Multiple Trouble Codes
Thread Starter
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Mountain Pass
Joined: Jun 2018
Posts: 152
Likes: 32
Multiple Trouble Codes
Hey all,
Recently I have been showing multiple trouble codes.
1997 7.3
300,XXX miles
200/30 hybrid injectors
Electric fuel pump w/dual filters
EBP valve delete
Hydra Tow Tune Chip
Cold Air Intake
Recently I have been showing multiple trouble codes.
- P1391
- P1393
- P0238
- P1395
- P1396
1997 7.3
300,XXX miles
200/30 hybrid injectors
Electric fuel pump w/dual filters
EBP valve delete
Hydra Tow Tune Chip
Cold Air Intake
Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
- P1395
- P1396
- P1393
maybe hose fell off map sensor or has a split, easy one to trace from the passenger side intake to above the AC box
Thread Starter
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Mountain Pass
Joined: Jun 2018
Posts: 152
Likes: 32
Lead Driver
Joined: Mar 2006
Posts: 5,111
Likes: 1,544
From: western SD
Is your truck a California emissions truck? If it is, I think there is a shunt/buss bar that the GP leads to each bank bolt to, and the buss bar bolts to one post on the relay. That buss bar may not be making good contact sometimes causing the codes.
Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
Metal strip on the GPR going to the GPs
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Thread Starter
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Mountain Pass
Joined: Jun 2018
Posts: 152
Likes: 32
Yeah that checks out. Everything tight and no corrosion. I also am getting a P1000 code which makes me think that the MAP sensor is bad.
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Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
https://www.ford-trucks.com/forums/8...gpr-shunt.html
possible is shunt is good then a GP went out
diagram in post link above
possible is shunt is good then a GP went out
diagram in post link above
Lead Driver
Joined: Mar 2006
Posts: 5,111
Likes: 1,544
From: western SD
Take a multi meter and check the voltage on the always hot post, then the voltage on the other post with the key in the run position.If I remember right, you should see 1/2 volt or less loss between the 2 post while the relay is energized and working. By working I mean when the computer is calling for the glow plug to be heated. If the relay checks out, go to the wires on the shunt leading to each bank. You should see about the same voltage what you get on the post the shunt is on.
Thread Starter
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Mountain Pass
Joined: Jun 2018
Posts: 152
Likes: 32
It doesn't seem to be hot...warm maybe. I am going to just order a new one and see if that fixes the issue. From other posts I read that the voltage on the center shunt should be closer to 12v and mine is 10v. That's a substantial drop for sure.
Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
i think your contacts are worn if GPR is getting warm. That voltage drop will make the GPs not glow to their potential.
Did you clean all the conatc surfaces of the wires, washers, nut and posts? you would be amazed what a lil corrosion can do to heavy current flow
Did you clean all the conatc surfaces of the wires, washers, nut and posts? you would be amazed what a lil corrosion can do to heavy current flow