Exhaust backpressure sensor?
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Cargo Master
Joined: May 2011
Posts: 2,623
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From: Rockford IL
Exhaust backpressure sensor?
Hey I just registered because Ive read plenty off this forum thats been helpful...so why not be apart of it!
Anyway, I just bought my "new" truck.. 97 f350 7.3 PSD and it starts up really nice, but a few seconds after starting it has this hissing sound... it usually only lasts a few seconds.. and if the trucks already been warmed up it doesnt do it.
Ive glanced at the "white smoke" and gpr and stuff thread, but I didnt see anything posted there about this hissing sound, but my truck does white smoke rough start in the early morning when its in the 30s or 40s, but I dont know if this is related. One of my diesel friends said his uncle had a problem like that and it was the Exhaust Backpressure sensor? Like the valve for the exhaust is getting stuck or something.
Im not entirely sure...and I dont like just replacing things that arent broke, but i want my truck runnin as good as she can.
advice? thanks in advance
Anyway, I just bought my "new" truck.. 97 f350 7.3 PSD and it starts up really nice, but a few seconds after starting it has this hissing sound... it usually only lasts a few seconds.. and if the trucks already been warmed up it doesnt do it.
Ive glanced at the "white smoke" and gpr and stuff thread, but I didnt see anything posted there about this hissing sound, but my truck does white smoke rough start in the early morning when its in the 30s or 40s, but I dont know if this is related. One of my diesel friends said his uncle had a problem like that and it was the Exhaust Backpressure sensor? Like the valve for the exhaust is getting stuck or something.
Im not entirely sure...and I dont like just replacing things that arent broke, but i want my truck runnin as good as she can.
advice? thanks in advance
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
It's normal for the truck to do that. The PCM cycles that valve on initial start up to determine if it is working or not. The PCM monitors a sensor called the EBPS (exhaus back pressure sensor) to ensure it indeed is working. It will continue to do so on start ups until the EOT get up to 130 degrees or above. All is OK, don't worry about it, nothing is broken.
Thread Starter
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Cargo Master
Joined: May 2011
Posts: 2,623
Likes: 0
From: Rockford IL
Ah, Well thats good news. I was just confused since the truck runs great! My friend says his does that for quite some time during the winter and I wanted to make sure all is well before another rough midwest winter comes about us, but if it does it until it reaches a certain temp it makes sense it takes longer in winter. Thanks!
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Yes it will in the winter. The valve closes off part of the exhaust system just after the turbo. This causes a back pressure forcing the engine to work harder and produce high exhaust temps, helping in warm up of the engine and window defrosting. Some like and some don't. When it gets cold, below 30 degrees or so you will feel / hear the same thing as you are driving until the EOT gets up to above 170 degrees.
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