Turbo sounds like creating back pressure - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 12-04-2007, 01:46 PM Thread Starter
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Turbo sounds like creating back pressure

You know how when you start the wonderful 7.3 in the morning, and you get the turbo to blow off "phhhhhhfffffff" like air comming out of a rigs tank, blow off valve. well every once and a while when i start it up and drive the turbo wants to, i beleive create back pressure and blow off, it happens around 1500 rpm and there is lack of power durning this. to remidy this i get the rpms higher to bout 2000 then it blows offf and turbo sounds fine. or is this a valve that is not opening and closing when it should???? have any of yall had this problem????

1997 F-250 Crew Cab 7.3 4x4 (truck built 12-97)
2 - 8" Mitre cuts
Bully Dog 6 pos chip
Dfuser 18K module
FPR shimmed
RECON Smoke AMBER roof lights
Fire and Ice lightbar under tailgate
ITP Overboost Annihilator

Not running fire company at the moment but still on the truck
2 - 5 ft. FireStik Antenna's hooked into BC 350c Scanner
Vector 7 pod

Soon to be on truck:
Intercooler, new HPOP, straight axle, New OBS starter
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post #2 of 3 Old 12-04-2007, 07:00 PM
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Yes, this is normal. It is the EBPV (exhaust back preasure valve). It creates back preasure when cold to warm engine when cold. Louder with dounpipe and strait pipe.

96 350 Reg.cab 7.3 5sp. 4x4
3.5 to 4in dp, 4in strait pipe
4in Superlift w/ Airlift airbags on 315/75/16 Procomp X-Allterain W16x10Procomp wheels
Ba### Technicooler(the bad word)
Boost & E.G.T. Guages
Superchips programer(for now)
fpr mod
d.i.y. intake
South Bend clutch

79 150 4x4 (my wheelin truck)
420ci M motor,c6
4in lift, 35x12.5x15 Mud Terains
was old driver too much $$$--6-9mpg of premium(11.5to1)
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post #3 of 3 Old 12-04-2007, 07:14 PM

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If its doing this after the truck is up to temp, then the ebpv is sticking.


2011 F250 Crew Cab FX4

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