Question about Mercury Grand Marquis
There's an idle speed screw on the side of your injectors/carburettor. when you turn it clockwise it will slow the speed down. This should be a screw sticking out of the carburettor/injector pump with a spring around it's base, you should be able to turn it with your fingers but if its too hard to turn you will be able to get it with either a 6~8mm socket or a flat bladed screwdriver. There will be another one for idle mixture but you need to get the one connected to the throttle linkage. This procedure will be explained with details/picture in a workshop manual which i would recommend buying.
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
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