Question about 1999 Mercury Grand Marquis
It cranks up fine but dies quickly when the engine is not up to operating temp. It runs fine at speed (even cold), but dies when idling and cold. I have already changed the fuel filter. Any ideas. I can not bring up any codes on OBD unit.
Here is the most common cause of this stall, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
Posted on Nov 06, 2008
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Posted on Jan 02, 2017
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