Exhaust Back Pressure
Thread Starter
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
Exhaust Back Pressure
My fuel mileage has dropped significantly recently. I had my codes ran several times before the tranny swap and here's what I got: A torque converter code(no more TC so no more code), some CPS codes(blah blah blah- fixed), and a P0472 which is Exhaust Pressure Sensor Circuit Low Input. Now for the questions.
Is that referring to the exhaust back pressure sensor attached to the HPOP? If so, I cleaned it and the tube as well as possible a couple months ago and still threw the code again. Could a problem with it affect my fuel trim thus decreasing fuel mileage? On page 10 of this link there are some diagnostic things but I don't even know how to translate it. http://www.motorcraftservice.com/vdi.../DOBDSM971.pdf
Is that referring to the exhaust back pressure sensor attached to the HPOP? If so, I cleaned it and the tube as well as possible a couple months ago and still threw the code again. Could a problem with it affect my fuel trim thus decreasing fuel mileage? On page 10 of this link there are some diagnostic things but I don't even know how to translate it. http://www.motorcraftservice.com/vdi.../DOBDSM971.pdf
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
From what I noticed on mine, that is an indication that the EBP sensor tube is blocked.
And I also discovered some spray brake cleaner does an excellent job cutting the soot, then some shop air to blow it clean.
No more code.
And I also discovered some spray brake cleaner does an excellent job cutting the soot, then some shop air to blow it clean.
No more code.
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
Yea, I keep forgetting about that thing you guys are talking about.
I've never had to mess with mine, Knock on wood.
I've never had to mess with mine, Knock on wood.
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
I've pulled and cleaned mine before. I used brake parts cleaner and weed trimmer line. It seemed to clean it really well but I still had the code afterward.
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Thread Starter
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
It's not terribly hard at all. You can also pull the sensor and do the same with it. If the line is dirty then chances are the sensor is too but be kind of ginger with it because it's not cheap.
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
If you pull off the black plastic cover that is over your fuel bowl, GPR, HPOP, etc you can access it. It is a small metal line that runs from the EBP sensor and snakes between the alternator and HPOP down to the exhaust.
I've pulled and cleaned mine before. I used brake parts cleaner and weed trimmer line. It seemed to clean it really well but I still had the code afterward.
I've pulled and cleaned mine before. I used brake parts cleaner and weed trimmer line. It seemed to clean it really well but I still had the code afterward.
You can buy it in Ford dealer. IIRC Neal has the # part. Ill look for it.
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
Exhaust Back Pressure Sensor<O
</O(Ford) F4TZ-9J460-A (94-96; mounts on bracket above oil reservoir)
(Ford) F7TZ-9J640-AA (97-up; may mount like earlier models, later in front of reservoir)
<O
so I thik that the tube also has different # part, all depends if goes in front or back of the HPOP. The number in the pic if for 97-up (in front), stolen from Neals pics.</O