The engine will stop when I turn the ac on. I can figure it out. FAn will start working, but ofcourse the ac itself will not cool, because the engine goes out.
With the engine off, key off, try to turn the front part of the AC compressor (not the pulley and belt, but the front part of the clutch). If it cannot be turned, the compressor is seized up and needs to be replaced. If it turns freely (there should be a little resistance, but turn easily by hand), the problem may be electrical- A short in the wiring, or defective engine ECU.
SOURCE: Crown Vic will turn over but not start
first do you hear your fuel pump running? if you don't more then likely the relay may have went bad. second check your connection to your coil's..make sure there clean and tight..and getting back to the fuel problem if you hear your pump running then it could be the fuel filter clog...try this and let me know....
SOURCE: 1988 Ford Crown Vic Strange Idle
When you turn the key on does the check engine light come on? If not it may be burned out. It sounds like a MAP sensor or an O2 sensor is bad. I would suggest taking it to autozone as they do free diagnostic and seeing if a code comes up. If it is a sensor it should, if not it may be the idle sensor not reading right in the ECU. More than likely it is one of the sensors though.
SOURCE: 1999 FORD CROWN VIC. 4.6 - PROBLEM, NOISE
This is caused by the IAC valve. Over time the valve becomes gummy and inoperative. Get it replaced and the problem is solved. IAC stands for idle air control, hence the stalling concern.
SOURCE: 97 Crown Vic transmission issue
Check the transmission linkage cable that runs from the steering column under the dash to the trans under the car. make sure that the cable is not damaged and that all connections are tight.
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