Hi,

I recently purchased a 2003 Ram 1500 with 168,000 miles.

This is meant to be a beater that I purchased very cheap as is, the owner gave me a paper from an innova OBD2 scan tool that showed a code P0308, with a recommended fix of "repair engine wiring harness".

The truck starts and runs but it smells gassy. After replacing the battery I used a cheap chinese scan tool that I got off amazon and now I have P0172. I imagine the P0172 is just a generic rich code and the scan tool I have is just giving surface information, so its possible it will eventually throw P0308 again. and that is a more specific code related to the problem?

I checked the air filter and then went to clean the MAP sensor and noticed it has a wire missing




At this junction I'm assuming it's just running without a MAP sensor reading.

Would it be possible to just replace this specific connector, or would this indicate I need a new engine wiring harness?

Open to any suggestions as to where to start.

Thanks!

 

P0308 is misfire on cylinder 8.

P0172 is fuel system to rich, bank 1. (cylinder 8 is on bank 2.)

What engine ya got?

Pretty sure the map should have three wires....... might wanna pull back the covering on the harness there a bit, and see if you can find that third wire.

 

Ya from my preliminary googling it does sound like that connector should have a 3rd wire going to it.

Engine is 4.7L.

Good call on looking for the other wire.

 

Yep, should be three wires.

Violet with white trace, Dark Green with Red trace, and Black with light blue trace.