P0470 backpressure sensor circuit error HELP PLEASE
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P0470 backpressure sensor circuit error HELP PLEASE
Hi,
I get this once in a while and it triggers my light....no change in performance at all and sometimes it will go a week without tripping the CEL.
I am wondering if there is any way to check this sensor (I believe it is right by the t/stat housing) or if there is just any opinions on just replacing it. Not sure what would cause this so I turn to you guys for help....as always thank you for the help
Joe
I get this once in a while and it triggers my light....no change in performance at all and sometimes it will go a week without tripping the CEL.
I am wondering if there is any way to check this sensor (I believe it is right by the t/stat housing) or if there is just any opinions on just replacing it. Not sure what would cause this so I turn to you guys for help....as always thank you for the help
Joe
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If you could kinda dumb it up for me (pis?) that would be cool....I am not sure how to even begin to check what you are talking about.
Thanks Cheezit
Joe
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From: Woodbridge, Ontario, CA
On a more serious note, what cheezit is referring to, is your MAP (Manifold Absolute Pressure), BARO (Barometric Pressure) and EBP (Exhaust Back Pressure) readings at key-on/engine-off. The readings for the three sensors are in PSI (Pounds Per Square Inch) units. By virtue of the fact that the engine is not running when checking the readings with the key in the RUN position, all three sensors should have equal readings (about 14.3 psi). When the engine is started, MAP and EBP should increase slightly. If EBP is reading let's say 15 to 16 psi, while MAP and BARO are at 14.5, then the EBP sensor needs to replaced. Similarly, if you see MAP and BARO at 14.5 and EBP is at 12 or 13. Are you hearing any turbo fluttering? Usually when EBP readings are off, you'll hear a turbo flutter after you release the throttle when accelerating. To monitor the three data listed, you'll need a scan tool that is capable of reading live data.
Lead Driver
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From: Woodbridge, Ontario, CA
Aaaaahhh yes, I gotcha. You meant to type PID (Parameter Identification Data) not PSI (Pounds Per Square Inch). I had thought you reversed the "i" and the "s" by mistake. Thanks for clearing that up.
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hahaha I figured as much. I bet I know what the problem is.....my quadzilla monitor had me splice a 24 gauge wire into the MAP sensor for a boost reading. I removed that wire today since I installed a mechanical boost that proved what I have been thinking all while long...the quadzilla was wrong. My boost NEVER went above 19psi even tuned....now I am normal ranged since the mechanical install.
Since you guys mentioned the MAP and BARO work together with the EBP sensor, it all kinda makes sense that the extra wire I spliced into the MAP sensor was interrupting the signal.
I will monitor it further....since I dont have a scantool and it continues...I'll just change the EBP sensor.
Cheezit or mchan68....do you guys have a part number for a 2004 (Nov 2003 build) 6.0L engine back pressure sensor?
Thanks for the help
COINCIDENTALLY.....what do you guys think of my idea for the problem in relation to the spliced wire for boost signal?
Since you guys mentioned the MAP and BARO work together with the EBP sensor, it all kinda makes sense that the extra wire I spliced into the MAP sensor was interrupting the signal.
I will monitor it further....since I dont have a scantool and it continues...I'll just change the EBP sensor.
Cheezit or mchan68....do you guys have a part number for a 2004 (Nov 2003 build) 6.0L engine back pressure sensor?
Thanks for the help
COINCIDENTALLY.....what do you guys think of my idea for the problem in relation to the spliced wire for boost signal?
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Lead Driver
Joined: Mar 2010
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From: Woodbridge, Ontario, CA
Are you getting a P0470 by itself or in conjunction with other DTCs? Usually P0470 sets if the PCM doesn't see and EBP reading it likes.
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The only DTC I get is the P0470.....I'll clear it and it comes back under no particular circumstance (ie full throttle, coast, constant RPM etc) . I was wondering Mchan68.....there is a rigid line that screws to the bottom of the EBP....not sure what it is, but can only assume it is a line routed from the exhaust? How does the EBP get its reference reading?
....and am I correct on its location.....right by the thermostat?
....and what exactly does the EBP do?
Thanks
Joe
....and am I correct on its location.....right by the thermostat?
....and what exactly does the EBP do?
Thanks
Joe
Lead Driver
Joined: Mar 2010
Posts: 5,505
Likes: 257
From: Woodbridge, Ontario, CA
The only DTC I get is the P0470.....I'll clear it and it comes back under no particular circumstance (ie full throttle, coast, constant RPM etc) . I was wondering Mchan68.....there is a rigid line that screws to the bottom of the EBP....not sure what it is, but can only assume it is a fuel line? How does the EBP get its reference reading?
....and am I correct on its location.....right by the thermostat?
....and what exactly does the EBP do?
Thanks
Joe
....and am I correct on its location.....right by the thermostat?
....and what exactly does the EBP do?
Thanks
Joe
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Logistics Pro
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You are the man.........thank you buddy....rep points for certain. I will check it soon.
Thanks for the help
Joe
CR*P...it wont let me....I'll get you soon
Thanks for the help
Joe
CR*P...it wont let me....I'll get you soon
Last edited by joe blow; Apr 20, 2011 at 11:26 PM. Reason: rep
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Mchan68,
I have a question for you....If I understand it correctly all of the backpressure is created by the turbo and some from the CAT/Muffler. Since the hollow tube for the EBP sensor references BP from the drive side exhaust manifold, is it possible that my EBP is having issues because I have a straight piped 4" exhaust?
I have a question for you....If I understand it correctly all of the backpressure is created by the turbo and some from the CAT/Muffler. Since the hollow tube for the EBP sensor references BP from the drive side exhaust manifold, is it possible that my EBP is having issues because I have a straight piped 4" exhaust?
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ok....so do you think that by modifying either of the four (as I removed three of the four but had a tune written to remove the EGR strategy) would give me a faulty reading at the EBP and trigger the CEL?