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Oil Rail Pressure Sensor Valve Rebuilding for 4JX1 engine.

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Hello,

A common problem i have experienced over 3 models with this engine whilst in my ownership has been this part that caused erratic running after a while (hesitation in acceleration and lumpy operation at steady throttle). I needlessly spent money replacing the wiring loom and other parts when it was finally traced to this.

Whilst in Thailand I took the liberty of going to an Isuzu dealership and purchasing what was the last part of this type in existence according to dealers database. If so I feel sorry for all other 4JX1 owners as this part will playup/fail in time and the vehicle will be a ###### to drive. I paid 8,150 Thai Baht for it which equated to AUD$271 where at the Holden dealer down here they quoted me $650 for parts that were in stock. Just a rip off for us long suffering Jackeroo owners. I would have purchased all their stock if they had more and sold it on EBay locally at even half the dealer price..

The Part number is 8-97174872-0 Valve : Rail Pressure Sensor as read off the carton the part it comes in. And guess what? It says Made in USA on the carton! Can you believe that? But it has Isuzu Motors Limited Japan genuine part written as well.

Now anyone who may know more about this componant in the mechanical field, this part is a very simple looking piece of gadgetry. What can wrong with it to cause the erratic running where I think it sends the wrong data to the ECU not allowing the correct fuel injection volumes to be sprayed into the motor.
It has this plunger type thing inside where you can push it down with a pen. Can they be dismantled and cleaned out? What can wear inside? Do they get ingested with diesel soot where the parts are prevented from functioning? Can we let it soak in solvent for a week?

I have an old one from a previuos model and the brand new in the box that will need to go into our 2002 as this vehicle has the same symptoms in the last few thousand KM's as the past ones. I feel that this may become a critical issue for owners as due to the absence of this part the entire vehicle may need to be scrapped due to it becoming undrivable.
A great 4WD where all it needed to be continued in the marketplace was a simple engine change to a 4JJ1.

Alex.

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