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Hello, what engine is in the explorer a 4.0 SOHC or 4.0 OHV engine. Are there any warning lights on when it runs and does the red THEFT lamp flash fast when you try to start it and it wont run?
Ok. The theft system apeears to be working ok. So next question is when it doesnt start does it crank over normally or the starter wont turn over the engine? If it does crank and wont start do you have fuel pressure and ignition spawk?
That is possible which is why I was asking if you were getting fuel to the fuel rail, a fuel pressure test would be in order along with verifying if you have good blue ignition spark. If the check engine light comes on when the key is turned to on and goes out while cranking is normal operation and a good indication you have an engine rpm signal from the crankshaft position sensor to fire the coil and the fuel injectors.
Ok on the older models it should come on when the key is turned to on and go out when cranking the engine. If it comes on and does not go out you probably have an issue with the crankshaft position sensor.
Because as temperature increases. resistance increases in an electronic componet, so once its hot it can be not working. Also evidence of a cooling system leak on the sensor can cause it to fail if say a water pump ever was bad and leaked onto it
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