Locating and Replacing a Exhaust Backpressure sensor
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Junior User
Joined: Mar 2007
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Locating and Replacing a Exhaust Backpressure sensor
Hello,
Recently my 1999 F250 SD 7.3 TD has been acting up. I have researched and narrowed the problem down to the exhaust backpressure sensor. There is a sensor directly under the turbo and there is a sensor directly in front of the motor. I think the EBPS is the sensor in the front of the motor with a tube extending from the bottom of it. My concern is removing the old sensor and replacing it with a new one? I believe that I may have found the part at this location:
http://www.powerstrokegogo.com/index...D=82&offset=45
(About half way down the page)
If any one has replaced this sensor, I would like some feedback on the difficulty of the job. Also, how do you remove the old sensor?
Any advice is greatly appreciated...Thanks
Recently my 1999 F250 SD 7.3 TD has been acting up. I have researched and narrowed the problem down to the exhaust backpressure sensor. There is a sensor directly under the turbo and there is a sensor directly in front of the motor. I think the EBPS is the sensor in the front of the motor with a tube extending from the bottom of it. My concern is removing the old sensor and replacing it with a new one? I believe that I may have found the part at this location:
http://www.powerstrokegogo.com/index...D=82&offset=45
(About half way down the page)
If any one has replaced this sensor, I would like some feedback on the difficulty of the job. Also, how do you remove the old sensor?
Any advice is greatly appreciated...Thanks
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Its quite common around here. Yes it's the front one behind the belt just above the water pump. You will need a 1" long socket, a 5/8" wrench and a 9/16" wrench. Disconnect the top of the sensor, and stick the long socket down on the sensor. Attempt to remove it, it might budge easily or it might not budge and begin to bend the sensor. Use one of the wrenches (one WILL work) and hold the bracket. I believe it's the smaller one. Once you remove the sensor, look down into the hole. chances are you won't be able to see through it. Remove that end from the bracket, using the 5/8" wrench. Then remove the other end from the manifold, clean the pipe out using weedeater cable and a drill, brake kleen helps. Reassemble and watch your mileage go up. 
Post Fiend
Joined: Jun 2006
Posts: 5,497
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From: Central, Al
Yep thats it. As far as removing it just spray it with a bit of wd40 or other penetrating oil and use a deep well ratchet. Be careful not to apply any lateral force when installing the new one so you dont break it.
It is in front of the motor with a tube extending below it to the passenger side manifold.
It is in front of the motor with a tube extending below it to the passenger side manifold.
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
I got mine on ebay, Ford factory part in the original bag.. You are correct. It is the sensor up front.. Remove it with 1" deep socket. Also, you should remove the clean the tubing extending to the exhaust manifold.. Some people try and clean without removing it but i find it better just to remove it completely. You might have apply some penatrating oil to the fitting (at the exhaust manifold). Good luck..
Laughing Gas
Joined: Jul 2003
Posts: 1,157
Likes: 1
From: Littleton, Colorado
I agree with removing it too. While you're in there replacing the sensor do the the job right and be done with it. My take on it, as with most things in life is that being thorough pays 9 out of 10 times. Good odds.
Put a little high temp anti sieze on the manifold side threads and the next time will be smooth and easy too.
Austin
Put a little high temp anti sieze on the manifold side threads and the next time will be smooth and easy too.
Austin
Senior User
Joined: Dec 2003
Posts: 170
Likes: 0
From: Union Grove, Wisconsin
I just performed this cleaning on mine. It was completely plugged. As the others have already stated, be ready to spray lots of penetrating oil on the fittings. Mine were really tough to get loosened. I had to spray each one 3 times before I could break them loose. Pay attention to which way the tube comes off so you don't try to put in back on backwards. Don't ask me how I know this. 
I went and purchased .095" weedeater line and hooked it into my cordless drill. That worked real well. I kept spraying brake cleaner in the tube at the same time.
I went and purchased .095" weedeater line and hooked it into my cordless drill. That worked real well. I kept spraying brake cleaner in the tube at the same time.
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Junior User
Joined: Mar 2007
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Thanks for all of the help. What is the sensor located directly underneth the turbo? Also, I will be careful removing the sensor and tube. The sensor appears to be pretty rust free but the tube looks pretty bad. Does that tube follow down into an area by the passenger side wheel well? Also, if i removed/disconnected that sensor, would i see my problems just disappear? I ask this because the sensor isn't too cheap and I want to make sure that the sensor is the problem. Thanks
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Cargo Master
Joined: Jun 2003
Posts: 3,292
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From: Ardenvoir, Washington
What are the problems you are having? Give us more detail. Have you had the fault codes read..?
The tubing comes from the front end of the pass. side exhaust manifold and heads up towards your sensor..
The tubing comes from the front end of the pass. side exhaust manifold and heads up towards your sensor..
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Junior User
Joined: Mar 2007
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The problems that I am having with the truck are the lose of boost from around 1500rpm to 2000 especially when cold. At those speeds, the truck is also very sluggish and just does want to maintain consistent boost or speed. However, once the truck is fully warmed up, the loss of boost comes and goes. This problem is always felt in the cold whether and comes and goes in the warmer weather. Between 1500 and 2000 rpm there is also a very loud hiss which is coming out from around the wastegate area. Very loud and very annoying. I have also had a lose in gas milege. I believe from my research that it could be either the tube is clogged and/or the sensor itself. If you know of anything else, please let me know. Thanks!!
Post Fiend
Joined: Sep 2006
Posts: 5,584
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From: Millbrook Alabama
What you are experiencing when cold is the EBPV(exhaust by pass valve) kicking in(loud hissing, and engine up idles) this is completley normal. it is a function that has been designed into our engines to facilitate faster warm ups.
The sensor that you are replacing reads the amount of exhaust backpressure, and tells the PCM how much load is on the engine, thus the PCM adjusts the fuel maps to best suit the load. with a clogged up or leaking EBP Tube (from the manifold to the sensor) your PCM is not seeing the true load on the engine, and defaults to a lower fueling map.
First clean Tube and sensor(use a small pick if necessary, but, be careful, cause there ius a diaphragm inside that you do not need to puncture) re install and drive for a test. If you are not getting a code for the EBP sensor then it might not need replacing, just cleaning of the tube.
The sensor that you are replacing reads the amount of exhaust backpressure, and tells the PCM how much load is on the engine, thus the PCM adjusts the fuel maps to best suit the load. with a clogged up or leaking EBP Tube (from the manifold to the sensor) your PCM is not seeing the true load on the engine, and defaults to a lower fueling map.
First clean Tube and sensor(use a small pick if necessary, but, be careful, cause there ius a diaphragm inside that you do not need to puncture) re install and drive for a test. If you are not getting a code for the EBP sensor then it might not need replacing, just cleaning of the tube.