7.3 when cold

[MidwestOffroad]

I am real green /newbie to diesels

I have the 2002 7.3 with AT and i was wondering when the temps are down under 30 degrees will teh truck not allow you to overdrive itself untill it is propperly warmed to a set temprature.

Kinda of a fail safe thing to protect the motor.

I notice last nite that it didnt seam to want to accelerate over a given speed till i went about a additionl block or so.

[RopinandRidin]

Sounds like your ebpv (exhaust back pressure valve) was still closed or partially closed for a little bit. It is a valve in the exhaust system just beyond the turbo that is controlled by a few different things including oil pressure and restricts the outflow of exhaust to help heat the motor up quicker. As long as it's opening back up pretty quick, it's no problem.

[MidwestOffroad]

I just threw my code reader on it and your right i had a P0470 code Exhaust Back pressure sensor circuit malfunction...


You think it was due to maybe not warming up long enough.

[steph38]

Originally Posted by MidwestOffroad

I just threw my code reader on it and your right i had a P0470 code Exhaust Back pressure sensor circuit malfunction...


You think it was due to maybe not warming up long enough.

I agree let it warm up bit more i have the same problem when i'm late

[MidwestOffroad]

Thanks for the help!

[RopinandRidin]

Yeah, as long as you figure you might just be jumping on it a little quick and it's not sticking or still doing it as the weather begins to warm up, I wouldn't worry. Those things do have some potential problems where they will stick shut when they shouldn't but I wouldn't worry about it yet.

[MidwestOffroad]

Thanks again , I still have a lot to learn.

[Lord Tauk]

Letting it warm up 10 minutes during a cold morning on a cold motor wont hurt anything, it'll automatically high idle aslong as it's cold enough and +1 on what everyone else said.