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Old 04-21-2007, 07:43 AM
Nuckin' Futz


 

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Back pressure PSI

heres one for all the techs...because i can't find it in any of my sources...what should the Backpressure sensor reading be in PSI at idle...i can only find the torque spec for the sensor it self. My truck is reading 16 Psi of backpressure and more importantly its reading 13-15 when the truck isn't even running...so im wondering if that isn't another part of my problem
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Old 04-21-2007, 07:30 PM
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Yeah sounds like you need to order a new gauge or try hooking someone elses and see if theirs works on yours??
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Old 04-21-2007, 08:31 PM
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oh, well im going off of my scan tool for the Exhaust Backpressure sensor output...it is saying that even when the truck is off i have 16 psi of backpressure...the EBPV is deactivated and i know its open so i don't think that it is that causeing it but i wonder if i have to clean that tube out that runs from the sensor down to the manifold...ive read that those get plugged up and that every now and then you need to clean them out.
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Old 04-22-2007, 07:27 AM
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Yeah, Check you computers for dirt, and other grime. Our shop has had several diesels that have been out for a day of mudding or just long wear, and they say that their lights, gauges, and cruise control come on and off or surge. Open the hood to fine that the computer module is sprayed with dirt or water. Disconnect them and if you have a compressor like at our shop, (most do) lol, just take the blow gun and spray them out. See if that help? If not jeez could be a world of hurt? I dunno, Were are the techs?
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Old 04-22-2007, 07:39 AM
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These aren't the kind of posts I like reading from you Turbodude. Sux your truck isn't running right for you. I'm not sure what the problem could be with this issue? I don't understand how it could be reading backpressure when off. Something is haywire maybe its an electrical gremlin. Good luck with it man hope you get it figured out.
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Old 04-22-2007, 07:40 AM
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Yeah this isnt supposed to be, Ecspecially when its off WTF?
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Old 04-22-2007, 07:43 AM
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16 at idle is fine....and the reason its reading 13-14 witht the motor off is then its reading atmospheric pressure....thats normal.....id expect 16-20 or so at idle...with it peaking maybe as high as 35 at WOT.....
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Old 04-23-2007, 04:24 PM
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well the baro and map both read 12.9 psi when it is off which i think is right for this altitude so i dont understand why its reading that. like i put in my other post...ive admitted defeat and its going into the shop...the work schedule wont let me tinker with it anymore...hopefully they can figure it out and hopefully its not an internal problem...it started doing this the day that i picked it up from getting injector number six replaced so mabe they forgot to tighten something down or mabe its another injector i don't know...Im too aggrovated to work on it anymore ill probably just break it all to pieces if i mess with it anylonger...so ill let them mess with it and give me the bad news.
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