STR problems

[farmersSTR]

Nissan looked at all the electrics.Voltage,continuity.No bridging found.
They checked most of the fuel system including the inj return.They conducted a pressure test.The filter,primer were found to not leak air.They found no airated fuel apart from small amount of air bubbles which was quite normal.
He was unsure of the fuel tank valve and is looking into it.His opinion is that other symptoms would be present if there was a faulty fuel pump.
Replacing the fuel pump is the last resort as far as the nissan problem solving flow chart is concerned.
So I guess I just have to "suck it and see "

[Tweak'e]

Originally Posted by Martin from Downunder

Does the D22 engine have a learning curve preset like the D40 has?

they are a learning ECU. either reset the data with the code reader or disconnect battery for a while for it to reset back to default.
"learning curve preset" is an interesting term

Originally Posted by farmersSTR

They conducted a pressure test.The filter,primer were found to not leak air.They found no airated fuel apart from small amount of air bubbles which was quite normal.......

i hope they do know that putting pressure on the lines makes the leaks seal shut therefore they won't leak. however put them under vacuum and they will leak. pressure test will only find it if its pissing fuel out. it won't find a small leak which is sucking air in.

fuel tank valve is easy to check. either pull it out (its on top of tank) or simply put a bit of hose on the end of the tank breather line (its is in the engine bay), take fuel cap off and then blow down the breather line. if you can blow down it its fine (assuming no leaks in the breather line).

[Martin from Downunder]

so you like my term do you

I do agree with you they should have vacuumed the lines and check for air leaks simple job at best

When the engine cuts out etc , have you looked at a bogas fuse at all, might be worth replacing the fuel cut off valve fuse just in case it open circuits when it gets hot under load

[farmersSTR]

The fuel tank breather is fine.
What is the little thingy thats on the right hand side of the transfer case.Looks like a cigarette lighter(in car one)Has 2 wires coming from out of the end rubber cap going to 2 electrical connections.This thing is a tad oily.
Qutes today for new pump 4500 buckss

[Tweak'e]

utes parked in the mud at the mo so bugger if i'm going to get under it and look

at the rear should be speed sensor, top of gearbox by the stick i think is neutral and reverse. the other one on the gearbox should be 4x4 switch.

have they tried the ECU ? i would try all the cheap stuff first. ecu is easy enough to swap in/out.

i'm still interested in why it takes 4 pumps on the primer. thats an awfull lot of air in the system.

[farmersSTR]

When the engine cuts out etc , have you looked at a bogas fuse at all, might be worth replacing the fuel cut off valve fuse just in case it open circuits when it gets hot under load
Where is the fuel cut off valve fuse located mate?

Yes I too am concerned about pumping the primer that many times.
Rang around 6 injector repair places today.Quotes all similar.Only getting an idea of outlay at this stage.
One guy said if it was injector pump the code would come on all the time.Not intermittantly and there would be other symptoms.This light has not come on at all since I picked up the car.
That little device on the side of the transfer case had quite a lot of oil in it.To me it looks like a sensor and I presume an internal seal is buggered.Wonder if thats created problems.
Anyway the next stage is to take it to a workshop who has a bosch diagnostics machine and see if they can find anything.
According to one opinion today the inj. pump has an ECU in it and this could be playing up due to wet fuel .
I will find out more by Tuesday afternoon.

[Tweak'e]

Originally Posted by farmersSTR

According to one opinion today the inj. pump has an ECU in it and this could be playing up due to wet fuel .

not sure what you mean ...i'm sure diesel fuel is wet

they have an ecu in the top of the pump. the connections can get corroded and if the seal goes water gets in and stuffs it.
however the ECU is also cooled by the fuel. lack of fuel or too much air could stop the cooling, however i would expect it to die rather than intermitant fault.
as its a timing fault there is the timing connections on the side of the pump (i will have to check that). it has a sensor for feedback and an acutor to adjust timing. obviuosly bad connections would stuff that up a bit.
however timing is also operated by internal fuel pressure. if its lacking in fuel pressure due to air leak or fuel restriction then i would assume it would throw timing out. possibly the ecu is at the limit of its adjustment hence the error code.

[farmersSTR]

Thanks for the info.
I am going to painstakingly replace a lot of the rubber fuel lines and clamps if this problem comes back. We will see what the inj pump doctor says on Tues.
What is a MAF and how and why do you do a butterfly mod?

[Tweak'e]

Originally Posted by farmersSTR

What is a MAF and how and why do you do a butterfly mod?

these motors (ZD30) don't have a MAF sensor (mass airflow sensor), only a MAP sensor (boost sensor). the ZD30 in the patrol has a MAF sensor.

butterfly mod, basically disabling emission system. the butterfly valve in the intake is used to help draw EGR into the intake for emission purposes. if you block off EGR it pays to disable the butterfly as it acts as a restriction in the intake which is not very good.

[farmersSTR]

Got car back today from injector specialist.
Firstly he said that 4 or more pumps on the primer was too much and expected no more than 2.
He put car on diagnostics.All fine.Put clear hose on either sideof primer.Fuel coming into primer/filter was completely bubble free.However the fuel going out of primer to injector pump was riddled with air bubbles with a large bubble every 5 seconds.To him this was unsatisfactory and highly likely to be the cause.He took a video of it with his camera phone and I have a copy.There is not doubt that there is excessive air.
Took this evidence to the nissan guy who also took a copy.Tomorrow he is going to see if he can replace the new primer which is only 10 000 km old under parts warranty.Now remember I installed it so basicly that voids a warranty.According to him.
Anyway I got home and decided to look further at this primer.Pulled it off the car and discovered that there may be an o ring absent.I am guessing there should be an o ring on the internal threaded shaft that is part of the primer top bit which inserts into filter cartridge.When I replaced the cartridge last service I only replaced what o rings where present.So from the onset it was missing when I bought the primer complete with filter.I guess .
I never thought about it and the nissan guy must not of checked this during last weeks diagnostics he did .
Anyway if this is the cause, then its better than a $4500 injector pump repair.It's only a $270 dollar o ring
You guys were right.
Something simple.Sucking air .And most likely around ther primer.
Hopefully problem solved.Shall let you know.Thanks for your help.