Intermittent check engine light
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I don't know how late I'll be up, but if you have more questions and no one else is responding, try asking down the the 99 - 03 7.3 diesel section for any questions you may have along the way. It's further down the main forum listing, or here's a link to it https://www.ford-trucks.com/forums/forum31/
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Senior User
Joined: Sep 2008
Posts: 269
Likes: 0
well i ended up not working on the truck that night and just took it to ford friday morning to get the codes read. They said that the transmission solenoid pack was bad so I took it to the transmission shop who rebuilt the tranny about 5k miles ago. It is under warranty so they are supposed to fix that for free. Anyway, here are the codes that they gave me. They said to fix the tranny solenoid pack first then go from there.
O/D
P0743
P1275
P1277
Engine
P0470
P0472
P0478
P0741
P0743
P1316
Do these engine codes seem to be the symptoms of the UCVH being loose?
O/D
P0743
P1275
P1277
Engine
P0470
P0472
P0478
P0741
P0743
P1316
Do these engine codes seem to be the symptoms of the UCVH being loose?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
P0470 Exhaust Back Pressure Sensor Circuit Malfunction
P0472 Exhaust Back Pressure Sensor Circuit Low Input
P0478 Exhaust Pressure Control Valve High Input
P0741 TCC Circuit Performance
P0743 Torque Converter Clutch System Electrical Failure
P1275 High to Low Side Open — Cylinder 5
P1277 High to Low Side Open — Cylinder 7
P1316 Injector Circuit/IDM Codes Detected
Yes the codes support an injector wiring (connector) issue. For the EBP codes you can try this Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page
P0472 Exhaust Back Pressure Sensor Circuit Low Input
P0478 Exhaust Pressure Control Valve High Input
P0741 TCC Circuit Performance
P0743 Torque Converter Clutch System Electrical Failure
P1275 High to Low Side Open — Cylinder 5
P1277 High to Low Side Open — Cylinder 7
P1316 Injector Circuit/IDM Codes Detected
Yes the codes support an injector wiring (connector) issue. For the EBP codes you can try this Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page
New User
Joined: Aug 2012
Posts: 1
Likes: 0
same kind of check engine light problem
so when my truck starts, i have a check engine light on. it runs rough, cant get up to speed and wastes lots of gas. however if i let it warm up for bout half an hour or so the engine does this rev by itself and then the check engine light goes off and it runs fine. im not sure if these fixes are the problem or if its something else. i was thinking of replacing the o2 sensor... is that the prob? also when its runnning crappy like that there is black puffs coming out of the exaust but not when its running good. im super confused on this issue because i have done the basics, new oil, spark plugs, and replaced cracked manifold.
HELP!!!
HELP!!!
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
so when my truck starts, i have a check engine light on. it runs rough, cant get up to speed and wastes lots of gas. however if i let it warm up for bout half an hour or so the engine does this rev by itself and then the check engine light goes off and it runs fine. im not sure if these fixes are the problem or if its something else. i was thinking of replacing the o2 sensor... is that the prob? also when its runnning crappy like that there is black puffs coming out of the exaust but not when its running good. im super confused on this issue because i have done the basics, new oil, spark plugs, and replaced cracked manifold.
HELP!!!
HELP!!!
But to help, read the codes, it will help point you in a direction. If a modular motor like the 5.4 or 6.8 and you are getting a misfire detected, I would look into the COP.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
How do you know that he is getting a misfire detected? It doesn't say that anywhere. The CEL on does not mean misfire UNLESS the CEL was flashing.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
I don't nor did I mean for it to sound like he was, I was just saying that IF he had a modular motor AND it was getting a misfire detection that's where I would lean. Just offering suggestions instead of simply saying "out of my forum".
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