MK7 2.2 100 T280 fwd starts, revs 1500 2000 & cuts out

[dangerous brain]

My 2012 mk7 fwd 2.2 tdci had a bit of a wobbly start about 250 miles ago just after I put super diesel in it. It was noticeable enough that to start with I had a moment where I thought that I had put the wrong fuel in. I hadn't so phew with that one.

Roll on a couple of weeks and anotther round trip to Bath from Southampton circa 85 miles each way I was driving locally no symptoms at all. I got in it to start it at the shops after a 20 minute drive so warm basically.

It fired up, ran a bit crap and even with full throttle wouldn't run above 2000 rpm. It then shuddered and cut out. No EML warnings. I tried again and it would turn over fire up and hunt a bit between 1500 rpm and 2000 but no further with full throttle then just cut out. After that it cranked but wouldn't start despite letting it crank on the starter until it timed out. Weirdly 2 or 3 attempts like that and the amber gear light came up as did the ABS light randomly.

I tried cycling the ignition without starting 4-5 times and it would fire and repeat that hunting thing until it cut out. Rinse and repeat the same issue. I checked the water drain on the bottom of the fuel filter and it drained clear diesel out.

My partner dropped me down my forscan laptop but it didnt find any codes apart from the ABS one that I cleared.

Towed it home and tried pull starting it a couple of times to no avail. Tried a couple of days on the trot from cold and there is no change.

I see that you can check the fuel pressure and other things in Forscan but Im not that proficient with it.

From a little reading on here I see SCV and PRV come up alot. I have a 2006 2.4 transit that recently had new denso valves fitted (after some clown outfit put copy parts in it and left it worse than they got it in). Will those valves be compatible or different to my van?

I would appreciate the learned members here dropping some suggestions on what to look at before I flatten the batteries

[trnx]

2012 mk7 fwd 2.2 tdci. Possibly the same set up as the RWD.

No SCV or PRV.

RWD.
Siemens continental fuel system. On HP pump temp' sensor, pressure reg'.
E5 exhaust. DPF vaporisor fuel pump, EGR, EGR cooler, catalytic.
Above the HP pump is a schrader valve to vent the fuel system.

Forscan - LIVE DATA. can see HP pump fuel pressure. Needs setting up to see what you want to see.
SY Diagnostics youtube info'. Forscan info', Forscan forum.
O Riley DPF youtube.

Likely - fuel del' problem. DPF blocked.

[metalworker0]

JUST TO POINT OUT - You should not pull start it ,meaning bump i suppose .. this is not good for these engines, the timing chain can jump the sprockets, especially on an engine with some mileage on it .

the rest will leave to the experts here, who can give better answers . they will be along shortly maybe later tonight.

all the best.mark

[dangerous brain]

Thanks TRNX - would a fuel delivery problem or a blocked DPF not flag up a code? Have to confess didnt even consider the DPF at all.

Mark - thankyou sooo much for the advice, I really didn't know the pull starting ie bumping it under tow was so bad. Glad I didn't do that too much.

So fuel is coming out of the schrader valve with the ignition on, I don't know what kind of pressure its meant to have.
To diagnose the DPF I assume split the exhaust system just in front of the DPF?

[metalworker0]

yeah its a sticky topic here .. right above this post

there are all sorts of reasons why your transit will not start and better people in this forum to answer than i

i say don't go pulling the dpf though .. just wait for a few more replies , because the van would have gone into limp mode and told you so, before you'd get a dpf complete failure.


all the best.mark

[knobby1]

Thanks TRNX - would a fuel delivery problem or a blocked DPF not flag up a code? Have to confess didnt even consider the DPF at all.

Mark - thankyou sooo much for the advice, I really didn't know the pull starting ie bumping it under tow was so bad. Glad I didn't do that too much.

So fuel is coming out of the schrader valve with the ignition on, I don't know what kind of pressure its meant to have.
To diagnose the DPF I assume split the exhaust system just in front of the DPF?

What fault codes, (if any), are you getting..?? You don't have to have a fault light on to have fault codes stored.

Lord Knobrot

[dangerous brain]

Thanks TRNX - would a fuel delivery problem or a blocked DPF not flag up a code? Have to confess didnt even consider the DPF at all.

Mark - thankyou sooo much for the advice, I really didn't know the pull starting ie bumping it under tow was so bad. Glad I didn't do that too much.

So fuel is coming out of the schrader valve with the ignition on, I don't know what kind of pressure its meant to have.
To diagnose the DPF I assume split the exhaust system just in front of the DPF?

What fault codes, (if any), are you getting..?? You don't have to have a fault light on to have fault codes stored.

Lord Knobrot

No codes at all either in Forscan or a generic code reader program.

[dangerous brain]

So do I swap out the SCV and PRV and see what happens?

[trnx]

So do I swap out the SCV and PRV and see what happens?

My 2012 mk7 fwd 2.2 tdci
Does not have SCV PRV.

[dangerous brain]

So do I swap out the SCV and PRV and see what happens?

My 2012 mk7 fwd 2.2 tdci
Does not have SCV PRV.

There's been a break in the rain long enough to go and look under the bonnet. Mine also doesn't have SCV PRV. It has got a valve plugged into the end of the fuel rail though.

How loud is the lifter pump from the tank meant to be as Im really not hearing alot of noise from that.

How do you get the fuel filter off? Theres a big plastic ribbed bowl thing there which guaranteed I will break if I try taking it off incorrectly.

Is there anything I can check or do I bite the bullet and get it towed to a garage?

[dangerous brain]

Oh and the laat time it experienced starting problems a little bit like this the crash switch had gone off but that looks depressed now - could the actual switch just become faulty?

[dangerous brain]

Oh and the laat time it experienced starting problems a little bit like this the crash switch had gone off but that looks depressed now - could the actual switch just become faulty?

Well its not the switch - i took that out and tested it.

[metalworker0]

How do you get the fuel filter off? Theres a big plastic ribbed bowl thing there which guaranteed I will break if I try taking it off incorrectly.

There is a tool for it, search ebay with the words:
transit 2.2 fuel filter tool

There used to be another completely different design last time i looked 12 months back .. non of that type on there now, just one design - the circular thing with a hole in it and slots for the ribs, comes with lever that slots into it.


all the best.mark

[trnx]

So do I swap out the SCV and PRV and see what happens?

My 2012 mk7 fwd 2.2 tdci
Does not have SCV PRV.

There's been a break in the rain long enough to go and look under the bonnet. Mine also doesn't have SCV PRV. It has got a valve plugged into the end of the fuel rail though.

How loud is the lifter pump from the tank meant to be as Im really not hearing alot of noise from that.

How do you get the fuel filter off? Theres a big plastic ribbed bowl thing there which guaranteed I will break if I try taking it off incorrectly.

Is there anything I can check or do I bite the bullet and get it towed to a garage?

My 2012 mk7 fwd 2.2 tdci -- From your first post!

How loud is the lifter pump from the tank meant to be as Im really not hearing alot of noise from that.
The pump is inside the tank - there very little noise heard from it.

Mine also doesn't have SCV PRV. It has got a valve plugged into the end of the fuel rail though.
It is a sensor - the fuel pressure control is on the HP pump.


How do you get the fuel filter off? Better to do as suggested. They can be got off without the spc tool.

[dangerous brain]

Well I have changed the fuel filter, the diesel in the bowl had quite a bit of black particulates in it. Refilled the bowl with clean fuel from my diesel heater tank, put it all back together and bled it at the schrader and by cracking the injector pipes off.
After quite a bit of cranking it fires up with full throttle only and revs to just over 500 rpm and cuts out after a few seconds of labouring. Now there's lots of smoke as well.

This is not boding well at all.