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I've been at it for a few days now. But it's been an issue for a while now. I've been having a long battle with boost. Read as much as I can but I'm hitting a wall
As mention 2001 GU2 Patrol ZD30 having boost issue.
Dawes & Needle Valve, EGR Block, Catch can, Cross Country Intercooler all installed. 6+ years now
I replaced boost and EGT gauges for better readings. Previous owner installed EGT and a boost gauge that had negative values both was cheapies from the bay. Replaced with SAAS muscle digital series.
Most recent issue is very low boost. 5psi if i give it alot.
- Checked and cleaned Dawes. Added more pressure on the ball no change.
- Turned the needle all the way down (closed) also backed it off in 1/2 turn intervals no noticeable difference
- Cleaned the MAF sensor.
- Pulled the intercooler off, cant see any oil spray, stains signs of leak on intercooler.
- Checked all the hose and clamps from throttle to intercooler to turbo - no stains or signs of leak, no damage or hole I can see.
- I've replaced all 4mm hoses that I know of.
And this is about where my understanding taps out.
- I know the waste gate actuator goes down when I pull the line off it and up when I push it on.
- I also have vacuum from the vacuum pump, not sure how strong should it be?
I need some help on what to check next, as well as how to check the actuator and vacuum pump are working correctly.
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