My car will not start I took it to a mechanic they said it might be the crown sensor they replaces it with a new one now they say they think its a electrical problem. What could it be?
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Find another mechanic.. First, if the harness is bad, it is almost impossible to diagnose a bad computer. I diagnose cars. I start with power and grounds first. Then check wires for continuity. Check sensor and actuators for resistance. I get 1 hour to do this. Usually do it. Sometime the harness is bad. it requires more time. Being a ford... I would start with cleaning the maf sensor and the throttle body. Look at replacing the fuel and air filter.
Wow, this is a broad question and I side with your mechanic on this one. I think a sensor is shot. There are a couple of sensors involved with your car's performance. They, in turn, interact with other sensors so that everything operates in unison. In others words, if this sensor, you can call it the kick-down sensor, if you want to, isn't reading the proper positional information from your throttle -- starting about 1998 Ford was using a great many electronic circuits and sensors for performance, rather than just mechanical systems -- then it isn't telling the ECU (electronic control unit or the vehicles "brain") the proper information. In turn, the ECU can't order other systems to fire or work in the proper sequence.
Given all of this, it is little wonder that your Crown Vic isn't performing well.
I would suggest having this range of sensors looked at, the Mass Air Sensor, the Idle Air Bypass Sensor, the Throttle Positioner Sensors and the like. Granted, some of these sensors (Mass Air and Idle Bypass) are more for idle and low-speed performance, but you just can't tell when one or more of them may fail and interact with other sensors in the change. I think the most likely candidate of the bunch is the Throttle Positioner. If the ECU isn't reading throttle position correctly then performance will suffer.
One other possibility -- and this is a thought -- is to have the EVP sensor checked as well, though this one is more involved with emissions than other things. Still, it could affect your Crown Vic's performance.
There is a bulletin on this vehicle. Involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (WJO1CAL15C, DNO1CAL 14D).
If you have the wrench light on your dash, that means you need to take your car to the dealership and have the car diagnosed. The computer is sensing that something is wrong with your car and the only way to tell is to visit your dealership and have them use a diagnostics computer to read the problem.
buy a cheap volt meter check voltage on both sides of the starter seleniod on the fenderwell if you have 12 volts on both sides while cranking test voltage at starter if you have 12 volts at starter with fully charged battery and it doesnt start you will need a starter it also sounds like you might need an alternator once you can get it started
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