MK 7 2.2 FWD SCV & PRV learning.

[Samuel86]

Hi.

I have a 2009 Transit MK7 2.2 FWD, It was hunting on idle and always cutting out when idling. After doing some reading here I came to the conclusion that I was happy to take a guess at replacing the SCV, the PRV & the fuel rail pressure sensor. All these parts come as one kit. I've now replaced them all and the hunting has gone, its ticks over nicely and doesn't cut out, however its now blowing more black & grey smoke then before when under heavy acceleration and seems to be down on power.

I haven't done the learns for these components and this is something I don't know how to do. I have a TOPDON AD600 OBD2 Scanner tool that i've been using to read the codes. Currently the engine ecu is without any codes.

Can someone explain to me exactly what the learning process is, could it be done with Forscan ?

I am essentially telling the ECU that is has a new SCV fitted ?

Any help is greatly appreciated.

[knobby1]

Hi.

I have a 2009 Transit MK7 2.2 FWD, It was hunting on idle and always cutting out when idling. After doing some reading here I came to the conclusion that I was happy to take a guess at replacing the SCV, the PRV & the fuel rail pressure sensor. All these parts come as one kit. I've now replaced them all and the hunting has gone, its ticks over nicely and doesn't cut out, however its now blowing more black & grey smoke then before when under heavy acceleration and seems to be down on power.

I haven't done the learns for these components and this is something I don't know how to do. I have a TOPDON AD600 OBD2 Scanner tool that i've been using to read the codes. Currently the engine ecu is without any codes.

Can someone explain to me exactly what the learning process is, could it be done with Forscan ?

I am essentially telling the ECU that is has a new SCV fitted ?

Any help is greatly appreciated.

Were the SCV & PRV genuine Denso or Ford items..?? If not they can often fail the learns and you'll be doing it all again. The genuine fuel rail pressure sensor rarely fails.

The learns can easily be done using Forscan, it's very good and essentially walks you through the process. No, you're not telling the PCM it has a new SCV & PRV, you're basically resetting the fuel system to a datum condition and "tuning it" to run as it should. Fuel system components wear over time and their performace will also change over time. No two fuel pumps, injectors and valves are exactly the same even if they share the same part numbers.....you're essentially tuning the system to itself based on fuel pump pressure, injector flow characteristics etc... The injectors have a 16 digit calibration correction factor which needs to be entered into the PCM....again, no two injectors are exactly the same regarding flows at any given pressure, the learns will also calibrate them to work with the rest of the system.
The learns are basically a service/maintenance procedure, but very few people actually do it as part of or during a service... some people run their engines into the ground and then complain about them being unreliable when they start to fail. Maintenance is the key word.

Lord Knobrot

[Samuel86]

Thanks for your reply and clear explanation.

I've got the USB cable on order, the one recommended by Forscan.

The parts are non genuine so I will order the denso kit .

Can you tell me of any suppliers where to purchase these ?

I will likely be replacing the injectors at some point in the very near future as a couple have blown their seals and the rocker cover is covered in black oil, soot and grime. There are mainly places online (ebay) offering recon injectors that don't appear to be denso. Would you advise me to steer clear of these and only go for denso ? Also can you code injectors using Forscan ??

Your help is really appreciated.

[Samuel86]

Can anyone tell me the service procedure your supposed to carry out after replacing the SCV??

I've attached an image of the screen when I attempted one of the service procedures the other day.

Also I can't seem to register for the FORSCAN Forum, anyone know what the deal is with this ? It says you need a registration code.

[knobby1]

You need to reset the PRV counters, then do the pump learn and then the pilot/injector learns.

Lord Knobrot

[Samuel86]

I have managed to get the learns done! Both pump learn & pilot injector learn have successfully completed. However the PRV counters reset doesn't seem to work. I just get a message saying "Service procedure not supported". I've read into other people having the same problem on Forscan and that it can be a firmware issue that can only be dealt with via a software update through main dealers. I've read this from posts on this forum & Forscan forum.

After completing the learns I've ran the van today, performance is improved slightly but it doesn't pull away like it used to in the past. Engine idles smooth, it starts and fires first time no problem from cold and its currently freezing in the UK! However under acceleration you do hear a typical diesel knock, and the again under acceleration there is what I would class as very high level of grey to black smoke being emitted from the exhaust. There are no faults directly related to any of the injectors nor have I seen in the past. The only fault that keeps occurring is P2265 "water in fuel sensor". This fault always seems to be present after road test.

Because of the smoke from the exhaust I've pulled the turbo intake off. There is wet oil inside the intake but I would put this down oil vapour coming from the breather system, which on a diesel that is 13 years old with 170K on the clock I would expect. Also the turbo shaft is solid and no free play. I'm going to check the compression of all cylinders next, if the results come back as acceptable then I'm putting it down to worn injectors, possibly over fuelling or leaking slightly, causing unburnt fuel in exhaust - grey & black exhaust fumes. If anyone has any other ideas or suggestions on live data I could look at on Forscan for highlighting a possible cause then your help is appreciated.

[Frag]

If it’s black smoking,
Remove the MAP sensor and check it’s not blocked up with carbon,clean and refit.

If you’re going to the length of compression testing it,I would clean out all the inlet tract and manifold if (likely) clogged with carbon,and as much of the ports into the head you can safely access.

[knobby1]

Black smoke is often caused by a split boost pipe/hose.

Lord Knobrot