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1999 Mercury Grand Marquis - Page 5 Questions & Answers
What kind of mercury grand marquis suspension issues are there?
I am sorry but luckily I have not had any suspension issues other than tie-rods, which need to be replaced periodically anyway. I did do suspension work last summer replacing the front ti-rods , wheel alignment/balance and new tires but since then the ride has been good.
Run self test on heater control head 1999 grand marquis
sounds like maybe your dryer is plugged up .
follow the cold line with your hand .
or its working and the vent flapper is disconnected .
its the one that's tied to the front buttons / lever on front panel.
you should hear it switch between cold an hot as the flap closes opens. it will be definitely heard. it sucks vacuum an plops close/open.
more than likely you have a loose bad vacuum line/lever in dash.
Rough idle and hessitant when accelerating
Did you clean out spark plug wells? Sometimes when removing intake, coolant leaks into spark plug wells shorting out spark to cylinder wall instead of plug..check for coolant traces on coils.Could have weak coil.
Code p1451
Code 114512 is an evap code.shows to much pressure in fuel tank.try removing fuel cap and see what ha
Problem with 2000 Mercury Grand Marquis - interior lights come on and off
Your whole light system is controlled by a computer box located behind a panel under the steering column. Its not serviced, it has to be replaced. I hope your setting down, that box is close to $900.00 from a Ford Dealer. When it finely goes out it will take your headlites with it. If you have someone in the area that is good with automotive electrics he can wire in a normal headlite switch from an older model.
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