Soooooo. I recently put a new motor in my jeep, 1000 miles in, and it blew the head gasket. Did not want to pull the motor agian and send it back to the manufacturer so I just did the head gasket job. Jeep is ruining well now, however, it is shifting gears at 4000 rpm. I removed and cleaned the throttle body and adjusted the tv cable... nothing. In fact, the tv cable does nothing in general. No matter how I set it, the jeep still shifts the same way. The only code I'm pulling is p0505, which dose not relate to the shifting issue. Any advise???

 

Start by testing the TPS sensor for ground, power, and a signal sweeping from roughly 0.25 volts up to 4.8 volts as you open the throttle. It's sensitive to water and solvent intrusion, and can get messed up if you didn't protect it when pressure washing the engine bay or cleaning the TB. If you pulled the engine out, verify that you got all the ground wires reattached over by the dipstick mounting bolt.

The TV cable does not control when it shifts, but rather adjusts the hydraulic pressure in the trans, causing it to shift firmer when you're on the gas. It's good to check and adjust it though, because being too loose will can cause sluggish or even no shifting. When to shift is primarily controlled by the TPS and the trans output speed sensor.

The P0505 points to an IAC issue, or perhaps a vacuum leak. Miss reconnecting a vac line, or the intake not sealing to the head?

 

The ground tested 0, and the constant tested 5w. The center wire test 3.5 wide open and was smooth. Is 3.5w were it should be?

 

The ground tested 0, and the constant tested 5w. The center wire test 3.5 wide open and was smooth. Is 3.5w were it should be?

 

3.5-volts at wide open is low. It should be ranging from 0.2-0.4 up to around 4.8? Throttle opening all the way (TV cable too tight)?