Exhaust Back Pressure Valve ?
There has been a lot of discussion on here lately about the EBPV.
The annoying valve has made itself known here the last couple of months since the weather has been cold, so I wondered what its real purpose was and if it was needed.
Fortunately the company I work for (Spartan Motors – recent article in Feb DP page 162) has an onsite MAXXFORCE (International, Navistar) engineer. I was picking his brain yesterday and asked him if he had any experience with the Powerstroke, particularly the 7.3. He laughs and said, take a bolt off of a 7.3, lay it on the table and I could tell you where it went. He was the Application engineer for the 99+ Ford SD.
I asked him about the EBPV and if it was really needed. His response; “Well 90% of the time it doesn’t work right anyway so no”. A diesel won’t warm up to operating temp on it’s own in a cold environment, unless the engine is under a load. He said the thought process was to induce a load in the exhaust to help the engine warm up. But they are plagued with problems. Plugged sensor tubes, leaky shaft seals, soft codes (no check engine light) and so on. So, for a short time International released a “warm climate” 7.3 that had a non EBPV pedestal and no block heater. But it was short lived.
I mentioned installing a non EBPV pedestal since my actuator is leaking and he said you’ll be hard pressed to get one from international but it won’t hurt anything.
I see him about twice a week so my next investigation is the CCV mod. I’ve heard people swear that it’s dumped in the intake to lubricate the turbo. I think it was just for emissions but I want to check.
If you have any questions let me know and I’ll see if I can get the answers.