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2011 FWD Ford Transit Mk7 SCV replaced got problems!

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2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Pro-Active » Fri Jun 09, 2023 6:44 am

Had the SCV replaced yesterday and fuel rail high pressure sensor, but not the PCV due to wrong part I order them on ebay but they were Denso parts could this be a problem of counterfeit goods? the garage told me there did all the pump & injector learns but runs like crap with the powertrain light flickering now & then with a lack of power now. Reason why I change the parts had a intermittent rough idle. Garage told me it could be the diesel injectors that could be the problem now, was running fine before driving to the garage, should of left it alone? Any ideas Gentlemen, I lack confidence in the garage and going elsewhere to solve the issue the van has done 175,000 I reckon its still got the original diesel injectors.

Look forward to any advice in advance just to get some heads up
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Re: front suspension

Postby Airthies » Fri Jun 09, 2023 6:52 am

Generally.... Never change the pressure sensor.
They rarely go wrong and you usually wreck the original removing them.

No point changing PRV if your not changing SCV.

Get genuine parts from a reputable diesel specialist.

Carry out an injector leak off test, though if any are beyond limits and failing it will often fail the learns.


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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Pro-Active » Fri Jun 09, 2023 7:00 am

Thank you for the reply, the old PCV was removed and put back on the fuel rail could this be the problem, will get a leak off test done
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Pro-Active » Fri Jun 09, 2023 9:11 am

Just wondering what are the symptoms of a faulty/failed PRV? would it flag up the powertrain light?
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Burn2 » Fri Jun 09, 2023 10:46 am

Hello, i never found any defective PRV at the time.

I think that if there is a problem with it it could turn on the powertrain light has it's a critical electric sensor.
Are you sure that the connector is well plugged inside?
Does the powertrain led was here before the intervention?
I think that with a bad PRV, all should be erratic or it will not turn as it does not know how much fuel it have.
I wonder if the fuel heat sensor is in the PRV too or if it's an other sensor?

Normally for the fuel you got 3 part:
SCV
Boost pressure valve (a valve that limit the pressure to 1600bar sop it's just there to release full if pressure is more then 1600 bar)
PRV (the sensor that read the pressure)

It's often the SCV that is wrong, or sometime the Boost pressure valve (but it's easy to test to see if this valve is ok).
On mine my mecanic has change the SCV alone and the rought idle is done.



Has always, DTC code reader is usefull to know what turn on the light. ;)

Normally with injector problem you could not do the injector learn it will fail during the procedure.
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby knobby1 » Fri Jun 09, 2023 9:24 pm

Pro-Active wrote:Thank you for the reply, the old PCV was removed and put back on the fuel rail could this be the problem, will get a leak off test done


PCV..?? I think you mean PRV as they don't have a PCV, (Positive Crankcase Ventilation Valve). If the PRV has completely failed, the engine will never start.

If you bought the valves from Ebay, chances are they're not genuine Denso and just cheap knock-offs. Genuine valves are quite expensive.

If the powertrain light is coming on, you probably still have fault codes stored.

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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Pro-Active » Fri Jun 09, 2023 9:56 pm

The van does start but alot of diesel knock when starting to accelerate it quiten down but feels like a bit of lack of power was fine before the parts were replaced, as mentioned before the old PRV was taken off the fuel rail and put back on due to new one being the wrong one, would this cause an issue?
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby knobby1 » Fri Jun 09, 2023 10:19 pm

Pro-Active wrote:as mentioned before the old PRV was taken off the fuel rail and put back on due to new one being the wrong one, would this cause an issue?


Pop the return line off the rear of the PRV, run the engine at idle, if there's any fuel coming out of the valve, it's not well. It can be wet but no dripping or flow. The PRV is just a relief valve, nothing else, it's sole purpose is to protect the rest of the fuel system from over pressure damage.

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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Pro-Active » Fri Jun 09, 2023 10:25 pm

Thanks will check, if it is dripping would this affect the running and performance of the van?
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby knobby1 » Sat Jun 10, 2023 4:16 am

Pro-Active wrote:Thanks will check, if it is dripping would this affect the running and performance of the van?


Yes.

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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby marcrbarker » Sat Jun 10, 2023 10:41 am

Pop the return line off the rear of the PRV, run the engine at idle, if there's any fuel coming out of the valve, it's not well.

just to add something 'it' = the system, not necessarily the PRV itself, don't shoot the messenger for delivering bad news!

The PRV is just a relief valve, nothing else, it's sole purpose is to protect the rest of the fuel system from over pressure damage.


A true anectdote... Central heating system the pressure relief valve kept failing, replaced by CORGI
each time, baffled why it would fail because they had a history of low mains water pressure. Turned out one of the teenagers in the family would open the 'add water pressure valve' and then leave it open. Then during the night the mains water pressure would peak enough to open the relief valve, then metal rust particles circulating in the water got into the valve seat, maintaind the valve slightly open. Even after was shut the open 'fill pressure valve'. Result the slow dripping through valve got worse and worse and then valve failed.
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Pro-Active » Sat Jun 10, 2023 2:45 pm

If the leakoff test is bad news should I get high quality new injectors or high quality refurbished ones plan to replace all 4 instead of one at a time m. What am I looking at regarding the parts & labour cost, I expected I will be crying in my pint or two of cider.
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Airthies » Sat Jun 10, 2023 2:50 pm

marcrbarker wrote:
A true anectdote... Central heating system the pressure relief valve kept failing, replaced by CORGI
each time, baffled why it would fail because they had a history of low mains water pressure. Turned out one of the teenagers in the family would open the 'add water pressure valve' and then leave it open. Then during the night the mains water pressure would peak enough to open the relief valve, then metal rust particles circulating in the water got into the valve seat, maintaind the valve slightly open. Even after was shut the open 'fill pressure valve'. Result the slow dripping through valve got worse and worse and then valve failed.


That's why you're told everywhere on this forum and many other places to replace the SCV (suction control valve) along with the PRV (pressure relief valve).

The reason for the PRV failing is usually caused by a failing or failed SCV

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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby marcrbarker » Sat Jun 10, 2023 3:15 pm

Airthies wrote: replace the SCV (suction control valve) along with the PRV (pressure relief valve).
The reason for the PRV failing is usually caused by a failing or failed SCV

Question... what is a failed/failing SCV doing that makes the PRV fail? And what's happening to the PRV that makes it fail?
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Re: 2011 FWD Ford Transit Mk7 SCV replaced got problems!

Postby Airthies » Sat Jun 10, 2023 3:36 pm

marcrbarker wrote:
Airthies wrote: replace the SCV (suction control valve) along with the PRV (pressure relief valve).
The reason for the PRV failing is usually caused by a failing or failed SCV

Question... what is a failed/failing SCV doing that makes the PRV fail? And what's happening to the PRV that makes it fail?
Exactly as happened in your true anecdote.

The SCV not regulating pressure correctly forces the PRV to be opened repeatedly.

Though in this scenario it is wearing out the PRV therefore causing more work for SCV and so the cycle is perpetuated.

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