My Pete rebuild

[Nostalgic]

(05-26-2019 )Rawze Wrote:  how did you determine the rear bank is dead? -- The ECU is well known for failing the rear bank and not firing it for 10 minutes + at a time + key-off+ key-on if you unplug it, or it losses connection for even just a moment.

After installing all 3 of the actuators that I cleaned and tested, along with the "new" rear timing actuator, the truck started hard, and the thermal camera revealed that the rear exhaust manifold was cold. Shut it off and reinstalled the old actuator and the truck started easy, idled smoothly, and the exhaust manifold lit up in the camera.

I wasn't content with that alone, so I opened the "new" actuator and checked the plunger - .004" and it looked good. So I thought hey, maybe the plug was loose, or some other unknown, so I re-installed it to the same results. There was a distinctive tick from the fuel pump side - like a bent/bad valve on a gas engine, and the exhaust side sounded like an exhaust leak. With the engine still running, I unplugged the timing actuator and the sounds went away. Pluggin back in they came back. It wasn't the ecm shutting it off, the actuator was screwy.