On a recent trip, my truck started missing. The SES light would occasionally come on and the truck would run rough. The frequency of this seemed to increase. I found an auto parts store and checked the codes and came up with the following: 17,18, 35. In an effort to fix this, I Changed the PCM to a SS Diesel unit which consists of a Standyne PCM mounted on a heat sink mounted to the upper intake bolts. After installing this on a test drive the SES light returned. I then changed the fuel filter. Still the SES light came on.
Currently, when I start it seems to run fine for a while. After about 10-15 minutes of driving and usually under part throttle acceleration, it will miss and set the SES light. When I read the codes I seem to consistently get 18, 35, and 54. I have taken the following steps to try and address the issue 1. Changed fuel filter again. 2. Changed out the lift pump with a NAPA unit. 3. Checked battery connections. 4. Removed the upper intake and removed the black filter unit and checked the wiring as best I could. 5. Re did the ground from the wiring block on the firewall to the engine. 6. Re seated the connectors going to the ECM behind the glove box. None of these seemed to have any effect on the problem.
Any comments or suggestions as to where to go from here would be much appreciated!