96 Detroit 12.7 IAT sensor problems

Fuel lines might be cracked and sucking air. Mine does it sometimes, every since I had it overhauled. Worst at 1550-1600. I can sometimes make it happen, holding it anywhere between 1400-1650. Worse when fuel filters are bad. I think it’s the line between fuel filter and fuel pump. Could be my fuel mixing ( shutoff ) valve on top of Drivers tank. They’re known to real havoc. Mine is 20 yrs old. My mechanic had the same problem on his, replaced the valve, and fixed the problem. I haven’t figured it out yet. It seldom does it. I think the old line was disturbed during the inframe. There’s an easy way to pressurize tanks, using a shop rag, and air blowgun with one fuel cap off, other on, vent tubes blocked. Any leaking lines should bleed fuel, from the pressure. Don’t need much, 10 lbs, or so.

 

There’s a module on my 01, at the bottom of the fuse box. I forget exactly what it’s called. One of its features is running the fan, when bad fan runs too much. I forget the details, but it’s purpose is to take place of 4 engine sensors. I’m wondering if yours being a 01, engine a 96. Maybe the 4 sensors were set up accordingly, I’ll try to get a pic later. I’ve read up on it. It’s been explained to me, on this forum somewhere. Can’t miss the small box in fuse panel It says pdmi, or something like that. I’d have to look it up again. Wish I had more info.

 

Power distribution module.

 

I have the same problem can you tell me how to solve it or I appreciate if you help me

 

I have the same problem can you tell me how to solve it or I appreciate if you help me

 

Usually if someone figures out the problem they don’t share the information for some reason. If you are asking for help, you should also give help. It’s not that hard to list your solution, I’ve found this to be the case most of the time

 

I have a 12.7 reman engine with 200000 miles on it and it misfires and won't hardly pull itself. Interstate Detroit says the injectors test good and sent us away. Read a post about putting a 10k resistor in the white wire of the intake air temp sender so I tried it and it runs fine, take it out and it misses and chugs and won't hardly pull itself. Put it back in and runs good. I know this is only a band-aid so does anybody know the reason for this?