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
9,585

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

Related Questions

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 1,780
#2 kbro
kbro
Reputation 1,030
#3 Tom Demyan
Tom Demyan
Reputation 440
View All

Related Models For Sale

Used Ford Crown Victoria"
37 Great Deals out of 1,566 listings starting at $1,695
Used Lincoln Town Car"
113 Great Deals out of 3,160 listings starting at $1,995
Used Chevrolet Impala"
1,937 Great Deals out of 57,410 listings starting at $1,000
Used Cadillac DeVille"
70 Great Deals out of 3,413 listings starting at $1,595
Used Toyota Camry"
2,067 Great Deals out of 73,889 listings starting at $999
Used Ford Mustang"
1,098 Great Deals out of 25,208 listings starting at $950
Used Ford F-150"
2,253 Great Deals out of 183,635 listings starting at $1,000
Used Ford Taurus"
647 Great Deals out of 19,330 listings starting at $700
Used Honda Accord"
1,404 Great Deals out of 73,643 listings starting at $1,000
Used Buick LeSabre"
108 Great Deals out of 3,597 listings starting at $995
Used Buick Park Avenue"
20 Great Deals out of 891 listings starting at $1,500

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
5 Great Deals out of 41 listings starting at $11,995
2010 Mercury Grand Marquis For Sale
6 Great Deals out of 119 listings starting at $10,895
2009 Mercury Grand Marquis For Sale
6 Great Deals out of 165 listings starting at $8,990
2008 Mercury Grand Marquis For Sale
22 Great Deals out of 321 listings starting at $3,999
2007 Mercury Grand Marquis For Sale
13 Great Deals out of 254 listings starting at $3,995