Sticking Turbo Question
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Posting Guru
Joined: Apr 2015
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From: Yakistan, WA
Sticking Turbo Question
Hey guys,
I wanted to know, that if my turbo is sticking in the "open" position, will I be okay to drive it?
The VGT when Idling is 14-25, sometimes higher.
When cruising on the highway the VGT is showing 40-57.
So far the VGT wont show anything above above 60.
Here's my thinking : Turbo sticking open is still letting exhaust gases through; Turbo sticking closed builds up pressure to blow engine by not letting gases through.
Am I on the right path of thinking there?
I am was going to purchase a new turbo this late spring, since I just finished cleaning this one 2 weeks ago. The inspection did not look good at all.
Thanks - Preston
I wanted to know, that if my turbo is sticking in the "open" position, will I be okay to drive it?
The VGT when Idling is 14-25, sometimes higher.
When cruising on the highway the VGT is showing 40-57.
So far the VGT wont show anything above above 60.
Here's my thinking : Turbo sticking open is still letting exhaust gases through; Turbo sticking closed builds up pressure to blow engine by not letting gases through.
Am I on the right path of thinking there?
I am was going to purchase a new turbo this late spring, since I just finished cleaning this one 2 weeks ago. The inspection did not look good at all.
Thanks - Preston
Thread Starter
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Posting Guru
Joined: Apr 2015
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From: Yakistan, WA
Thanks. I was watching the boost. It all stayed in spec. Last time it was sticking closed. Now it's sticking open. At least if it's gonna stick, it's gonna stick open.
Now I have to have the conversation with my wife about getting a new turbo sooner.
Now I have to have the conversation with my wife about getting a new turbo sooner.
Postmaster
Joined: Jan 2005
Posts: 4,424
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From: BC Canada
What boost are you seeing wide open throttle, at high speed on a hill? You should be able to see 26-28 psi, but it will only do it at higher speed in higher gears to boost over 20 psi. Lower gears it should hit 20 on a hill. Did you use the antisieze with copper in it on the VGT vanes?
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Posting Guru
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From: Yakistan, WA
What boost are you seeing wide open throttle, at high speed on a hill? You should be able to see 26-28 psi, but it will only do it at higher speed in higher gears to boost over 20 psi. Lower gears it should hit 20 on a hill. Did you use the antisieze with copper in it on the VGT vanes?
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
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From: Fresno, CA
What are you using to monitor the VGT? On the Scan-gauge at least, the numbers you are giving are backwards, typically VGT starts high in the low 80s at idle and will drop as the vanes open. I think fully open is around 30.
Also, the "VGT" display is only the command % that the PCM is giving to the VGT actuator. I don't believe there is any feedback from the VGT telling the PCM what the VGT is actually doing. I don't think just watching the VGT will tell you if the turbo is sticking.
Also, the "VGT" display is only the command % that the PCM is giving to the VGT actuator. I don't believe there is any feedback from the VGT telling the PCM what the VGT is actually doing. I don't think just watching the VGT will tell you if the turbo is sticking.
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Posting Guru
Joined: Apr 2015
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From: Yakistan, WA
What are you using to monitor the VGT? On the Scan-gauge at least, the numbers you are giving are backwards, typically VGT starts high in the low 80s at idle and will drop as the vanes open. I think fully open is around 30.
Also, the "VGT" display is only the command % that the PCM is giving to the VGT actuator. I don't believe there is any feedback from the VGT telling the PCM what the VGT is actually doing. I don't think just watching the VGT will tell you if the turbo is sticking.
Also, the "VGT" display is only the command % that the PCM is giving to the VGT actuator. I don't believe there is any feedback from the VGT telling the PCM what the VGT is actually doing. I don't think just watching the VGT will tell you if the turbo is sticking.
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Lead Driver
Joined: May 2014
Posts: 6,545
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From: Virginia Beach VA
Have you got that tuning to make the vanes move every 10 minutes or something like that?
I can get mine to just under 25 on hard throttle but not 14 and normal idle around 70'ish.
I can get mine to just under 25 on hard throttle but not 14 and normal idle around 70'ish.
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Posting Guru
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From: Yakistan, WA
1st: vgt 30 psi 20
2nd: psi 22
3rd: psi 22-24
4th: vgt 30 psi 26-28
5th : psi 24
Multiple test done. Hard to looks at the readings and be speeding at the same time.
All at WOT
2nd: psi 22
3rd: psi 22-24
4th: vgt 30 psi 26-28
5th : psi 24
Multiple test done. Hard to looks at the readings and be speeding at the same time.
All at WOT
Postmaster
Joined: Jan 2005
Posts: 4,424
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From: BC Canada
It looks to me that you don't have a problem, this is what I would expect to see with a normally acting VGT. As long as your boost is building to 20 and 28 respectively I don't see that you have a problem. Are you getting epany black smoke? If not, you are likely good. A small amount of black smoke at initial wide open throttle apwhich dpfades to zero is fine too, expspecially if you have a FICM 40 Hp tune, like I do.
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Posting Guru
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From: Yakistan, WA
It looks to me that you don't have a problem, this is what I would expect to see with a normally acting VGT. As long as your boost is building to 20 and 28 respectively I don't see that you have a problem. Are you getting epany black smoke? If not, you are likely good. A small amount of black smoke at initial wide open throttle apwhich dpfades to zero is fine too, expspecially if you have a FICM 40 Hp tune, like I do.
My concern isn't with the vgt duty while driving. More of at idle. At idle it is in the low 20's to teens. I can also hear a difference in the idling, as in all throaty sound no turbo whistle like at normal.operation. Also when the vgt is at 14 -25 while idling and then I take off the turbo lags HARD. These are my concerns.
Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
I suspect my truck is having similar issues. How is your fuel consumption? The only thing that worries me about driving it like that is I'm seeing 8.5-9.0 mpg and a little concerned about unburned fuel causing soot to build up quickly and the fuel possibly washing the oil from the cylinders.
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Posting Guru
Joined: Apr 2015
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From: Yakistan, WA
I suspect my truck is having similar is2sues. How is your fuel consumption? The only thing that worries me about driving it like that is I'm seeing 8.5-9.0 mpg and a little concerned about unburned fuel causing soot to build up quickly and the fuel possibly washing the oil from the cylinders.
The fuel consumption was exactly what I was thinking of today. Today is the first day of this going on. But given I drive 76 miles round to work , Monday - Friday, I will soon find out.
I know, by the condition of the turbo when I cleaned it, that it is a matter of fact that it needs to be replaced, and it is sticking.
Just not sticking as bad as before cleaning it.
Where are you concerned about the soot being built up?
Logistics Pro
Joined: Feb 2013
Posts: 4,073
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From: TX
Talk about mpg taking a dive. When my ebp sensor went out this time i could tell right away. Then with the turbo sticking (running boost like your going up a hill pulling 15k but actually unloaded ) it was cut to half. Same as you no smoke. Pistons were sooted like crazy but that could be normal i suppose.