Quote:
Originally Posted by Tony Silva
I would suspect that if the truck died instantly, you should first check the fuses in the fuse panel. Check to be sure that the fuses for the EMISSIONS system are all good and that the fuses for the pcm are still good, be sure to check the fuse to the fuel pump also.. If all fuses check out ok...then I would think the next thing to have checked is the crank shaft position sensor (CPS). The cps tells the pcm when to send spark to the spark plugs. If the cps is bad the engine will shut off immediately. Sometimes the engine will start right back up again though...and stall out at random times. I would use an "inductive" timing light on each spark plug wire to see if they are getting spark. If no spark, I would change the CPS. Also: Check for fuel flow. I would buy some starting fluid in an aerosol spray can and spray it in the throttle body with the flaps open and try to start the truck. If no start I would remove the electrical connector closest to the fuel pump and I would use a test light on the harness side of the connector to check it for power WITH the ignition key turned to the the run position. If there is power I would then remove the fuel pump and manually connect it to a battery to see if the pump turns on. But PLEASE NOTE...If you chose to wire the pump manually, be sure to wear eye protection...and connect the wire's to the pump FIRST and then the positive and negative on the battery AFTER. And keep in mind, this is a fuel pump and should be treated as a flammable item.
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Wow! Thanks for all the input! Well, last night I checked all the fuses and they all were good. Will go out later this morning to check out the CPS. I don't know if this is anything helpful, but last week after oil change, I put some Seafoam in the intake and days later the check engine light came on. When my wife got the truck home, checked with the code reader and came up as P0300, a random or multiple misfire. I did check the spark plug wires with my little tester/pen and there were two that looked "odd" and not firing correctly. Also, yesterday, there was a whining type of noise coming from the rear of the vehicle, I am supposing the tank area. The fuel pump is back there, and it never made this noise before. With the battery light and not check engine light coming up, I feel that it may be an electrical issue with the fuel pump. No codes present on the reader, either. If anything else is new, I will let you know. Thanks again for advice.