Patrol 4x4 - Nissan Patrol Forum banner

1 - 20 of 88 Posts

·
Registered
nissan gu LWB + 350 chev mq SWB
Joined
·
113 Posts
Discussion Starter · #1 ·
hi all, im after some advice/new ideas to look for.
i have series 2 gu wagon with the zd30 engine. my problem is i have absolutly no power available at all. im talking a semi can (and has!) beat me of the line when i have my foot to the floor.
i have fitted a boost gauge that registers up to 13-14 pounds of boost
new air filter
intercooler has no leaks
vacuum lines seem in good order
turbo seems in good order
maf sensor volts are reading normal (going off a thread i found on this site)
i even dropped my exhaust to see if it has blockages.
any help would be great!
thanks
 

·
Registered
nissan
Joined
·
11,162 Posts
they are all gutless pos anyway so nothing out of the ordinary here.......

no in all seriousness. get some maf cleaner and clean that, also boost afaik is a bit low for a zd30. thought usually up around 15 to 17psi.
make sure your intake manifold isnt all gummed up and full of chit due to egr valve.
how many kms on engine? when was the fuel filter last changed. no rags or chit in the snorkel or intake lines,
also check that you are actually getting full pedal travel ie no thongs, kids toys, floor mats or sex toys wedged under the pedal. this could also cause whats happening now and its wouldnt be the first time ive heard it happen.
also does engine light come on, does it come and go the power or just useless all the time???
 

·
Registered
nissan gu LWB + 350 chev mq SWB
Joined
·
113 Posts
Discussion Starter · #3 · (Edited)
cheers benos, the only thing it could be out of all of those is the manifold gumed up. i will take it off tomorrow for a good look.
the engine has nearly done 290000klm. feul filter was done during the last service, no rags or sex toys haha.
the engine light has never come on, i even read the post by whitie i believe about engine fault codes, it keeps coming up 0505 meaning no faults detected.
it also doesnt blow any smoke at all, idles nicely.
my only other thought is could it possibly be the injectors? i spoke to a injector specialist in geelong and he more or less told me that if it was the injectors the car wouldnt run at all????????
 

·
LED ZEPPELIN
1995 GQ TD42 NA
Joined
·
12,022 Posts
That lack of performances sounds a lot like when my CRD went into limp mode.
 

·
Registered
nissan gu LWB + 350 chev mq SWB
Joined
·
113 Posts
Discussion Starter · #5 ·
That lack of performances sounds a lot like when my CRD went into limp mode.
i read something about limp mode on another post, but im not sure what it is, this is my first turbo diesel 4wd, my others were petrol so iv still got alot to learn.
what are the main causes for limp mode?
how do you find out if it is limp mode?
thanks for your input :cool:
 

·
Registered
nissan
Joined
·
11,162 Posts
usually if it goes into limp mode the engine light will come on. you can back off or stop and turn off the truck and its back to normal.
id pull off a couple of intake hoses post egr valve and have a look. i have a feeling this could be your main issue.
as for injectors i doubt it. if they were bad it would be smokey and its possible wouldnt run.
its still worth cleaning the maf sensor though or even replacing it. they aint that expensive and if nothing else its not a bad thing to replace. the potential of these things to cause damage is quite big. if you dont know what it is or what it can do to a zd30 do a search on them. plicks of things.
 

·
Livin' the Dream
nissan patrol
Joined
·
127 Posts
Have you tried disconnecting the battery over night. Have read that this resets the computer so it's worth a go.
 

·
Registered
nissan gu LWB + 350 chev mq SWB
Joined
·
113 Posts
Discussion Starter · #8 ·
Have you tried disconnecting the battery over night. Have read that this resets the computer so it's worth a go.
hi grasea, yes iv had the battery disconnected overnight whilst i was installing a dual battery system,
tomorrow il have a go at cleaning all the intake/pipes and see if that helps, hell im that desperate to get it right if it wasnt raining cats and dogs id be out there starting to pull it apart now.......
 

·
Registered
nissan gu LWB + 350 chev mq SWB
Joined
·
113 Posts
Discussion Starter · #9 ·
ok people, iv taken off the manifold and there is a bit of soot around the edges but nothing remotly restrictive. cylinder no.4 (closest to the firewall) was a bit oily, the other 3 dry. but this is not my power problem......... what is going on :( pulling my hair out!
 

·
Registered
nissan
Joined
·
2,707 Posts
When you mention that the fuel filter was changed at last service, how long ago was that and when did the symptoms start to appear?

Have you looked at getting an ECUTalk unit, great bit of kit for seeing what the ECU sees from the sensors including MAF and TPS.
 

·
Currently in PAD rehab
Joined
·
18,404 Posts
usually if it goes into limp mode the engine light will come on. you can back off or stop and turn off the truck and its back to normal.
On this di zd30 the engine MIL light doesn't come on or register an error for limp mode. It will register a code and MIL for a MAP sensor fault but that doesn't induce limp mode.

290,000km is getting up there, but with no smoke this is a doosey.

Does the engine rev freely, and do you have an egt gauge?

Sounds like lack of fuel or boost.. anything else changed recently?
 

·
Registered
Joined
·
226 Posts
Blocked fuel filter?

Split in fuel line? Is the primer hard after you shut it down? Might be sucking air somewhere.
 

·
Registered
nissan gu LWB + 350 chev mq SWB
Joined
·
113 Posts
Discussion Starter · #14 ·
thanks for all your replies, as for answers here we go:)
the last service was done 4500 klms ago, i know how much diesels hate to be neglected and as its my daily runner for work (towing my trailer) and my number 1 toy reliability is everything to me.
as for fuel cleaner when i first got it i put injector cleaner through and recently (last week) i put some of that chemtech diesel power additive.
ECUtalk iv only just heard about yesterday so im interested in learning more about that.
the engine revs through, apart from having no go in it it runs beautifully and smootly, never skips a beat......???? no i dont have an egt gauge... yet! can anyone recommend a good brand?
now champ what you say about the fuel primer is very interesting, i only noticed this yesterday when i was putting the motor back together that the primer button took a good 4 presses to make hard, once it was hard i continued putting the intercooler back on and by the time i finished it took another 3 pushes...... sucking air maybe? would it still run as nice as it does if it was sucking air?
and what it the best way to test this?
once again i really appreciate all of your ideas and comments :) thank-you
 

·
Registered
Joined
·
585 Posts
Could have got a dose of crap fuel and half clogged the filters,there is some dodgy fuel out there believe me.



*Does the ZD30 have a gauze filter on the pump?
 

·
Registered
nissan gu LWB + 350 chev mq SWB
Joined
·
113 Posts
Discussion Starter · #16 ·
its had a change of filters and fuel cleaners run through it, and it wouldnt run smoothly with crap fuel would it?
 

·
Registered
Joined
·
1,873 Posts
Doesnt sound like limp mode, make sure all hose clamps are tight and there is nothing slipping off under boost. particualr the hoses to intercooler, give them a tug to make sure that you can't pull any away from position.
13psi is a little low. Most of us are around 16-18psi.

Keep us updated
 

·
Registered
07 Black Patrol 3.0 / 04 Grey 3.0 Patrol / 01 3.0 Patrol
Joined
·
1,562 Posts
probably as above drawing air someplace.......but shane there is probably on the money there with the low boost,so it's mostly a turbo issue,probably tired now,had it a hard life before you got it,turbos can just get weak.
 
1 - 20 of 88 Posts
Top