powerstroke straight pipe

7.3Diesel · Jan 4, 2013

Hello, i straight piped my truck a few months ago,nad just deleted the muffler. Usually, when it's cold it makes a really loud SSHSHHHHHHSSSSSHHH sounds until about 1200 rpms and then it goes away.

whats causing this....is it normal or what

johnholman · Jan 4, 2013

It's the ebpv staying closed. I'm not sure how to fix it I deleted mine.

Halvy85 · Jan 4, 2013

:whs: they have a bad problem with sticking closed. I deleted mine on my 00 as well.

sniper_101 · Jan 4, 2013

You can just unplug it if it' causing an issue. It's the small dual wire plug down by the pedestal with the little metal retaining clip on it. It'll stay open if this is unplugged.

CSIPSD · Jan 4, 2013

Halvy85 said:
:whs: they have a bad problem with sticking closed. I deleted mine on my 00 as well.

No... They dont.

The valve doesnt stick, the computer keeps them closed because your EBP sensor is plugged.

dirtflinger92 · Jan 4, 2013

It sound like its doing its job..

CSIPSD · Jan 4, 2013

dirtflinger92 said:
It sound like its doing its job..

Exactly... Helps warm a cold motor...

Of course everyone deletes them to pick up .001hp...

Halvy85 · Jan 4, 2013

CSIPSD said:
No... They dont.

The valve doesnt stick, the computer keeps them closed because your EBP sensor is plugged.

Ya that is probably the case with most but even with mine outa the truck and sitting on the bench the butterfly valve didnt function properly. It was stiff moving it by hand and if I pushed it closed it would stick there pretty hard.

CSIPSD · Jan 4, 2013

I've worked on hundreds and seen two that were carboned up... Its not a rash or major issue...

ryanss22 · Jan 4, 2013

As long as it goes away after the motot warms up all is fine, it helps to warm up a cold motor

Strokin'99 · Jan 4, 2013

Yep just the ebv. Makes some interesting noises when it decides to keep kicking in at part throttle going down a sidestreet early in the morning lol

7.3Diesel · Jan 5, 2013

Sounds good, Thanks guys. Something i've wondered.

7.3Diesel · Jan 5, 2013

Strokin'99 said:
Yep just the ebv. Makes some interesting noises when it decides to keep kicking in at part throttle going down a sidestreet early in the morning lol

Same here. When I drive it to school sometimes, its wierd driving past cars on the sidestreet.

Bobby@cp · Jan 5, 2013

Mine as stayed closed a couple of times, but then again it was 10*, hit the skinny peddle and nothing was happening.

I wont delete it till it causes more problems.

Ron's Power Stroke · Jan 6, 2013

IMO un hook it and drive it to warm her up.... none of the IH trucks have a warm up valve...on my SD i didnt see any faster warm ups with it..then again, as soon as the temp gauge moves i put it in drive and go..