Diesel Return Flow Testing - Pressurised Piezo Return

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Diesel Return Flow Testing - Pressurised Piezo Return

Postby STC » Thu Dec 15, 2016 3:05 am

I'm wondering if any one has come across a way to test the pressure between the Injector Leak Off and the Return Flow Pressure Regulator on These Systems. The Bosch system relies on 10 bar pressure applied to the injector leak off circuit for the Injectors to function correctly.

When the regulator breaks down and the pressure drops they cause some weird symptoms.

My issue is that it is not possible to break into and "T" off into a gauge from any of that pipework without damaging it and replacements are stupid money.
Return flow pipe.jpg


This picture shows rubber pipework that could be messed with but some systems do use shrunk plastic pipework.
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Re: Diesel Return Flow Testing - Pressurised Piezo Return

Postby victor2k » Thu Dec 15, 2016 8:39 am

Hello,
For the piezo injectors I see on e-bay this test kit
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Re: Diesel Return Flow Testing - Pressurised Piezo Return

Postby Technician » Thu Dec 15, 2016 10:10 am

The gauge kit can test pressure up to 15 bar.
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Re: Diesel Return Flow Testing - Pressurised Piezo Return

Postby STC » Thu Dec 15, 2016 1:08 pm

Victor

That looks like it could be what I am looking for. I will have to order one and see what comes out of the box.

Thanks
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Re: Diesel Return Flow Testing - Pressurised Piezo Return

Postby STC » Tue Feb 07, 2017 10:29 pm

I have bought this item and it is right for the job.

I have access to an Audi A6 2.7 BPP Engine car that suffered from weird unexplainable issues. We had Idle Issues and silly Exhaust Temp Readings - From a car that was not born with a DPF or any Exhaust Temp Sensors Fitted.

The Parts Cannon had been fired at it - Injectors, Pumps, Rails, FRP, Lambda, EGR Delete, Remapped .... ..... ....

At the time we managed to get a known good running car side by side with it for 2 days to no avail.

It was by pure accident that we damaged the return flow pipe connector and had to replace the Return flow pipework which includes the 10 bar regulator. As if by Magic it was fixed, EGT was no longer fluctuating and the Idle was "Text Book"

Using this tool, I got the car back in and was able to conduct the Return Flow Back Pressure Test in 30 minutes to condemn the old set we took off ( kept safely ) and confirm the new set we fitted.

May help someone one day, hope so !
Last edited by STC on Fri Feb 10, 2017 6:21 am, edited 1 time in total.
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Re: Diesel Return Flow Testing - Pressurised Piezo Return

Postby Dcunning35 » Wed Feb 08, 2017 8:35 pm

Good shout stc .
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