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4th December 2017, 10:26 PM
#1
Expert
ZD30 ... Low boost
Hi members
Need some advice !
Nissan 2005 GUIV zd30
l have dawes set up , needle valve, egr . etc. My patrol has been running fine last few years. Last week i realised my Boost was lower than usual . I though it was probably need adjustment. I stretched the spring and it was set fine back to normal. A few days later , Im struggling to get over 10Psi , with crap fuel economy. I tried to stretch the spring again. Didn't work , I also ordered some more heavy duty springs, still couldnt get past 10psi.. I tried another Dawes valve, still struggling to reach 10psi. I played around with the needle valve, the actuator level moved .
I'm thinking maybe the wet weather had something to do with it. I couldnt find any obvious boost leaks .
Any ideas guys ?
TIA
Limmy
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4th December 2017 10:26 PM
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5th December 2017, 01:25 AM
#2
ZD30 ... Low boost
Egr stuck open? Unless it’s blocked that is.
Otherwise check all turbo and intercooler pipework for loose hose clamps, boost gauge lines, intercooler etc for leaks
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Limmy (6th December 2017)
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5th December 2017, 04:56 AM
#3
Expert
EGR blocked. Can I do the soapy water trick to test the lines and pipes. Will it still have boost pressure while it idling so I can test ?
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5th December 2017, 02:22 PM
#4
Patrol God
What intercooler do you have, if its the OE one chances are its leaking.
easy to check if its oily its leaking
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
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Limmy (6th December 2017)
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5th December 2017, 03:38 PM
#5
Expert
I got a welded intercooler. I did notice a bit of oil around my boost sensor on the intercooler. I got one of those boost gauge adapter's that sandwich between intercooler and boost sensor. Maybe that leaking . I might silicone it
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5th December 2017, 04:07 PM
#6
Patrol Freak
Sounds like it could be a vacuum problem to me. Soapy water won't show a vacuum leak. Usually the hoses split in the most difficult to see spot. You will have to check the hoses one at a time.
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Limmy (6th December 2017)
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5th December 2017, 04:43 PM
#7
Originally Posted by
threedogs
What intercooler do you have, if its the OE one chances are its leaking.
easy to check if its oily its leaking
^^^^^This...
Originally Posted by
Limmy
I got a welded intercooler. I did notice a bit of oil around my boost sensor on the intercooler. I got one of those boost gauge adapter's that sandwich between intercooler and boost sensor. Maybe that leaking . I might silicone it
....and this.
Boost leak 100%.
And no need to stretch the spring in the dawes anymore. This issue was corrected with a stronger spring about 3 years ago. Unless you have one of the older Dawes with the old spring then disregard my comment.
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The Following 2 Users Say Thank You to mudski For This Useful Post:
Limmy (6th December 2017), threedogs (6th December 2017)
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5th December 2017, 09:41 PM
#8
Expert
i had the older one. ive put on another one ( smaller one with ceramic ball ).. Where would the vacumm hoses be located ? Im going to buy new silicone hoses tomorrow. clean my intercooler.
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5th December 2017, 11:21 PM
#9
Patrol Freak
Start at the hose connected to the turbo actuator and work back to the vacuum pump located on the front of the engine. Also - there are vacuum hoses connected to solenoids under the intercooler. That was where mine were split.
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The Following User Says Thank You to BillsGU For This Useful Post:
Limmy (6th December 2017)
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6th December 2017, 08:20 PM
#10
Expert
I think i may have found the problem. While i was replacing all the lines with new silcone ones. i was removing old line from the " boost gauge inline filter " i notice it had a crack and split apart a bit when i pull it. It has some black soot in between the joins. I blew air and it definately is leaking.
Hope that is the main problem ! im ordering another filter
keep you posted !
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The Following 4 Users Say Thank You to Limmy For This Useful Post:
AB (6th December 2017), Flippa74 (13th December 2017), mudski (6th December 2017), threedogs (7th December 2017)