Compression Ignition Addict
Join Date: Feb 2013
Location: Moses lake, wa
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For more replies, you might try moving this over to the 99 - 03 forums.
OBS trucks have what is called a EBPV, or exhaust back pressure valve, just a fancy name for a exhaust brake that is controlled by the pcm. When it is cold out, the pcm closes it to decrease warm up time.
I do not know if Super duty's have these, just An Idea. How long do you let your truck warm up before you start driving It? If It is still making jet airplane noises after it comes up to temp, there could be a malfunction in the circuit that controls it, or it could be hanging up. I know on OBS trucks it is simple to wire in a switch to control It manually, but again, not sure on yours.
Axel --> 16yo
96 CCLB srw. built E4OD, Diy E-fuel, Autometer gauges
4:10 lsd, Toyo M55 on stock steelies
Future plans include diy Traction bars, and zf5 swap.