Classic with issues...

#1 by Trucktruck , Fri Jun 21, 2019 8:11 pm

Evenin all...

Still pulling hair out with this,

I found a perished top hat blank on the vacuum system close to the battery, have sorted that, bypassed all of the metal pipework replacing with miners vac pipe, all solenoids, the boost sensor and now the actuator to the vgt changed with genuine parts...

And yet, however I setup the turbo I occasionally get this fluctuating boost, usually under half load to a beat of about once a second. The boost can vary between 0.4 and 1.2 at worst.

I have cybox system, no cat and the egr removed

All leaks are plugged, all the hardware bar the vac sensor t'd into the vgt line on the tb is brand new. I just don't get it

Currently have turbo setup with alot of preload on the actuator, which seems to reduce the issue slightly.

Short of a new ecu I can't see what else it could be!

Any ideas hugely appreciated!!


Trucktruck  
Trucktruck
Posts: 28
Date registered 02.27.2019


RE: Classic with issues...

#2 by Trucktruck , Wed Jul 03, 2019 8:10 pm

Right... So excessive preload didn't work, I've put it back where it all should be and half the time it's great, then I get a seemingly random fit of boost on and off to the tune of 0.5 bar. No fault codes, fuelling is fine as is vac pressure at the pump... Has no one else ever had this issue?


Trucktruck  
Trucktruck
Posts: 28
Date registered 02.27.2019


RE: Classic with issues...

#3 by Heathen , Thu Jul 04, 2019 8:14 am

Have you checked the turbo actuator (and the rest of the vacuum system) for air leaks?


'02 K74 single cab.


 
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Posts: 895
Date registered 05.20.2016


RE: Classic with issues...

#4 by Trucktruck , Thu Jul 04, 2019 9:08 pm

Quote: Heathen wrote in post #3
Have you checked the turbo actuator (and the rest of the vacuum system) for air leaks?


Yes mate, I've replaced the entire vacuum system, removed all hard pipes and tapped into the large bore via the nipple near the fuel pump
I've also fitted a new actuator to the turbo, brand new genuine solenoids and a brand new boost sensor
Egr and cooler are gone, and I've replaced boost hoses too

It's intermittent, sometimes I can drive miles with no issue at all


Trucktruck  
Trucktruck
Posts: 28
Date registered 02.27.2019


RE: Classic with issues...

#5 by keyL200 , Thu Jul 04, 2019 10:20 pm

Sticking turbo vanes? Had to remove mine before when they were stuck with carbon. After cleaning was like a new turbo.


Mitsubishi L200 2004 Warrior 140,000 miles
K&N Air Filter
EGR Blanked
Bigger Alloy Radiator + Digital Temp Gauge
Bigger Intercooler Fan
Manual Locking Hubs
Decat


 
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Posts: 141
Date registered 05.13.2015


RE: Classic with issues...

#6 by Trucktruck , Thu Jul 04, 2019 11:05 pm

Quote: keyL200 wrote in post #5
Sticking turbo vanes? Had to remove mine before when they were stuck with carbon. After cleaning was like a new turbo.

Did that cause a fluctuation or just a sticking? I suppose it couldn't hurt stripping it down


Trucktruck  
Trucktruck
Posts: 28
Date registered 02.27.2019


RE: Classic with issues...

#7 by Heathen , Thu Jul 04, 2019 11:17 pm

I'd be thinking more along the lines of an electrical fault.


'02 K74 single cab.


 
Heathen
Posts: 895
Date registered 05.20.2016


RE: Classic with issues...

#8 by Trucktruck , Sat Jul 06, 2019 7:52 pm

Quote: Heathen wrote in post #7
I'd be thinking more along the lines of an electrical fault.

Would that not throw some sort of fault?
I know what you mean, intermittent always points at electrical in my eyes


Trucktruck  
Trucktruck
Posts: 28
Date registered 02.27.2019


RE: Classic with issues...

#9 by mikeinatruck , Sat Jul 06, 2019 11:00 pm

Many years ago I had random boost issues, turned out the vanes were sticking, they are quite prone for it, some try cleaning it with mr muscle oven cleaner but if you can get the down pipe off to that you might as well try removing the casting to get at the VGT, remove it and check it. If its sticking then removing the rod and turning the spindle by hand usually shows it up it'll feel notchy or have a lot of play in it


2011 Warrior (Big Red)
265 70 17 BFGs
EGR delete
Thats about it for now.....

RIP - 2003 Oriental burgundy and silver. (curse you evil Corsa driver)


Range Rover Vogue and a Land Rover 90 V8 Tray Back for fun.


 
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Posts: 505
Date registered 11.02.2011


RE: Classic with issues...

#10 by Trucktruck , Mon Jul 08, 2019 9:04 pm

Quote: mikeinatruck wrote in post #9
Many years ago I had random boost issues, turned out the vanes were sticking, they are quite prone for it, some try cleaning it with mr muscle oven cleaner but if you can get the down pipe off to that you might as well try removing the casting to get at the VGT, remove it and check it. If its sticking then removing the rod and turning the spindle by hand usually shows it up it'll feel notchy or have a lot of play in it



I think that's all I have left to try! Roll on the weekend


Trucktruck  
Trucktruck
Posts: 28
Date registered 02.27.2019


   

2009 Front Shocks
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