Compression Ignition Addict
Join Date: Jul 2010
Location: Falls Chruch
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This is NORMAL. I repeat, NORMAL.
It's the exhaust back pressure valve. EBPV. It's designed to help the truck warm up faster by restricting the exhaust. They include a small book in the glove box that tells you about this and many other normal functions. We call it the owners manual.
If you're too impatient, you can plug in the truck in or delete the EBPV. I'd recommend a lot of searching of the forum before doing either. You may electrocute yourself.
Nonconformist. Functionality over bling.
My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.