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The 1990 grand marquis 5.0 has what they call an "AIC" motor. It's located on front left side of throttlebody. It has a PINCLE valve inside that gets dirty. Take it apart and clean with throttle body cleaner and disconnect the battery, wait 10 min, connect battery, start it up and let it idle for 5mins , then take it out for a brisk ride to let the CPU relearn.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThis is not something that can be done by an amature. You need a timing light and tools. Take it to a mechanic to get it done right.
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Why does a 1990 mercury marquis stall when placed in reverse?
check your idle air control valve
What control the cold idle speed on a 1992 mercury grand marquis?
the cold idle is controlled by the PCM ( power train control module) the computer of the car and idle is not adjustable.
What if your 1999 grand marquis will not idle what is wrong?
check your air idle control valve
Is replacing an idle air motor on a 1997 Mercury Grand Marquis easy enough for a novice?
Please be more specific ....what is an "idle air motor"...I have 25 years experience and have never heard of it???
Where is the idle speed control valve on a 1985 mercury grand marquis?
This year had a central fuel injection with the idle speed on the side of the throttle body in the form of a D.C. motor with mechanical adjustments.
1990 mercury grand marquis cruise control doesn't work?
check fuses then refer to the speed control sensor which is on the throttle body closest to the air intake hose that controls the engine idle and speed control. Good luck.
Where is the idle air control located for a 2001 grand marquis?
Open the hood of the car and find the idle air control valve. The valve is located on the Gran Marquis' throttle body. The idle air control is a cylinder with a wire connector plugged into it. If needed, refer to your repair manual for an exact diagram. Read more: How to Clean the Idle Air Control Valve in a 2001 Grand Marquis | eHow.com http://www.ehow.com/how_7649344_clean-valve-2001-grand-marquis.html#ixzz1eqCpBmRx
Why would a 1999 Mercury Grand Marquis start but then stall right away?
Likely the fuel filter is clogged so you need to change it. If you can keep the engine running by pumping throttle a few times at start up, and then it runs, check the filter; cost about $10.00. On My 1999 Mercury Grand Marquis I had to replace the Idle air control valve because it did stay running until it was warm
How do you replace the idle air motor on a 1997 mercury grand marquis and is it something an amateur can do?
Idle air controllers are held on by two screws on one side of the EGR block. Remove the two screws, discard and replace the gasket and reattach. Should take about 10 minutes.
Why would a 1995 Mercury Grand Marquis have high idle?
Try adjusting the idle using the idle screw on the butterfly valve of the air intake. It might be that the idle is just set too high. If that doesn't work, try adjusting the timing. If that still doesn't work, try replacing the Throttle Position Sensor, located right above the throttle body.
Why is your 2002 mercury grand marquis making a loud moaning sound in the throttle body and air filter box?
It is the I.A.C. (idle air control) located inside plenum. Dealer normally stocks this part. approx. $50.
What do the dtc codes 12and 13 and 74 for a 1990 merc grand marquis 5.0 stand for?
12 and 13 are idle speed controller malfunctions. 74 indicates that the brake pedal was pushed while reading the codes.
