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A grand marquis wiring diagram can be found in a Chiltons or Haynes auto repair manual.
crankcase ventilation
The 1985 Mercury Grand Marquis has a varying curb weight. It can be anywhere between 4,118 and 4,137 pounds depending on features.
it's located under the steerinf wheel its a lil silver box with 2 wire plugs
Anything's possible (...but why?)
A person should know the firing order of their vehicle. The firing order of a 1985 Mercury Grand Marquis engine is 1-5-4-2-6-3-7-8.
Measure from the center of the front wheel to the center of the rear wheel.
Yes it will fit.
yes with a lower tire aspect ratio
NO
I am guessing that this vehicle is the Marquis and not the Grand Marquis. I'm also guessing that it's a 6 cylinder engine. If I'm wrong, go to www.autozone.com and look under repair info, specifications, firing order for your specific vehicle. FIRING ORDER 1-4-2-5-3-6
Check the fuel relays there are two of them on the driver side fender under the hood in a small plastic cover.