NISSAN 3.L ENGINE FAILURES

... and will do anything to prevent motor failure

sell it and buy a 4.2

dear davoe.
not all people read western 4wder in fact ive never heard of it.
acdc is just letting people know about the problem before a major problem happens.
cheers.

Not surprising I guess seeing as it is a WA product but worth getting your hands on when you get sick of those eastern states repetitive mags (OL, 4wd ov, 4wd monthly) asd they crap all over these mags for goood trip reports (fully tripnoted at lest 2 per mag) unfortunatly they are all west oz trips and with the outstanding amunt of out of the way tracks there is no need for regurgitating old stuff

We had another 3.0l last week he was complaining of poor fuel economy 16l per 100km's so we fitted a boost gauge it was peaking at 25lb we then fitted a new air flow sensor and the boost returned to 15lb and accassionally reached 20lb when booted, the car is now 100% to drive and fuel economy is approx 12l per 100km's.

Does the 3L engine have a ready-made plug that can be used to fit a boost gauge, or is it a case of drilling/tapping a suitable hole?
I have a mate with a 3L Patrol and I've suggested to him that a boost gauge would be a good idea. Maybe a EGT gauge too.
Cheers
Roachie

gid'ay all
did i read on the forum that the navara 3.0ltd does'nt have a variable vane turbo,they done't have the intercooler,so maybe not.
can someone varify this for me,thanks.
cheers toohey

ACDC, Where do you plumb your boost guage in to get a measurement?

Leroy

Ain't technology wonderfull? It is a real worry that these high tech modern diesel engines have not got their act together yet. Nissan, who perfected the RB30 turbo engine in the 80's and have the Skyline GT to their credit are still stuffing up on turbo diesels?

An oxygen sensor on a diesel 3.0l??

Where is this oxygen sensor? I would like to check it.

There is no oxy sensor on a 3.0l t/d

You have no throttle on a 3.0l it is all controlled by the computer,the turbo is variable vane type which has no waste gate, so if the fuel control is not right the turbo works overtime.

Snowy 3.0iTD

The nissan system is very efficient apart from being somewhat unreliable. The problem with using a waistgate is that the air flows through the airflow sensor telling the ecu to supply the correct amount of fuel. If the air is then dumped through the waistgate the engine gets overfuelled. This isn't a problem with a petrol motor, but can be on a diesel. The same applies for a blow off valve.
Nissans turbo doesn't exhaust excess pressure, but shouldn't even produce it.

Chaz

G'day Motherhen,

I asked the same question (above), as did Leroy.......seems like ACDC isn't following this POST any longer.......might need to make a new post headed up......"ACDC: your info is needed"......or similar

Motherhen, a boost guage is available from Autobarn or Supercheap or whatever auto store you have in your area. They come in 2 distinct types, 1 is a boost and vacuum guage and 1 is a boost gauge only. Seeing as your vehicle is a diesel which doesn't have vacuum just get a plain boost gauge, any of the reputable brands will do. I like VDO gauges myself others like Autometer or other brands, there's no need to spend a fortune just get one that reads to 25psi or more approx 1.5 or more bar in the metric scale.
I'm not exactly sure where you can plumb in a pressure line on a ZD30 motor but there should be some sort of aluminium crossover tube from the turbo to the intercooler which should be able to be removed. This tube will need to be drilled and tapped to accept a thread (normally 1/8" or 1/4" BSPT "British Standard Pipe Tapered" thread) There is usually a fitting supplied by the gauge manufacturer which determines the correct thread to be tapped.
If you're unsure of doing it yourself, get a local mechanic to fit it for you, it shouldn't be too expensive as it's a pretty simple job.
If you are blowing hoses of your ZD30 I wouldn't be surprised if you are experiencing the overboosting that others on this forum are talking about.
On the subject of gauges, if you could afford one an EGT (Exhaust Gas Temperature) gauge is a very useful addition. It allows you to monitor just how hard your engine is working, particularly on climbing hills. If your EGT temps are too high it may be time to change down a gear or use less throttle input. Ian from Thermoguard sells them from this site and a few people have bought them and are happy with them.
I believe an EGT gauge is probably the best diesel diagnostic tool you can get.
Regards Andrew.

Thanks Andrew. Yes, we have the EGT gauge. Haven't done much towing since it was fitted. This "thread line" has been continued at post 28079. Thank goodness people on this forum know so much - Nissan dealers seem to know nothing about the product they sell. Motherhen