Question about 2000 Mercury Grand Marquis
Yes the key could be a problem BUT your theft light would be flashing on the dash while you are trying to start
since you have fuel during the concern I am going to assume that you are missing spark?
if no spark you could be dealing with a bad CKP (crank shaft position) sensor
watch your MIL (malfunction indicator lamp) also known as the check engine light WHILE cranking
if the light is ON while cranking then your computer is not seeking the CKP
if the light is OFF while cranking then we can skip the CKP issue
Posted on May 23, 2010
The security module is constantly on and never off. It may be getting weak shorting out at times. A diode that flashes every ten seconds when the car is off can be seen. Watch the flashes when you can every hour or so and time the flashes. Moybe the diode will not flash at all at times you look. If so the security Module needs to be replaced
Posted on May 17, 2010
It sounds like the problem is very likely the IAC valve. It will cause problems exactly like this and won't show a DTC on a scan.
The valve pintle gets carbon deposits and a little engine oil on it that when it gets hot, like after being driven, gets sticky. Then when the valve needs to open at idle to provide air, it can't...until it cools down and isn't so sticky anymore.
The valve is mounted in the throttle body, and only just needs to be removed and cleaned. A throttle body cleaner or isopropyl alcohol and tooth brush will work. Also clean the mounting hole that the pintle will go into.
Posted on May 13, 2010
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Posted on Jan 02, 2017
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