Resolution to this issue:
Truck would sometimes buck. Bucking began to worsen with time. Sometimes bucking would happen on the highway and would buck once or twice. Sometimes more. As time went on, the bucking would be worse at slow speeds. Sometimes the battery light would illuminate for half a second and when the truck would buck more violently. At the worst point, the ABS light would come on for a second as well. Sometimes the fuel guage would be erratic. All of these symptoms would be intermittend. Sometimes I could go for a week without issues. No SES light durring these times. Truck would run great at an idle and run great most of the time. Moisture seemed to increase or cause the issue to worsen. Multiple misfire was the only code the computer was showing.
I had previously replaced the fuel pump in the summer prior so I didn't think that was the issue. I replaced the plugs and wires as the "multiple misfire" code indicated a spark issue. Still had the issue. I replaced the fuel filter and battery. Still had the issue. I replaced the cap and rotor and still had the issue. Replaced the coil and still had the issue. Replaced the Fuel injection Spider (CSEFI) with the new MFI (Multiport Fuel Injection) conversion unit. They changed the style in 2003 to this newer injection system. Still had the issue. Replaced the alternator and still had the issue. In the end, I finally had a code to go off of P0339 - Crankshaft Position Sensor - Intermittent. I changed the Crankshaft Position Sensor and all my problems/symptoms went away.
Summary of parts changed in the end:
Plugs & Wires
Cap & Rotor
Fuel Injection Spider (CSEFI) [used new CSEFI to MFI conversion]
Crank Position Sensor
While I understand that just because this issue was resolved by my replacing of the Crank Position Sensor and it may not apply to everyone else, I would strongly recommend replacing the Crank Position sensor before spending the money on all the parts as I did. Hopefully this will help others that may be having these symptoms. A crank sensor is about $60. Better than replacing all the other parts. If you get the multiple misfire code and you have already done the plugs, wires, cap, and rotor. Then the Fuel Injection spider can also throw that code as well. In the end. My issue was electrical. I cannot beleive that one sensor could screw so much up and create so many symptoms. That one sensor made me think I needed a new computer. I almost made that plunge as well.
Tuesday, February 17th, 2009 AT 3:40 PM