got a 1999 Mercury Grand Marquis. the car runs fine until you hit the brake or turn on the headlights, which at that point it stalls and dies. what do I do?

Troy Shutt
0

Asked by Troy Jun 10, 2014 at 01:57 AM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

1 Answer

Tracy Hooks
13,215

I take it that there's no "Check Engine" light on? Remove the intake snorkel and clean the Throttle Body plate with Carburetor cleaner, a soft cloth and your finger. If you're careful, you can remove the Throttle Body for cleaning. NO ABRASIVES! You can also remove the two small bolts holding the IAC in place and clean the inside of it as well. Try to move the plunger inside of it while bathing it in carb spray also. Disconnect the battery to reset the computer. Assemble the vehicle, start and run the engine at 2500 RPM for a full minute or two (warm the engine) and allow the car to idle for 2 minutes. Set the brake and allow the car to idle in gear for 2 minutes. With the car in gear and at idle with the brake set, turn on the headlights and AC and let it run for 2 minutes. It's typical for the Throttle Body and IAC to become sludged over time and require cleaning.

Your Answer

Add photo

Related Questions

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 2,760
#2 kbro
kbro
Reputation 1,290
#3 Ratpuppy
Ratpuppy
Reputation 670
View All

Related Models For Sale

Used Ford Crown Victoria"
16 Great Deals out of 1,108 listings starting at $2,800
Used Lincoln Town Car"
57 Great Deals out of 2,245 listings starting at $1,495
Used Chevrolet Impala"
1,289 Great Deals out of 57,921 listings starting at $1,200
Used Ford F-150"
2,373 Great Deals out of 103,080 listings starting at $1,300
Used Chevrolet Tahoe"
766 Great Deals out of 24,523 listings starting at $1,955
Used Cadillac DeVille"
41 Great Deals out of 2,168 listings starting at $1,700
Used Ford Mustang"
701 Great Deals out of 35,220 listings starting at $1,950
Used Ford Taurus"
394 Great Deals out of 16,614 listings starting at $1,400
Used Buick LeSabre"
97 Great Deals out of 2,524 listings starting at $990
Used Toyota Avalon"
248 Great Deals out of 17,282 listings starting at $1,200
Used GMC Yukon"
305 Great Deals out of 8,301 listings starting at $1,500

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
3 Great Deals out of 47 listings starting at $11,977
2010 Mercury Grand Marquis For Sale
3 Great Deals out of 101 listings starting at $9,991
2009 Mercury Grand Marquis For Sale
10 Great Deals out of 175 listings starting at $6,991
2008 Mercury Grand Marquis For Sale
16 Great Deals out of 233 listings starting at $3,495
2007 Mercury Grand Marquis For Sale
14 Great Deals out of 173 listings starting at $3,990