Odd Occurance

[Acer2428]

Perhaps the winky face wasn't enough. That would be sarcasm.

[85_305]

It's the internet. Sarcasm isn't quite as it seems 'round these parts

[Acer2428]

Well, you guys had me feeling alright, but I have to double check something with you.

Yesterday, I went to go get some lunch from work. Truck was plugged in. Started it up, maybe 50* outside... Not frigid by any means. Hissing noise. Kept on the entire 2 mile round-trip.

Last night. Truck not plugged in. Go to leave work. This is the series of events:

6:12 - Start Truck (pronounced hissing... Here we go)
6:17 - Flip to high idle (Mother Mary! Sounds like standing behind a 747)
6:22 - Leave parking lot... still hissing/no power
6:27 - Trying to get out onto the main road. NO POWER. CANNOT go above 35mph... Truck bucks when trying to add more than the tiniest bit of throttle, EGT's climb to over 1,000. Pull off on side road. (Still hissing when throttle applied)... Scarring the crap outta me again
6:28 Driving about 10 mph on the side road... Flipped heat on... Still no power, still hissing.
6:29 - Turned heat OFF, instantly, hissing quits, motor quiets, power returns.

I've had this truck since last March and have started it up on business trips, unplugged, when it was MUCH colder than this, and I have NEVER had this problem. Nothing that sounded anything like this or acted like this. It was 35* this morning... Not plugged in... Started fine... No hissing, ever. Why would it do this at 50* plugged in and not 35* unplugged?

Seems to me there is something seriously wrong here.

[daveyburt]

maybe try unplugging the EBPV wire on the turbo pedestal to see if that cures it temporarily.

It sounds like your EBPV is misbehaving.

[Acer2428]

I've spent my morning scowering the web for pictures of the plug. All I know right now is it's a 2-prong plug between the turbo and valve cover under one of the intake tubes.

... My Boss must love me.

[85_305]

I'm positive its the ebpv. I had the same "problem" and made a thread about it. I'd be cruising about 60mph, and out of NOWHERE, it got a LOUD hissing. If I let off or gave it throttle it would go away.

It's the ebpv.

[daveyburt]

LOL - so i'm not the only one spending good work time on the ORG?


Someone posted a pic of it recently here but I can't find it for the life of me.

i think it's the only plug on the pedestal but, could be wrong. I believe it's on the front side of the pedestal, brown plug. I'm assuming that there's a sensor under that plug which may be causing your grief.

[daveyburt]

this may help but i can't see the pics (my work blocks images thru this site)

Ebpv plug location pic wann make sure its the right one

[nccatfan]

EBV tube and/or sensor plugged? Tube is tapped into the front of the pass. side exh. manifold... leads up to a dead-end at the sensor.

[Hoytster]

Either the EBPV is sticking or it is being told to stay open by the ECM because of an incorrect input. The EBPV only kicks in when you are off the throttle or very very slightly into it. Once you press on that pedal for some more power, the EBPV should open and allow full flow.

#1 - Uplug the EBPV connector and see if you still have the problem, if it doesn't do it, then you know it's the EBPV acting up
#2 - Pug the EBPV back in, wait for the truck to start acting up, unplug the EBPV and see if the sympton goes away. If the problem is stil there, the EBPV is sticking
#3 - If unplugging the EBPV takes care of your problem while the truck is acting up, you might want to check your exhaust back pressue sensor and tube. The tube that runs from the exhaust manifold to the sensor can get clogged and cause incorrect readings. This can cause low power and EBPV malfunction. If the tube is clear, then you might have a bad sensor.