2002 7.3 turbo problems
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2002 7.3 turbo problems
Guys,
I have a 2002 Excursion with a 7.3L Diesel. A scan of the codes shows two codes. The first is a P0674 - Cyl 4 glow plug circuit. I have recently replaced the Glow plug controller. This one is not my biggest worry.
The other code is P1248 - Turbo Boost Pressure not detected. I was searching posts to try to understand what fixes there are for this, and when driving it yesterday realized I DO NOT hear the whine of the turbo at all.
Since I an new to Diesels and Turbos, but a mechanic for many years, can anyone point me in a direction in plain words as to how to troubleshoot the turbo?
I have read that possible causes of the P0674 could be Map Hose, Sensor, EBP sys, Intake leads, or turbo. I don't know what the EBP sys is.
Can anyone point me in any direction on this. I really don't want to bring it in.
thanks.
I have a 2002 Excursion with a 7.3L Diesel. A scan of the codes shows two codes. The first is a P0674 - Cyl 4 glow plug circuit. I have recently replaced the Glow plug controller. This one is not my biggest worry.
The other code is P1248 - Turbo Boost Pressure not detected. I was searching posts to try to understand what fixes there are for this, and when driving it yesterday realized I DO NOT hear the whine of the turbo at all.
Since I an new to Diesels and Turbos, but a mechanic for many years, can anyone point me in a direction in plain words as to how to troubleshoot the turbo?
I have read that possible causes of the P0674 could be Map Hose, Sensor, EBP sys, Intake leads, or turbo. I don't know what the EBP sys is.
Can anyone point me in any direction on this. I really don't want to bring it in.
thanks.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by pacampora
Guys,
I have a 2002 Excursion with a 7.3L Diesel. A scan of the codes shows two codes. The first is a P0674 - Cyl 4 glow plug circuit. I have recently replaced the Glow plug controller. This one is not my biggest worry.
The other code is P1248 - Turbo Boost Pressure not detected. I was searching posts to try to understand what fixes there are for this, and when driving it yesterday realized I DO NOT hear the whine of the turbo at all.
Since I an new to Diesels and Turbos, but a mechanic for many years, can anyone point me in a direction in plain words as to how to troubleshoot the turbo?
I have read that possible causes of the P0674 could be Map Hose, Sensor, EBP sys, Intake leads, or turbo. I don't know what the EBP sys is.
Can anyone point me in any direction on this. I really don't want to bring it in.
thanks.
I have a 2002 Excursion with a 7.3L Diesel. A scan of the codes shows two codes. The first is a P0674 - Cyl 4 glow plug circuit. I have recently replaced the Glow plug controller. This one is not my biggest worry.
The other code is P1248 - Turbo Boost Pressure not detected. I was searching posts to try to understand what fixes there are for this, and when driving it yesterday realized I DO NOT hear the whine of the turbo at all.
Since I an new to Diesels and Turbos, but a mechanic for many years, can anyone point me in a direction in plain words as to how to troubleshoot the turbo?
I have read that possible causes of the P0674 could be Map Hose, Sensor, EBP sys, Intake leads, or turbo. I don't know what the EBP sys is.
Can anyone point me in any direction on this. I really don't want to bring it in.
thanks.
For the most part the MAP hose/tubing leak is what needs to be checked. I would also check the electrical connection on the MAP sensor. Do you have a boost gauge and if so has it changed too?
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Ok. I did remove the intake boot, and the turbo spins freely. Then I started up the engine, and it did spin. took it for another ride, with the tube back on, and still no sound of the turbo. Yes, I definately used to hear it. My wife drives it daily, so I don't know ehen it stopped. She didn't even notice the sound difference. But it definately has no ***** up a hill.
Originally the Engine light came on. ran codes, and replaced the CPS. light stayed off for about two weeks. Ran better. then the light came on again. having trouble starting cold at this point. Changed the GPC. Started fine and the light off again for another couple of weeks. Then the light come on again, and foung the P0674 and P1248 codes. At that time I noticed the lack of power and no turbo sound. I don't have a boost guage.
Originally the Engine light came on. ran codes, and replaced the CPS. light stayed off for about two weeks. Ran better. then the light came on again. having trouble starting cold at this point. Changed the GPC. Started fine and the light off again for another couple of weeks. Then the light come on again, and foung the P0674 and P1248 codes. At that time I noticed the lack of power and no turbo sound. I don't have a boost guage.
Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
First thing I would do is check all your boots from the turbo to the IC back to the engine check the clamps and look for cracks in the hoses. Or you can make a pressure tester like this one that cookie88 made,remove the intake hose at the turbo hook this directly to the turbo inlet and presserize with air set your regulator between 15-20 psi and start looking for leaks . Clear your codes if you haven't done that yet and see about hooking up a boost gauge so we can see what your boost # s are. 
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Thanks, I will look into hooking up a boost gauge. I'm sure there are other posts on how to hook it up. The pressure tester looks pretty simple too. A quick trip to home depot. I'll check for obvious leaks first.
PSD Addict
Joined: Nov 2006
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From: Michigan
For my pressure testor I was able to just get a 3" PVC end cap, it was 4" OD so it worked perfectly and was 1 piece.
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Posting Guru
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From: Jonestown PA
pacampora are you from PA since its in your user name, and where at?
Does this happen when its cold or up to normal operating temps? Your (EBPS) exhaust backpressure sensor could be cloged and keeping your EBPS closed and not sensing the backpressure to reopen it. Then you wont hear the turbo and it would "have no *****". But I could be wrong.
Does this happen when its cold or up to normal operating temps? Your (EBPS) exhaust backpressure sensor could be cloged and keeping your EBPS closed and not sensing the backpressure to reopen it. Then you wont hear the turbo and it would "have no *****". But I could be wrong.
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No, the filter is about 8 months old. 1st I banged out the dirt in an effort to see a difference. No difference... Note - the filter was not really dirty. Second I removed the filter completely and saw no difference.
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OK, It's all better now. I didn't have to do the pressure test. I found an exhaust leak.
The leak was where the drivers exhaust manifold bolts to the pipe. Both bolts were loose. I tightened them up last night, and spent all day today changing ball joints. Now that was a job... Not fun.
Anyway, when I took it for a test drive after the ball joints were in, I heard the turbo kick in. The truck finally runs the way it used to. What a difference.
Redfire42 got me thinking about the EBP, which led me to check all the exhaust connections.
Redfire42, No I'm from Conecticut.
Thanks to everyone who helped me with this one!!!!!
The leak was where the drivers exhaust manifold bolts to the pipe. Both bolts were loose. I tightened them up last night, and spent all day today changing ball joints. Now that was a job... Not fun.
Anyway, when I took it for a test drive after the ball joints were in, I heard the turbo kick in. The truck finally runs the way it used to. What a difference.
Redfire42 got me thinking about the EBP, which led me to check all the exhaust connections.
Redfire42, No I'm from Conecticut.
Thanks to everyone who helped me with this one!!!!!
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
Congrats! I'm surprised that you weren't getting any boost at all, though. You'd think that a leak that bad would A) be very loud, and B) you'd have no power with lots of smoke...
I got that code when I forgot to plug the MAP sensor cable back in after installing the Overboost Annihilator.
Glad it's fixed!
I got that code when I forgot to plug the MAP sensor cable back in after installing the Overboost Annihilator.
Glad it's fixed!
Freshman User
Joined: Oct 2007
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From: East Tennessee
Originally Posted by pacampora
OK, It's all better now. I didn't have to do the pressure test. I found an exhaust leak.
The leak was where the drivers exhaust manifold bolts to the pipe. Both bolts were loose. I tightened them up last night, and spent all day today changing ball joints. Now that was a job... Not fun.
Anyway, when I took it for a test drive after the ball joints were in, I heard the turbo kick in. The truck finally runs the way it used to. What a difference.
Redfire42 got me thinking about the EBP, which led me to check all the exhaust connections.
Redfire42, No I'm from Conecticut.
Thanks to everyone who helped me with this one!!!!!
The leak was where the drivers exhaust manifold bolts to the pipe. Both bolts were loose. I tightened them up last night, and spent all day today changing ball joints. Now that was a job... Not fun.
Anyway, when I took it for a test drive after the ball joints were in, I heard the turbo kick in. The truck finally runs the way it used to. What a difference.
Redfire42 got me thinking about the EBP, which led me to check all the exhaust connections.
Redfire42, No I'm from Conecticut.
Thanks to everyone who helped me with this one!!!!!
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I knew the leak was there, but it only made noise when the truck was first started. As it warmed up, the leak went away. So I didn't bother with it because of the cold weather. Was going to wait for the warm weather to fix it.
And there was definately no smoke.
Thanks again.
And there was definately no smoke.
Thanks again.