Hissing on Shutoff
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
No.
What you hear is a volume that has either accumulated vacuum or pressure,
It's bleeding off.
An EGR could do this if the EVR is not letting air back into the diaphram in the normal manner during operation.
If the EGR is kept open with vaccuum all the time you will have drivability issues.
What you hear may be something else; the EGR is one example.
What you hear is a volume that has either accumulated vacuum or pressure,
It's bleeding off.
An EGR could do this if the EVR is not letting air back into the diaphram in the normal manner during operation.
If the EGR is kept open with vaccuum all the time you will have drivability issues.
What you hear may be something else; the EGR is one example.
Senior Member
Joined: Jan 2000
Posts: 3,205
Likes: 3
From: Along Lake Erie
Originally Posted by Bluegrass
No.
What you hear is a volume that has either accumulated vacuum or pressure,
It's bleeding off.
An EGR could do this if the EVR is not letting air back into the diaphram in the normal manner during operation.
If the EGR is kept open with vaccuum all the time you will have drivability issues.
What you hear may be something else; the EGR is one example.
What you hear is a volume that has either accumulated vacuum or pressure,
It's bleeding off.
An EGR could do this if the EVR is not letting air back into the diaphram in the normal manner during operation.
If the EGR is kept open with vaccuum all the time you will have drivability issues.
What you hear may be something else; the EGR is one example.
-Joe
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
My cat shields ting allot after shut down, but thats normal. I have a 98 and theres been a few cat shields TSB's from Ford. The noisiest costumer concern to do with the cat shields is that they get loose, but most of the noise is generated at idle in gear with the brakes applied.
The #1 noise after shut down is what Bluegrass touched on I think - The EGR Vacuum Regulator Solenoid (EVR). On the 5.4L - 4.6L engines is sits directly between the TPS and DPFE sensors. After shutdown it can hum/whine , play a toon. If you here something of that sort , Immediately open your hood and put your hand on it to verify concern - it will be vibrating..That's not the problem tho - Your EGR valves diaphram is plugged..
The #1 noise after shut down is what Bluegrass touched on I think - The EGR Vacuum Regulator Solenoid (EVR). On the 5.4L - 4.6L engines is sits directly between the TPS and DPFE sensors. After shutdown it can hum/whine , play a toon. If you here something of that sort , Immediately open your hood and put your hand on it to verify concern - it will be vibrating..That's not the problem tho - Your EGR valves diaphram is plugged..
Last edited by jbrew; Feb 24, 2007 at 05:16 AM.
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Joined: Nov 2006
Posts: 5,495
Likes: 7
From: Memphis, TN 38135, USA, Earth
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Joined: Jul 2006
Posts: 174
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Originally Posted by jbrew
My cat shields ting allot after shut down, but thats normal. I have a 98 and theres been a few cat shields TSB's from Ford. The noisiest costumer concern to do with the cat shields is that they get loose, but most of the noise is generated at idle in gear with the brakes applied.
The #1 noise after shut down is what Bluegrass touched on I think - The EGR Vacuum Regulator Solenoid (EVR). On the 5.4L - 4.6L engines is sits directly between the TPS and DPFE sensors. After shutdown it can hum/whine , play a toon. If you here something of that sort , Immediately open your hood and put your hand on it to verify concern - it will be vibrating..That's not the problem tho - Your EGR valves diaphram is plugged..
The #1 noise after shut down is what Bluegrass touched on I think - The EGR Vacuum Regulator Solenoid (EVR). On the 5.4L - 4.6L engines is sits directly between the TPS and DPFE sensors. After shutdown it can hum/whine , play a toon. If you here something of that sort , Immediately open your hood and put your hand on it to verify concern - it will be vibrating..That's not the problem tho - Your EGR valves diaphram is plugged..
Last edited by iziris; Feb 24, 2007 at 12:36 PM.
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
Originally Posted by iziris
i notice this noise when i shut my truck off and the other day i had opened my hood and noticed it was coming from the EVR. from what you are saying the egr valves are plugged? what is the solution? i just recently replaced my egr valve about 2k miles ago.
Do U still have the old one? Try plugging that in and see what happends . It could be the orifice..