Can a bad Exhaust Back Pressure sensor cause no boost and there fore no power?
Post Fiend
Joined: Jun 2006
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From: Central, Al
Heres the sensor
The tube runs from under it to the front of the passenger side exhaust manifold.
A crowfoot wrench makes it a little easier to get the upper nut off. Once removed from the truck spray with Brakleen or similar stuff. A 3' piece of 0.95 square weedeater line works good as a snake to run throung to pipe. Repeat spraying and reaming with the weedeater line about 4 times and it usually gets it pretty good. Before reinstalling pressurize the tube to check for any small cracks.
The tube runs from under it to the front of the passenger side exhaust manifold.
A crowfoot wrench makes it a little easier to get the upper nut off. Once removed from the truck spray with Brakleen or similar stuff. A 3' piece of 0.95 square weedeater line works good as a snake to run throung to pipe. Repeat spraying and reaming with the weedeater line about 4 times and it usually gets it pretty good. Before reinstalling pressurize the tube to check for any small cracks.
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
Now for part 2
The PCM is allowed to controll the EBPV up to an oil temp of 167*F when ambients are < 45*F. When the Temp needle on the dash goes to the normal position the oil temp is only around 130*F (as seen in AE) so it will continue to close under low speed (< ~45mph) low load conditions for a bit longer. A clogged/cracked tube will usually show a low backpressure and effect mileage and cause the PCM to interpret a Low Load condition even when heavy into the pedal. A bad sensor will cause the PCM to use a default value based on pedal position.
The PCM is allowed to controll the EBPV up to an oil temp of 167*F when ambients are < 45*F. When the Temp needle on the dash goes to the normal position the oil temp is only around 130*F (as seen in AE) so it will continue to close under low speed (< ~45mph) low load conditions for a bit longer. A clogged/cracked tube will usually show a low backpressure and effect mileage and cause the PCM to interpret a Low Load condition even when heavy into the pedal. A bad sensor will cause the PCM to use a default value based on pedal position.
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Post Fiend
Joined: Jun 2006
Posts: 5,497
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From: Central, Al
Theres a used one on ebay for $1.99 But i would try http://www.puredieselpower.com/catal...ebp-p-718.html
Post Fiend
Joined: Jun 2006
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From: White Mnt's,New Hampshire
[QUOTE=amiller93]Theres a used one on ebay for $1.99 But i would try http://www.puredieselpower.com/catalog/9703-ford-73l-powerstroke-exhaust-backpressure-sensor-ebp-p-718.html[/QUOTE]
thats a good price...i was close though..120 at dealer it said..
thats a good price...i was close though..120 at dealer it said..
Post Fiend
Joined: Jun 2006
Posts: 9,714
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From: White Mnt's,New Hampshire
alan i have a Eliminator in place of my EBPS..my EBPV is a exhaust brake now and it does not get used on the cold start package..unless i turn it on my self...whats your thoughts on that good or bad??? thanks
Post Fiend
Joined: Jun 2006
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From: Central, Al
Ron the PCM wont controll yours so there is no problem, the PCM is seeing an average backpressure reading from the Eliminator. Only reason i dont hook it up as a brake is the 01 tranny dont want to have to see brian before I want to.
Post Fiend
Joined: Jun 2006
Posts: 9,714
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From: White Mnt's,New Hampshire
Originally Posted by amiller93
Ron the PCM wont controll yours so there is no problem, the PCM is seeing an average backpressure reading from the Eliminator. Only reason i dont hook it up as a brake is the 01 tranny dont want to have to see brian before I want to.