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1999 Mercury Grand Marquis Questions

Get answers to questions about your 1999 Mercury Grand Marquis at RepairPal. Find solutions, diagnose problems and get back on the road.

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105
questions

I put on a new intake manifold on my Grand Marquis GS 4.6 Litre, made sure the wires were right and cranked it up. The engine begins running rough after it has run for a few seconds. OBDII shows no codes after multiple tests. It feels like a cylinder is misfiring. Any ideas?

in the morning i go out and start my car. within a minute it start to idle down then back up then down it contiues this until its warm if i was to drive it before it warms up it would not idle down when i come to a stop. i would have to tap the gas.

when started runs fine at idle dies when put in gear when cold till warmed up no vacuum leaks have already replaced idle speed control valve no check engine light is on no codes at engine diagonstics

Is there a delay switch or fuse that causes this?

My speedometer, oil temp and battery voltometer are not working, fuel gauge is working fine. Fuse number 13 is blown, but radio, lights and indicators are working fine. Is it safe to drive the car?

My headlights, dome light, and turn signals do not work. All other electrical functions are fine.

My grand marquis hesitate when hitting 33 miles per hour why?

Driver side

I cannot unlock or lock the doors automatically or manually. What is the problem and how can I fix it?

I just want to know which fuse to pull to temporarily solve the issue. Thank you.