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Old 03-29-2018, 04:52 AM   #1
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Hemi won't start

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?

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Old 03-29-2018, 05:59 AM   #2
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Old 03-29-2018, 06:07 AM   #3
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Those are the readings you should get unplugged on the pigtail that’s normal. Have you checked for fuel pressure? Also make sure the two plugs at the rear of the intake drivers side are pushed all the way together as they can be a real pain sometimes to hook up.
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Old 03-29-2018, 06:26 AM   #4
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Those are the readings you should get unplugged on the pigtail thatís normal. Have you checked for fuel pressure? Also make sure the two plugs at the rear of the intake drivers side are pushed all the way together as they can be a real pain sometimes to hook up.
Thanks for the reply.

When I turn on the key I can hear the fuel pump come on for a couple seconds and come up to pressure. I haven't actually checked the pressure, how is that accomplished?

Also, I'm not sure which two plug you're referring to.
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Old 03-29-2018, 07:16 AM   #5
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What year 5.7? High circuit often means a open circuit. You have multiple high circuit. This points to a plug not connected properly.
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Old 03-29-2018, 07:35 AM   #6
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What year 5.7? High circuit often means a open circuit. You have multiple high circuit. This points to a plug not connected properly.
It's a 2004.

I assumed that high circuit meant too much voltage on the signal wire.
I've checked the connectors already but another check won't hurt anything.

Thanks.
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Old 03-29-2018, 01:45 PM   #7
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If a O2s heater element burns out it will give you a high voltage cpde. Same with map, ect sensors. 5v sensor voltage is shared among sensors and its ground is filtered suppose to be dedicated to sensors. Low noise... sometime an external ground wire added helps connected from pcm housing to head and throttle body housing bolt. Plug pins can sometimes be bent. Check o2s wires making sure they aren't touching exhaust.
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Old 03-30-2018, 04:14 PM   #8
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Old 03-30-2018, 09:50 PM   #9
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