hissing from motor
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New User
Joined: May 2004
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hissing from motor
When I am driving and the turbo isn't boosting, I am getting a hissing from the motor area. It doesn't do it while idling, just when driving under 40mph. Just started within last couple of days. Thought it was exhaust leaking, but I can't seem to find a leak. Sounds like its coming from engine compartment.
Fleet Mechanic
Joined: Jul 2005
Posts: 1,800
Likes: 52
From: Southern Colorado
Do you have a boost gauge? You could be having 'some' boost (under this driving condition) and possibly a boost leak. If you're not familiar with the drill, search on 'boost leak detector' and build one and do the test.
I'm not sure if anyone has ever heard a boost leak over the clatter of the engine, however.
I'm not sure if anyone has ever heard a boost leak over the clatter of the engine, however.
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
Cargo Master
Joined: Apr 2007
Posts: 2,333
Likes: 1
From: St. Louis, Mo.
If you tap the brake or the gas the ebpv should drop out & the hiss should stop. Sounds more like a leak somewhere
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Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
My '99 never applies the EBPV while driving...it only works when the engine is at idle. My friend's Excursion will come on even while driving around the neighborhood so there must be at least two different programs out there....maybe more.
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Post Fiend
Joined: Feb 2002
Posts: 10,600
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From: Carhenge
Understand they been having a bit of cool weather up there for the last few days.
I think you hit the nail on the head.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Yeah I was surprised to learn about that myself.
I will try and attach page 4 from the 1999.9 update technical papers that talks about the function. It explains when the vehicle is in a steady state or the EBP decreases then the regulator can and will activate the valve even while going down the highway as long as engine oil temperature is low.
I will try and attach page 4 from the 1999.9 update technical papers that talks about the function. It explains when the vehicle is in a steady state or the EBP decreases then the regulator can and will activate the valve even while going down the highway as long as engine oil temperature is low.
Posting Guru
Joined: Jun 2009
Posts: 1,443
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From: Bastrop, Texas (Austin,TX
I had the same thing happen today. Had a friend keep the idle at around 2500 and stuck my hand around the connection between the turbo and the intake manifold. That's where I found my leak
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Yeah I was surprised to learn about that myself.
I will try and attach page 4 from the 1999.9 update technical papers that talks about the function. It explains when the vehicle is in a steady state or the EBP decreases then the regulator can and will activate the valve even while going down the highway as long as engine oil temperature is low.
I will try and attach page 4 from the 1999.9 update technical papers that talks about the function. It explains when the vehicle is in a steady state or the EBP decreases then the regulator can and will activate the valve even while going down the highway as long as engine oil temperature is low.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
If you read the description in the 1999 PC/ED manual and compare it to the description in the 2003 manual it will be worded differently. At least I think they were different...I'll have to pull out the books and check again to be sure.