lbz vanes stuck between 76.7% 80.1%

[zuhlke07]

I've got a 2007 lbz with 127k on it,

Randomly started getting the turbo codes, position relearn and turbo vane performance.
So to start with I hooked up efi live, vanes were at 76.7% at idle. If I shifted to 0% it would move to above 74%.
If I moved to 100% it would go to about 80%.
Keep in mind intermittently it would work while driving, or on start up it would work randomly sometimes too.

Took out sensor cleaned it, sprayed some penetrating oil in the sensor hole on top of the vanes.
No difference.
Put a known good sensor in, no difference.
Just replaced vane solenoid hoping that was it. Nothing...

Only thing I can think of is there all gummed up??
Bad turbo?

Can these be cleaned?

 

[bradyn]

Mine was stuck at 0% a couple of weeks ago. I did the same as you, except where the sensor screws in I took a screwdriver and did a little wiggling. It got unstuck and has been fine since.

 

[MarkBroviak]

Most likely a cracked vane plate and it is catching on the housing. With the truck running and your efilive hooked up take a big phillips head screw driver and shove the oil piston cover all the way in and see if it moves on the scan tool or not. The cover is the round aluminum plug on the driverside of the turbo in the middle. Give that a try and see what it does for you. should move all the way in then return back to original position.:thumb:

 

[redws6rocket]

We have been putting a lot of turbos on at work. What I do is unthread the vane sensor and key on I move the sensor end in and out with my thumb and make sure it is able to read correctly. If that's okay i start the truck with the vane sensor out and watch, that thing should sweep one way then back the other when commanded too, and it should be a big sweep. If not I replace the turbo.

 

[adrenaholc1]

Y.

We have been putting a lot of turbos on at work. What I do is unthread the vane sensor and key on I move the sensor end in and out with my thumb and make sure it is able to read correctly. If that's okay i start the truck with the vane sensor out and watch, that thing should sweep one way then back the other when commanded too, and it should be a big sweep. If not I replace the turbo.

I learned that test is not a for sure way to determine a faulty vps. Mine showed 0-100% every time I took it out and pressed it with my finger. Finally thanks to brayden and the fleece crew it was discovered that the voltage from the vps had to be logged to see what was really happening. Turned out the voltage was going the opposite direction. Vane angle decrease-voltage drops. Angle increase-voltage increase. Or vise versa can't remember.

 

[x MadMAX DIESEL]

Y.

I learned that test is not a for sure way to determine a faulty vps. Mine showed 0-100% every time I took it out and pressed it with my finger. Finally thanks to brayden and the fleece crew it was discovered that the voltage from the vps had to be logged to see what was really happening. Turned out the voltage was going the opposite direction. Vane angle decrease-voltage drops. Angle increase-voltage increase. Or vise versa can't remember.

How would that happen? Like the wires were crossed incorrectly or something?

Sent from my PC36100 using Tapatalk 2

 

[adrenaholc1]

No idea. There's more to it than just wires though. I had a thread or two about some vvt issues I was having and had no luck with any troubleshooting procedures. Turns out brayden had a pretty good idea how the electrical system of a duramax works. :thumb: Mans like Gump..a foching genius

 

[zuhlke07]

So take out the big cover on the side by the serial number plate?

I'll give that a try. Going to make a massive mess. Haha

 

[zuhlke07]

Most likely a cracked vane plate and it is catching on the housing. With the truck running and your efilive hooked up take a big phillips head screw driver and shove the oil piston cover all the way in and see if it moves on the scan tool or not. The cover is the round aluminum plug on the driverside of the turbo in the middle. Give that a try and see what it does for you. should move all the way in then return back to original position.:thumb:

Engine off I can get it to move. Engine running I can't hold myself up on the fender good enough to push it in! If I push it in with it off then start it. It returns to center after about a second of running

 

[zuhlke07]

Is there any other diagnosing procedures before I pull it

 

[zuhlke07]

Suppose I'll pull it this weekend if there is nothing else

 

[zuhlke07]

Nothing new on my turbo, probably just pull it here soon

 

[adrenaholc1]

Any luck?