to throttle-body. two wire connector, wire colors, red, and white with lite blue tracer.
iac 1-d0y1d1jyikdpmr2b2xh0kfds-4-0.jpg

Feb 23, 2017 | 1992 Mercury Grand Marquis

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1986 mercury marquis 302 distributor burns out


Make sure your audio and video connections are in proper ports and cable is properly connected.

Aug 17, 2013 | 1986 Mercury Grand Marquis

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1993 Mercury Grand Marquis Idle air control valve hose makes a buzzing sound. I replaced the IAC and it seemed to be better for a short period of time, after a couple of drive cycles, now there is a...


I have replaced many of these valves for the same noise problem, only one thing comes to mind the throttle body is full of sludge and restricting airflow, clean it with throttle body cleaner and a soft rag, then disconnect the battery for 5 minutes to reset learned idle strategy, if that doesn't clear the problem you either have a defective valve or you have the wrong part, there are about 4 of these valves, the correct valve for your car looks like this one below. I also will include Motorcraft part #

MOTORCRAFT Part # CX1660
emissionwiz_206.jpg

Aug 16, 2011 | 1993 Mercury Grand Marquis

1 Answer

Cant find flasher for turn lightswhereis it


1986 Mercury Grand Marquis 5.0L FI 8cyl. the Flasher is located in front seating area, driver side, under dash, driver side of steering column, mounted in fuse panel (turn signal) and front seating area, driver side, under dash, driver side of steering column, mounted in rear of fuse block (Hazard flasher).

Jun 13, 2011 | 1986 Mercury Marquis

1 Answer

1986 Grand Marquis..........can not find the location of the fuse panel to change the signal flashers


1986 Mercury Grand Marquis 5.0L FI 8cyl. the Flasher is located in front seating area, driver side, under dash, driver side of steering column, mounted in fuse panel (turn signal) and front seating area, driver side, under dash, driver side of steering column, mounted in rear of fuse block (Hazard flasher).

Hope helps (remember to rate and comment this).

Sep 23, 2010 | Mercury Grand Marquis Cars & Trucks

1 Answer

How do i remove and clean the IAC


Operation

The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed. Do NOT attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.
The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Removal & Installation

  1. Disconnect the negative battery cable.
  2. Detach the IAC solenoid connector.
  3. Remove the two retaining bolts and remove the IAC solenoid and gasket from the throttle body.
  4. Installation is the reverse of the removal procedure. Use a new gasket and tighten the retaining bolts to 71-97 inch lbs. (8-11 Nm).

Nov 28, 2009 | 1999 Mercury Grand Marquis

1 Answer

Fuse box location


driver side dash at knee level

May 25, 2009 | 1986 Mercury Grand Marquis

2 Answers

92 Grand Marquis chugs and dies when at an idle. Also jerks alot


The throttle speed control valve must be cleaned. The valve is located near the throttle body throat. It has an oval flange with two bolts. Unplug it, take it off and clean it out with throttle body cleaner. You will notice a big difference. This is a common issue with this engine.
Please remember to rate this fix.

Feb 16, 2009 | 1992 Mercury Grand Marquis

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