any ideas?
Post Fiend
Joined: Sep 2006
Posts: 5,584
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From: Millbrook Alabama
It also may be as simple as the rubber line from the intake manifold to the MAP sensor is cracked and leaking. replace with 1/4 fuel hose.
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New User
Joined: Dec 2006
Posts: 19
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my guage is in the map sensor line. there is also a boost fooler in that line that looks like a air compressor regulator.the line is in good shape i just clamped it all together, who ever put it in there just had it pushed it in the line with no clamps. thanks for all u guys trying to help me figure this out.
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New User
Joined: Dec 2006
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today its like 10 degrees here and my truck made this noise under the hood that sounded like a open air hose untill it got to operating temp or i got above 1500 rpm. what was that. i know it hisses out the exhaust when its cold but ive never heard that under the hood before
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
today its like 10 degrees here and my truck made this noise under the hood that sounded like a open air hose untill it got to operating temp or i got above 1500 rpm. what was that. i know it hisses out the exhaust when its cold but ive never heard that under the hood before
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New User
Joined: Dec 2006
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so when that valve is closed it puts more pressure on a leak thats why i hear it untill it gets warm and opens the epvb valve is that correct.
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
Yes, the EBPV (exhaust back pressure valve) closes off the exhaust flow to aid in warming the engine. By closing the valve, it also will cause back pressure. Don't think the intake pressure will be raised, but the exhaust pressure will. May be hearing your up pipe more when the valve is closed.
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New User
Joined: Dec 2006
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i just replaced the drivers side up pipe gasket with a new ford donut gasket last weekend, but i noticed the pass side is getting a little black around the flange. maybe thats what im hearing then. although i never heard it until i replaced the drivers side. maybe the new one is leaking
Senior User
Joined: Nov 2008
Posts: 323
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From: Socal.......Kinda
I hope it works out. Let us know what ends up being the fix. Good luck Brother.
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