Thread: 2.4 Puma - Possible Injector Problem

It is turning into a common issue here with the VCV (Volume Control Valve) failing giving the symptoms that you describe. The main issue is that it does not generate a DTC to allow you to focus in on the fault and after replacing fuel filters, accelerator pedals etc with no change in the issue replacing the VCV cured the issue. If you replace the VCV you will need to carry out a pump learn with a diagnostic tool after fitting the new part.

HTH Brian.

@ Keath, The Nanocom Evo mark 1 allows you to disable each injector in turn for fault finding

Originally Posted by Lorryman100

It is turning into a common issue here with the VCV (Volume Control Valve) failing giving the symptoms that you describe. The main issue is that it does not generate a DTC to allow you to focus in on the fault and after replacing fuel filters, accelerator pedals etc with no change in the issue replacing the VCV cured the issue. If you replace the VCV you will need to carry out a pump learn with a diagnostic tool after fitting the new part.

HTH Brian.

Thank you for that Brian.

It sounds as if it could well be the SCV (is this the same as VCV?), I will have to take it back to the mechanic to investigate. I have read that a method to test the SCV is to measure the actual rail pressure and compare it to the target rail pressure (does anyone know the target pressure?) and if there is approx a 1000psi difference, something is up.

Just from reading more about the issue, it seems as if the following could be wrong:

- Suction Control Valve
- Fuel Rail Pressure Sensor (is this obvious by removing and inspecting?)
- Fuel Rail Pressure Relief Valve (apparently obvious if failed)

And I would like a nanocom down the track, but issues like this seem to be eating up any potential chance of affording one!

Originally Posted by Keath

Thank you for that Brian.

It sounds as if it could well be the SCV (is this the same as VCV?), I will have to take it back to the mechanic to investigate. I have read that a method to test the SCV is to measure the actual rail pressure and compare it to the target rail pressure (does anyone know the target pressure?) and if there is approx a 1000psi difference, something is up.

Just from reading more about the issue, it seems as if the following could be wrong:

- Suction Control Valve
- Fuel Rail Pressure Sensor (is this obvious by removing and inspecting?)
- Fuel Rail Pressure Relief Valve (apparently obvious if failed)

And I would like a nanocom down the track, but issues like this seem to be eating up any potential chance of affording one!

SCV, VCV and PCV are all the same thing.

PRV often goes in combo with the SCV in the Transits but in the Pumas not so much? My theory is that the dodgy SCV leads to a pressure spike in the rail in Transits but leads to a pressure drop in the Pumas - maybe due to different fuel programs?

PRV will come out in bits if it's blown. A good and a failed SCV look identical to my eye. I don't believe the sensors are a frequent cause of any issues, based on my research.

I'd consider replacing the SCV if I were you.

PS Lorryamn is right about the lack of DTCs.

Originally Posted by Keath

Yes mine only really became prevalent with the colder weather.

How many clicks are you up to?

Mine has done 206,000km.
My Nanocom has failed and is in a box about to head back to Cyprus for repair so I'm not able to investigate fault codes at present. Will have to do some research on this PCV, my knowledge of the electronics on the common-rail system is poor.

Did a little reading and the SCV could well be the cause of the symptoms that my 2.4 displays. Has anyone replaced this and can tell me the approximate cost? Also was looking for info on where it is located on the Puma engine, if anyone has a photo that would be great.
I have zero confidence in the dealer mechanics to correctly diagnose these systems. If anyone can recommend a knowledgeable diesel specialist in Gippsland or eastern Melbourne, please do so. I would like to get someone to give my whole system a good going over, but there is no-one that I know of to whom I would entrust this.

Originally Posted by POD

Did a little reading and the SCV could well be the cause of the symptoms that my 2.4 displays. Has anyone replaced this and can tell me the approximate cost? Also was looking for info on where it is located on the Puma engine, if anyone has a photo that would be great.
I have zero confidence in the dealer mechanics to correctly diagnose these systems. If anyone can recommend a knowledgeable diesel specialist in Gippsland or eastern Melbourne, please do so. I would like to get someone to give my whole system a good going over, but there is no-one that I know of to whom I would entrust this.

Sounds like we are in a similar position.

Mine is going into the mechanic on Monday to get the rail pressure read, and if it's wrong, i'll get the SCV replaced.

I have a workshop manual, and despite the SCV being mentioned extensively in the diagnostic charts, there is no removal procedures i can find. However i can find one for the 'fuel metering valve' I assume this is the same thing.

I have extracted this section and attached it to this post.

I will need to confirm if my mechanic has the tool to do a fuel pump re-learn after the installation.

Listening with much interest!
My 08 Puma has just started displaying the exact symptoms at 100,000k's.
Intermittent throttle response loss and idle hunting.