3 weeks ago
Last June my 5.7 Hemi with 290k miles died. I purchased a remanufactured engine and had it installed. It ran great but the red lightening bolt was flashing and the mechanic said it needed a new throttle body but it would be fine like it is. I drove it like that for 12k miles but suddenly it had a couple of episodes where it was very difficult to start and then finally wouldn`t start at all. I purchased a new throttle body and replaced it, following the instructions on programming it. The throttle body light was still flashing but it started and ran fine for another 1000 miles.I was driving it recently and while driving down the road the engine just shut off. As I coasted I put it in neutral and simply restarted it with no problem. This happened about 5 times until I reached my destination. About 6 hours later it started right up but about a mile into the trip it stalled for good.
Here are the codes that I got:
P0038 H02S Heater Control Circuit High Bank 1 Sensor 2
P0108 Manifold Absolute Pressure Sensor High Input
P0118 Engine Coolant Temperature Sensor 1 Circuit High
I`ve consulted the local experts and have followed their advice. First I replaced the PCM but that was no help, wouldn`t start. I also changed the MAP Sensor, still no help. It won`t start.
An interesting thing that I noticed: The plug going to the MAP sensor has 3 wires in it. They are for 5 volt positive, ground, and signal. I checked them with a multimeter with it disconnected from the MAP sensor and got these results...5 volts on the wire providing power, a good ground on the center one, and 5 volts on the signal wire. It would seem to me that I shouldn`t get anything on the signal wire, that it should receive a certain amount of voltage between 0 and 5 volts to send back to the compouter. Am I right about this?
I`m at my wits end and don`t know what to do next. Sorry for the long post, I wanted to provide as much information as I could. Anybody have any ideas?