Re: Extremely Loud in Morning, EBPV?
Just look around some on this forum, on the 94-97 forum and every PSD forum you can find. What you will find is that all over all the forums are descriptions of this problem. The descriptiopns may not be exactly the same but they all have shown up since the cold weather has begun. In colder areas the problem descriptions sound worse, in warmer but cold climate the symptoms sound less severe and in the Summer you never hear of it. Coincidence? nope! They are virtually descriptions of the same issue. That is, a change in the operation of the EBPV since colder weather began that is more noticeable, noisier, irritating and is described as a "whoosh, hiss, roar, miss, stumble, surge, loss of power when cold, no power when cold, truck won't move when cold, no power when I start in the morning, high EGT's in the morning, cycling boost pressure for miles when cold".
The fact is that most, if not all, these "problems" are related to the EBPV. My experience is that most operate differently depending on their condition, the quality of the inputs to the PCM, the size on the downpipe, the modifications to the intake, whether you moved the air temp sensor outside the airbox, etc, etc. and all factors that have an effect on the exhaust back pressure sensor reading, the oil temperature and the input air temperature. All those things control it's operation. The root cause is colder weather and it's effect on the operation of the valve.
Ever hear of the term "garbage in, garbage out" well that may be why the PCM is causing the EBPV to fuction weird on some trucks. You change the quality of the inputs to the PCM and you change the normal operation of the valve. Plugged EBP line, moved air temp sensor all will have a negative effect on the quality of the valve operation.
Larry P [img]/ubbthreads/images/graemlins/cool.gif[/img]
02 F250XLT SD CC LB 4X4, Silver, SD Air Lifts, 4R100, Westin Sportsman grill/brushguard, Leer Shell, AIS Severe Duty w/added fender intake, Edge EVO running 80 HP, ISSPRO's w/cubby mount, Rancho 9000X's, Banks 3 1/2" downpipe, BTM, 3 1/2" exhaust front to rear with 5" stainless tip. Sonnex and Tricum's. Fumoto Valve. Royal Purple ATF. Tru-Cool 4590. Tekonisha Prodigy. SP Diesel SSEBTC Exhaust Brake. Like new 88 Vacationeer 11.4' or 2008 Cardinal 31SB, 1992 Bayliner Trophy and the itch to go, baited hooks and the need to fish, loaded guns and the need to hunt.