4jx1 injector

[earlchao]

Hi. My 99 bighorn has engine misfire problem recently. Sent it to Holden at Manukau and they found 1 of 4 injectors is faulty. Unfortunately they cannot pinpoint which one. The solution is to replace them all at cost of $2900 for new injectors plus addition labor charge. Furthermore they only sell 4 as a package.

My questions are: Does anyone know where to get 1 or 2 new injectors in New Zealand? I tried Bits for Isuzu at Auckland and they said no secondhand stocks due to strong demand. If you are a 4jx1 owner, do you know any diesel specialist who has experienced dealing with 4jx1 engine in Auckland area?

At the end of the day, I think I probably will end up paying for 4 new injectors and keeping 4 used injectors in my pocket. Maybe I will put them for sale here.

The other thing is I bought a Bighorn repair manual (CD version) from Ebay that covers 6vd1/6ve1/4jg2/4jx1 engines from 1998 to 2002. It is worthy a look if you are interested in it. search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQfsooZ1QQfsopZ1QQsassZtenbylee

Cheers!

[Roger]

Get other prices to see if you're getting ripped off. Dealers always add that little bit (a lot!) extra than normal.

[earlchao]

Thanks Roger.

Just update my story for the recored.

Talked to my dealer again today and got a better offer. Meanwhile last week talked to some diesel specialist in AKL, they are frank that there is nothing they can do. But I appreciate their attitude.

In addition, there are heaps of 4jx1 information on www.itocuk.co.uk. A guy, Markyboy, who is an Isuzu technician spoke a lot. Those really help!

[earlchao]

Dear friends,

Guess what happen after 4 brand new injectors were installed in my 4jx1 engine.

You are right! Intermittent engine surge is still there.

The Holden technician scratched his head and ...... So the old injectors is most probably not the trouble maker. Now I have 2 sets of ok injectors in my hand. A very expensive toy!

The story is not ended yet. It seems that‚hpintpoint the problem by myself today. Of couse, by sheer luck. I will come back to let you know before I am definitely sure of the cause.

It is amusing? Isn't it? I must say Holden's mechanics have really been struggling to sort it out. The issue is this engine is a super lemon and should not be here.

I enjoy time with my car when it is running ok. But anything wrong, even a minor one, could cost you a fourtune at Holden's service department.

Hope you enjoy your reading here!

[geeves]

2 possible easy causes for this -1 what grade of oil are you using I have been led to belive the handbook is wrong and that you should use 5w30 oil otherwise cold running is an issue Some cars wont even start on a cold morning with normal weight oil. 2 There is a second filter on the left hand side of the motor that supplies oil at very high pressure to the injectors that is suposed to last the life of the engine Changing this might help (its a normal filter so not expensive) Some people now change this every 20000. If its not these then the causes get hard and expensive Good luck

[CraigO]

Hi Earl

Did the Holden techo mention anything about O-rings? The rings let engine oil into the cylinder which causes the surging. If left this will kill the engine. It believe Holden in Oz had problems ie repairs under warranty.

This is a known fault with this engine and is listed on the Japanese version of the Isuzu web site. This fault I think is meant to happen somewhere around the 100k mark so I guess at 57k this is very bad luck, your engine has had a hard life, or the wagon has been clocked?

Craig

[geeves]

do a google search on "4jx1" there is a huge amount in the web for these engines. A lot of it points to a bad engine but in reality these are a good motor as long as the injector oring problem is fixed (this was a recal in Japan and Holden did a recal on NZ new ones only) and they are religiously maintained. ie always use good oil never skip changes etc.
The oring problem can cause oil to get into the combustion causing surgeing but the real problem is diesel getting into the oil which scours the bores and bearings.

[Roscoe]

Hiya, Im a newbie here but also a qualified Diesel Mechanic.

Im not experienced with the new common rail motors but re the 4JX1 engine, If the sleeve seals leak then diesel is allowed into the sump, this causes the level to rise and diesel vapor is mixed with the normal oil vapor and , in turn, makes it more flammable, because it has positive crank case ventilation, the vapor is sucked out by the turbo via the air intake from the filter. This more volatile vapor mix is enough to create combustion without the normal fuel injection and can cause a run away engine.

As it turned out , mine was updated prior to shipping from japan so I was lucky.

The 4JX1 engine should only have a 5w40 synthetic oil in it because the oil is used to pulse the injectors at 4,000 psi (oil pressure) and this must be reached on the starter before the engine will fire.

Other oils will work but you may get hard starting when cold and I figure that this is a bloody expensive engine so to me, the oil is cheap.

Cheers