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nissan patrol gu
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Discussion Starter #1
Hi all. I need help please. I have a 2000 model GU11 ZD30.

All of a sudden it has lost power, blowing lots of black smoke. Boost will go no higher than 4psi. EGts are around 700 degrees also under load:(

Have replaced air filter and air box seal. Haven't done fuel filter yet only has 10000 klms approx.

Apart from no boost and lots of smoke it still goes ok, but will not pull uphill. Only started yesterday.

Where do I look. Intercooler, turbo, filter????.:roll:

Have checked MAF and all voltages are ok.

Thanks guys :headwall:
 

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Autos are Superior
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11,701 Posts
5 mins with the search....
Search: Keyword(s): power, loss ; Forum: Nissan Patrol GU/GR and child forums


Good luck with it.

http://www.patrol4x4.com/forum/niss...ference-document-zd30-owners-look-here-31418/

http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/maf-41657/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/maf-cleaning-12374/?highlight=power+loss
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/zd30-sudden-power-loss-54763/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/zd30-no-power-out-ideas-44705/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/zd30-cracked-head-54835/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/zd30-no-power-out-ideas-44705/?highlight=power
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/plenty-boost-but-no-power-57001/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/please-help-me-my-2002-3lt-patrol-49600/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/random-power-loss-53284/?highlight=power+loss
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/loss-power-53653/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/04-model-zd30-intermittent-power-loss-54117/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/2003-gu-3l-zd30-how-do-i-reset-ecu-55706/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/brief-power-loss-3500rpm-then-fine-57829/
http://www.patrol4x4.com/forum/niss...encing-power-loss-52757/?highlight=power+loss
http://www.patrol4x4.com/forum/niss...other-zd30-dieing-49719/?highlight=power+loss
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/help-please-power-loss-48049/
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http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/zd30-down-power-22903/
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http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/im-back-need-urgent-help-46160/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/power-loss-3-0-lire-2003-st-l-40803/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/loss-power-40220/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/intermittent-power-loss-3-0l-diesel-42290/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/gu-2000-3-0tdi-lacks-power-41608/
http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/intermittent-loss-power-42835/
 

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BTW you may now own a terrific boat anchor that was called your block.
 

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ZD30 Out - L77 In!
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Frank,

Start by checking your intercooler and hoses for splits or being loose. You’re obviously running too rich, so you may be loosing air after the MAF.
 

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Discussion Starter #6
Thanks Chaz. Have checked intercooler, no leaks. All hose are good, no holes or loose clamps.
Did the voltage check on MAF, all ok. Dont have access to another Maf to check differences. Currently on a property 100klms Canberra, 70klms Goulbourn. Still searching.

PS, could it be injectors, would a faulty injector cause boost to drop. Have adjusted dawes and needle valve, makes no difference
 

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could be a stuffed actuator on the turbo opening the gate at a low psi spring has probably colapsed in the actuator. also pull your oil filler cap off the top of the motor tell us if theres any smoke choofing out of there.
 

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if you try this be very careful and do not put the car under too much load its just to check if it the actuator is stuffed. what you need to do is pull the vac hose of the actuator. !!!Note by doing this your boost level will not regulate at the required boost it will keep boosting untill the motor blows up to put it bluntly so just take it easy as soon as you notice the boost level exeeding 4psi and driving better dont go over say 8-10 psi then park it up and put a new acuator on it. by all means take it easy and you wont have a problem, i will not be held accountable if you go wippin dounuts in the gravel. hahaha
 

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ZD30 Out - L77 In!
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Frank, check to see if the turbo actuator is pulling up the VNT lever or arm when you start the car. If not your problem could be as sutto suggested, a faulty actuator. Also, make sure you have good vacuum to the actuator, eg around 30Hg.

Doubt very much that it's injectors. Leaking injectors will make the engine knock and run very rough. Sounds more like turbo VNT system not working if intake system is sealed ok. Also, blocked air filter may be the culprit.
 

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Discussion Starter #11
Thanks a lot for ideas. I will check actuator in morning and post up result. Hopefully it can be sorted. also can you purchase actuator separately or is it recommended to replace the entire turbo. Turbo is original.
 

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ZD30 Out - L77 In!
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Unfortunately, not from Nissan. They will only sell a complete turbo. There have been a few good second hand ones sell on ebay. I picked one up with 40K on it for $150 a few years ago. New turbo from NIZBITS is around $1500. In many cases, if the VNT system has siezed or jammed with soot, they can be cleaned out and freed up so they work again.

Chances are it could just be a leaking vacuum hose.
 

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you can always adapt another actuator to the turbo from a differnt model that runs the same boost just have to make an adaptor bracket you may even get lucky and find one that bolts on. how much boost is your turbo suposed to be making?
 

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Discussion Starter #14
Hi Guys,

Really appreciate the assistance you have given. Did the actuator check, no movement, however I reassembled everything, replaced a couple of clamps and went for a test run.

Patrol is going much better. I am getting 10 psi @ 2800rpm and 4 psi @100Klms in top gear cruising at 2000 rpm.

Question, No movement at actuator on startup, does this matter. ??? :):):)
 

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ZD30 Out - L77 In!
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Frank,

The ZD30’s vacuum controlled actuator should pull up to the stop screw as soon as you start the engine. After the engine warms up it should fluctuate slightly because the EGR valve will be operating, but as soon as you touch the throttle it should pull up hard. Mine is always up against the stop screw but I have manual boost control.

You can pull the vacuum line off the control solenoid at the front of the engine bay, just next to the air filter and test it with a vacuum gauge, you should have 28 – 30Hg. It’s the hose that comes from the vacuum pump on the other side of the engine or port “B” which is further away from the solenoid and at the turbo side.

You may have a leaking vacuum hose or a faulty solenoid. Another way to test is to put the vacuum pump pipe straight onto the turbo actuator and bypass the solenoid. This will give you full boost all the time, so take it easy. It will prove if you have a faulty solenoid if you get 25psi with some throttle under load.
 

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ZD30 Out - L77 In!
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nope should only move when your turbo hits the required boost(10psi) to release exess exaust pressure.
sutto,

Your advice would be good if we had a wastegate on the ZD30 Patrol turbocharger. Unfortunately our VNT turbocharger is vacuum controlled and not controlled by pressure, so the actuator works in the opposite way. Variable nozzle turbo’s don’t have a wastegate.
 

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sutto,

Your advice would be good if we had a wastegate on the ZD30 Patrol turbocharger. Unfortunately our VNT turbocharger is vacuum controlled and not controlled by pressure, so the actuator works in the opposite way. Variable nozzle turbo’s don’t have a wastegate.

there ya go learn somthing every day. cheers Chaz
 

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Discussion Starter #20
Frank,

The ZD30’s vacuum controlled actuator should pull up to the stop screw as soon as you start the engine. After the engine warms up it should fluctuate slightly because the EGR valve will be operating, but as soon as you touch the throttle it should pull up hard. Mine is always up against the stop screw but I have manual boost control.

You can pull the vacuum line off the control solenoid at the front of the engine bay, just next to the air filter and test it with a vacuum gauge, you should have 28 – 30Hg. It’s the hose that comes from the vacuum pump on the other side of the engine or port “B” which is further away from the solenoid and at the turbo side.

You may have a leaking vacuum hose or a faulty solenoid. Another way to test is to put the vacuum pump pipe straight onto the turbo actuator and bypass the solenoid. This will give you full boost all the time, so take it easy. It will prove if you have a faulty solenoid if you get 25psi with some throttle under load.
Thank you, I will check in morning. I have blocked EGr and dawes valve and boost controller have been fitted, I will refer back to your diagram to make sure all hoses are correct.
 
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