Duramax Diesels Forum Truck of the Week
  #1  
Old 04-03-2018, 03:26 PM
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Default Turbo/boost or ecm issue

Trucks done, runs and sounds good, but... at 1500 rpms in all tunes the turbo canes are shutting all the way and making way too much boost, if you hold it at 1500 rpms it comes and goes like its doing a vane sweep, Iím stumped.
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Old 04-04-2018, 05:55 AM
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Any drive pressure leaks? If not, the next thing to check would be the vane position sensor and actuator.
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Old 04-04-2018, 07:16 AM
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Originally Posted by WVRigrat05 View Post
Trucks done, runs and sounds good, but... at 1500 rpms in all tunes the turbo canes are shutting all the way and making way too much boost, if you hold it at 1500 rpms it comes and goes like its doing a vane sweep, Iím stumped.
put the stock tune in it and see if it still does it. if so, hard part issue. if not, tune issue. the unison ring may have rusted up some from sitting and is now sticking a bit
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Old 04-04-2018, 08:17 AM
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put the stock tune in it and see if it still does it. if so, hard part issue. if not, tune issue. the unison ring may have rusted up some from sitting and is now sticking a bit
Iím gonna take it out and log it, if the ring is sticking what do I do? Pull the turbo?
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100k miles. Piston eater.

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Old 04-04-2018, 08:53 AM
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Originally Posted by WVRigrat05 View Post
Iím gonna take it out and log it, if the ring is sticking what do I do? Pull the turbo?
basically or keep driving it and see if it will loosen up. actuator could have a bad spot in it as well
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Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 04-04-2018, 12:23 PM
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basically or keep driving it and see if it will loosen up. actuator could have a bad spot in it as well
It squeals over 2,000 rpm under a load, donít have a clue what that means.
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The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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Old 04-04-2018, 12:35 PM
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Originally Posted by WVRigrat05 View Post
It squeals over 2,000 rpm under a load, donít have a clue what that means.
If it squeals you probably have a boost leak and need to make a leak tester.
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Old 04-04-2018, 12:52 PM
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probably an exhaust leak. that would not help the surging issue either. look for soot around all exhaust gaskets. pulling the up pipes and looking at the gasket for any soot coming out between where its suppose to seal will tell you right away too. most of the time the leak is at the up pipe gaskets somewhere.
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Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 04-04-2018, 12:52 PM
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I have found a squeal under load is typically a driver pressure leak from an up-pipe gasket.
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Old 04-04-2018, 01:16 PM
Bdsankey Bdsankey is offline
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Originally Posted by Chevy1925 View Post
probably an exhaust leak. that would not help the surging issue either. look for soot around all exhaust gaskets. pulling the up pipes and looking at the gasket for any soot coming out between where its suppose to seal will tell you right away too. most of the time the leak is at the up pipe gaskets somewhere.
Problem with pulling the gaskets is 9/10 (in my area/experience) the bolts break off in the manifold.
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Current Rides:
1) Toy: 2005 LLY ECSB, Leather, Sunroof
-820hp/1748ft-lbs @ Duramax Tuner (6/25/18)
-Built Motor, Bullseye Batmowheel S475/87/1.0 "Comp R75", Exergy 250% overs with "Redman" internal mods, Exergy 14mm street pump w/AN feed, Goerend "J" Converter, Built Trans, AD2 165, Beans Sump, E-Locker, TrueTrac, Yukon 4340 Shafts, Traction Bars, DHD Center Link Brace, DHD Lower Crossmember Support


Past Rides:
1) 2002 LB7 CCSB, Leather, Loaded
-New Bosch Reman Injectors, New LBZ CP3, FASS 150, RCD Sump, 3" MBRP Downpipe, 4" Downpipe Back w/ Muffler, Sleeves, DHD Centerlink Brace, DHD Lower Crossmember Support, Steering Wheel Radio Control Swap
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Old 04-04-2018, 01:18 PM
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Quote:
Originally Posted by Bdsankey View Post
Problem with pulling the gaskets is 9/10 (in my area/experience) the bolts break off in the manifold.
hes already had the top end off. if they break off now, its cause they cross thread and never fully tighten so regardless, he will have a leak. hot engine, soak of penetrating oil and a wrench get them out every time for me but i dont deal with the back east rust bull shit.
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Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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  #12  
Old 04-04-2018, 01:21 PM
Bdsankey Bdsankey is offline
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Originally Posted by Chevy1925 View Post
hes already had the top end off. if they break off now, its cause they cross thread and never fully tighten so regardless, he will have a leak. hot engine, soak of penetrating oil and a wrench get them out every time for me but i dont deal with the back east rust bull shit.
Yeah, everything here is rusted to hell. Friends 2011 LML broke 5/6 lower up-pipe bolts @ 112k miles when we were trying to change gaskets.
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Current Rides:
1) Toy: 2005 LLY ECSB, Leather, Sunroof
-820hp/1748ft-lbs @ Duramax Tuner (6/25/18)
-Built Motor, Bullseye Batmowheel S475/87/1.0 "Comp R75", Exergy 250% overs with "Redman" internal mods, Exergy 14mm street pump w/AN feed, Goerend "J" Converter, Built Trans, AD2 165, Beans Sump, E-Locker, TrueTrac, Yukon 4340 Shafts, Traction Bars, DHD Center Link Brace, DHD Lower Crossmember Support


Past Rides:
1) 2002 LB7 CCSB, Leather, Loaded
-New Bosch Reman Injectors, New LBZ CP3, FASS 150, RCD Sump, 3" MBRP Downpipe, 4" Downpipe Back w/ Muffler, Sleeves, DHD Centerlink Brace, DHD Lower Crossmember Support, Steering Wheel Radio Control Swap
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Old 04-04-2018, 03:18 PM
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It’s definitely a boost leak close to the cab, I took it out and it got worse fast, those up pipes are an sob with the cab on, guess I’ll tear back apart. I used new gaskets and even torqued the bolts.
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05' Black Chevy CC/SB LT- Blackout Performance built motor/trans/tuning- Gone

The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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  #14  
Old 04-04-2018, 03:35 PM
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Quote:
Originally Posted by WVRigrat05 View Post
Itís definitely a boost leak close to the cab, I took it out and it got worse fast, those up pipes are an sob with the cab on, guess Iíll tear back apart. I used new gaskets and even torqued the bolts.
its not uncommon that the "new gaskets" didnt seal... i actually reuse the factory up-pipe gaskets if they are in good shape still
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Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 04-04-2018, 07:21 PM
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Passenger side up pipe and manifold was loose, I’ll not torque used rusty bolts again, good to go now. No soot anywhere until I pulled it apart and looked at the gaskets like you said James.
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The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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