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  Topic Review (Newest First)
08-21-2019 09:27 AM
Metalburner I am glad you found your problem but that won't do me any good, as my truck is straight piped with no cat to pull. I noticed on my datalog that my VGT command is staying at a constant .84 volts. It never changes. My truck will boost some when it starts turning some RPMs but that value never ever changes. I'm still waiting on the PCM to get here Friday and hopefully that will make all the difference. But any other ideas?
08-19-2019 10:37 AM
Metalburner My truck is straight piped. No cat to pull. So any other suggestions...
08-19-2019 06:33 AM
Ryans Rebel
Quote:
Originally Posted by Metalburner View Post
Not trying to highjack your thread but I just experienced the exact same thing in my 06 350. Coming down the road and lost boost pressure. Came back about ten minutes later. Then the next morning was there. Cranked that evening and lost it again. I have just replaced the turbo (268k on it) with new and it's doing the exact same as before. I've done the same things and checked the same stuff. The only difference I've noticed on mine is a P0046 code. I've checked the wires going from the VGT solenoid over to the PCM for continuity and they came up good on both of them. I also tried to check them for continuity to the engine to see if they were grounded out, but came up with nothing. I broke down and ordered a new PCM just to rule it out seeing as I don't have another person close by to switch out with. I'm interested to see what you find, and if I find anything, I'll be sure to post up as well.
I would recommend pulling the cat and checking it out, if you haven't already. See my post above!
08-19-2019 06:27 AM
Ryans Rebel UPDATE: FIXED!!

It was the catalytic converter.

I pulled the down pipe off the turbo and noticed a 1-2 psi boost while revving the engine in park. - that was more than I have seen throughout all my testing. So, I pulled the cat. When I looked inside I knew I had an issue. The entire element had broken free from the ID and was flopping around. You can see in the pics, the element turned 90 degrees and then backed up against the outlet (you can see the round black ring on the element where it was up against the outlet). With the element turned 90 degrees, there could not have been any flow - kind of working like a ball check at this point!

Once cut apart, the element just fell out. Repaired the cat housing and reinstalled.

I'm sure this was my problem all along. However, going through everything (VGT actuator, charge air system, etc) tough me a ton about my truck, not to mention forced me to locate a crack in the plastic CAC pipe, and a badly worn turbo. I'm a happy camper. Thanks to everyone here who helped!

Ryan


P.S. With the type of cat failure I experienced, you can see how this could be intermittent. As long as the element is rolling around you could go from "straight pipe" performance to nothing in an instant.
08-18-2019 10:55 PM
mhatlen
Quote:
Originally Posted by Ryans Rebel View Post
I do hear a very slight (and I mean slight) tone change when I plug in the connector.

I was just studying up-pipe configuration. Remember, I have the EGR delete (done by other years ago). When this is deleted, is the up-pipe changed out or do they just plug the exhaust port going to the EGR? My truck is at home now and i can't check it out. Starting to wonder if the port is just plugged, maybe the plug came off??

Ryan
You should hear a dramatic sound change between the two. G8orford is sounding like it’s a electric issue. Or you have a VGT problem in cylinder or the advance of the vanes unison ring etc.
I haven’t read all the way through because I’m too damn lazy at the moment. So you may want to hit that DUMP button if I’m sucking air here. Good night fellas I'm throoooooough.

Oh crap good Luck OP.
08-18-2019 09:57 PM
Metalburner Not trying to highjack your thread but I just experienced the exact same thing in my 06 350. Coming down the road and lost boost pressure. Came back about ten minutes later. Then the next morning was there. Cranked that evening and lost it again. I have just replaced the turbo (268k on it) with new and it's doing the exact same as before. I've done the same things and checked the same stuff. The only difference I've noticed on mine is a P0046 code. I've checked the wires going from the VGT solenoid over to the PCM for continuity and they came up good on both of them. I also tried to check them for continuity to the engine to see if they were grounded out, but came up with nothing. I broke down and ordered a new PCM just to rule it out seeing as I don't have another person close by to switch out with. I'm interested to see what you find, and if I find anything, I'll be sure to post up as well.
08-15-2019 06:37 AM
letsmow10
Quote:
Originally Posted by Ryans Rebel View Post
I do hear a very slight (and I mean slight) tone change when I plug in the connector.



I was just studying up-pipe configuration. Remember, I have the EGR delete (done by other years ago). When this is deleted, is the up-pipe changed out or do they just plug the exhaust port going to the EGR? My truck is at home now and i can't check it out. Starting to wonder if the port is just plugged, maybe the plug came off??



Ryan
It can be done both ways, by replacing the up-pipe section or just capping it off. Easy to check.

Sent from my SM-G965U using Tapatalk
08-15-2019 06:31 AM
Ryans Rebel
Quote:
Originally Posted by G8orFord View Post
Do you hear a tone change when you disconnect the VGT connector while the engine is idling?
If the wires are swapped, the VGT will not work. Only takes a few minutes to test. You may want to get another pigtail first though.

You can also try giving the turbo a couple of sharp "taps" with a light hammer in the area circled in the attachment. I've had the mechanism VGT stick on a new turbo before. Do that with the engine running to see if you hear a tone change.

All that said, even with the VGT completely inoperable you should still see SOME boost. I still think you may have a leak somewhere.
I do hear a very slight (and I mean slight) tone change when I plug in the connector.

I was just studying up-pipe configuration. Remember, I have the EGR delete (done by other years ago). When this is deleted, is the up-pipe changed out or do they just plug the exhaust port going to the EGR? My truck is at home now and i can't check it out. Starting to wonder if the port is just plugged, maybe the plug came off??

Ryan
08-15-2019 06:17 AM
G8orFord Do you hear a tone change when you disconnect the VGT connector while the engine is idling?
If the wires are swapped, the VGT will not work. Only takes a few minutes to test. You may want to get another pigtail first though.

You can also try giving the turbo a couple of sharp "taps" with a light hammer in the area circled in the attachment. I've had the mechanism VGT stick on a new turbo before. Do that with the engine running to see if you hear a tone change.

All that said, even with the VGT completely inoperable you should still see SOME boost. I still think you may have a leak somewhere.
08-15-2019 06:13 AM
Ryans Rebel
Quote:
Originally Posted by letsmow10 View Post
Are you sure your uppipe got seated properly to the turbo? No exhaust leak on that side? Disconnect the down pipe from the turbo and that will eliminate the cat.

Sent from my SM-G965U using Tapatalk
Yes, I am sure the up pipe connection is good. However, as i think about it, I too am starting to think perhaps there is not enough exhaust going into the turbo to get it to spin. Tonight I will recheck the up pipe connection to the turbo, and perform another inspection of the up pipes.

I will disconnect the down pipe to eliminate the clogged cat.

Ryan
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