Question about 1996 Ford Crown Victoria

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1996 grand marquis fouling plugs fast

Bought car w/ 100k miles.did basic tune up. at 135k fouled plugs so bad did not want to start. replaced coil packs,wires,and plugs again. ran great for bout a week. now wants to stall again. check engine lite said both banks runnin lean. friend had similar trouble said he found vacuum leak in a hose that runs from intake tube to back side of throttle body. found no leaks. any ideas on where to go from here? thanks for your help.

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The upper intake gaskets leak on these engines, here is how to check this, get a can of carb spray, spray all around the engine top, esp around the upper intake/plenum gasket area, if the engine RPM changes you have a leak.

Posted on Oct 22, 2008


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