boost, What Boost?
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Junior User
Joined: Mar 2007
Posts: 60
Likes: 0
boost, What Boost?
Hey everyone,
My 99 psd has a loud hissing sound that comes and goes while driving. I know that for cold weather start up, the backpressure sensor forces air back into the motor, hence creating a loud hissing sound. However, my truck has been doing it while driving. I have replaced the EBV sensor and have cleaned the tube. I let the truck warm up and i drive down the street and the loud hiss returns. THe hiss is clearly the wastegate opening up. i have also inspected the turbo housin and wheel. There seems to be no problems. I have been driving the truck dead cold lately and the hissing hasn't come on as often. Thinking of installing an EBV bypass sensor. Anyone ever experience this problem? Its killing my mpgs. Any help or suggestions will be greatly appreciated.....Only mods to truck are intake and exhaust
My 99 psd has a loud hissing sound that comes and goes while driving. I know that for cold weather start up, the backpressure sensor forces air back into the motor, hence creating a loud hissing sound. However, my truck has been doing it while driving. I have replaced the EBV sensor and have cleaned the tube. I let the truck warm up and i drive down the street and the loud hiss returns. THe hiss is clearly the wastegate opening up. i have also inspected the turbo housin and wheel. There seems to be no problems. I have been driving the truck dead cold lately and the hissing hasn't come on as often. Thinking of installing an EBV bypass sensor. Anyone ever experience this problem? Its killing my mpgs. Any help or suggestions will be greatly appreciated.....Only mods to truck are intake and exhaust
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
<TABLE><TBODY><TR><TD vAlign=top width="100%">you can unplug the EBPV by un pluging it just under the turbo..above the blue dot in this pic below..there is a wire locking clip on the plug..flip it back and pull on the plug..you will not get a SES light...but you will get a code stored in the PCM...there is a eliminator for this plug if you want it... it plugs into the harness end..
http://www.puredieselpower.com/catalog/9903-73l-powerstroke-exhaust-backpressure-valve-terminator-p-106.html
my EBPV is a exhaust brake only...i never use it for warm ups any more... the EBPS is also used for fueling with the PCM..dont delete that and cleaning the tube is a good thing...the EBPV is the end of a cold start loop..so just unpluging it wont hurt any thing...
<TABLE cellPadding=5 width="80%" align=center><TBODY><TR><TD colSpan=3>
</TD></TR><TR><TD colSpan=3>
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</TD></TR></TBODY></TABLE>
http://www.puredieselpower.com/catalog/9903-73l-powerstroke-exhaust-backpressure-valve-terminator-p-106.html
my EBPV is a exhaust brake only...i never use it for warm ups any more... the EBPS is also used for fueling with the PCM..dont delete that and cleaning the tube is a good thing...the EBPV is the end of a cold start loop..so just unpluging it wont hurt any thing...
<TABLE cellPadding=5 width="80%" align=center><TBODY><TR><TD colSpan=3>
</TD></TR><TR><TD colSpan=3>
</TD></TR></TBODY></TABLE>
</TD></TR></TBODY></TABLE>
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
disables the exhaust back pressure valve from closing on cold starts..i have a 5" staight pipe exhaust...sounds like a jet taking off when the EBPV is closed and high idle kicks in....its job is to hold back pressure making the motor work harder and warm up faster..
Senior User
Joined: Sep 2007
Posts: 271
Likes: 1
From: Roberta, GA
I wandered about that, my truck seems to be developing that noise, they described earlier, might be the clamps though, I will have to check. I have a straight flow 4" all the way back. The noise goes away when I throttle up, comes back when I leave off the pedal. Turbo sounds great! Any ideas?
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
Originally Posted by quality1construction
I wandered about that, my truck seems to be developing that noise, they described earlier, might be the clamps though, I will have to check. I have a straight flow 4" all the way back. The noise goes away when I throttle up, comes back when I leave off the pedal. Turbo sounds great! Any ideas?
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Senior User
Joined: Sep 2007
Posts: 271
Likes: 1
From: Roberta, GA
Yeh, I put about 200 miles on the other day and it didn't seem to make the noise once warned up.
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