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MK7 2.2 FWD T350 Rising fuel pressure ?

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MK7 2.2 FWD T350 Rising fuel pressure ?

Postby Huxley » Sun Jul 16, 2017 10:40 pm

Anyone experienced a similar issue?

Current problem with my 150,000 miles transit MK7 2.2 FWD T350 Rising fuel pressure.

Vehicle starts ok but will intermittently run rough and not rev! Every time this happens my digital 'miles to empty' display flashes with four flat lines (----) and sometimes the cog warning light comes on. However no fault code is stored !

When a laptop is plugged into the OBD I can see using live data that the fuel rail pressure, while the above symptoms are happening, rises off the scale until you accelerate at which point the pressure drops dramatically (if it revs) and the digital display returns to normal.

Any ideas? The problem I have is this is not all the time and will drive for a hundred miles and be fine then will play up.... Its dangerous!

Thanks for your time, I will change the PRV tomorrow as a precaution!
Huxley
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Re: MK7 2.2 FWD T350 Rising fuel pressure ?

Postby Huxley » Mon Jul 17, 2017 11:06 am

Added info!

57 plate 2008 vehicle.

On tick over the fuel rail pressure should be 23MPA, however when the fault happens on tick over watching the live data via laptop it rises to 90MPA, then when you rev it drops to 23MPA.... Stop revving then it rises again! Every time this fault occurs then the digital 'miles to empty' display changes from digits to ---- and flashes, sometimes the orange cog light illuminates also.

Annoyingly sometimes it wont rev either and I have to stop and restart the vehicle.

I am changing the PRV and pressure sensor in rail later today. The Fuel Metering Valve and Pump Learn was done last Thursday!

I will also be volt dropping the battery, vehicle and engine earths today to check all is ok there.

Really interested to know if anyone has these issues currently and like me are scratching there heads or if indeed have had these issues and have successfully repaired it permanently.

Thanks
Huxley
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Re: MK7 2.2 FWD T350 Rising fuel pressure ?

Postby Huxley » Mon Jul 17, 2017 8:36 pm

Todays update!

Removed PRV which was in pieces, replaced with new ford part. Made no difference sadly but at least it needed replacing.

Went to local ford van centre and spoke to a 'mastertech' whom advised van probably needs a software update. I have booked in for Friday morning at Ford and will have the software update done anyway as it may help to compensate with any ware on the engine, I am not confident this will cure the fault tho the 'mastertech' seemed sure.

I had also spoken to another transit guru that suggested the problem is more likely with the body control module or at least a fault between the ECU and BCM, either wiring chaffed or plug loose to the BCM. Had a quick look tho nothing obvious.

This is frustrating to say the least....
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Re: MK7 2.2 FWD T350 Rising fuel pressure ?

Postby Back probe » Tue Jul 18, 2017 10:26 pm

Strange one, I would of expected this fault to have been cured by the parts you've had replaced. I'd be surprised if a PCM update fixes this, or if it's BCM fault. Might be worth checking the readings at the fuel rail pressure sensor with a meter.
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Re: MK7 2.2 FWD T350 Rising fuel pressure ?

Postby Jim Archer » Wed Jul 19, 2017 7:48 am

Reckon you want to be looking at the inlet metering side of things, seeing as that is what normally governs the rail pressure.

Jim
All that noise is the sound of reliabilty.
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Re: MK7 2.2 FWD T350 Rising fuel pressure ?

Postby knobby1 » Wed Jul 19, 2017 10:07 am

What Jim said...

If you're PRV was in pieces, it will probably be a faulty SCV which has caused it, just replacing the PRV probably won't help much....best to replace both valves and do all the relevant learns. Always use genuine Ford items too, we've had all sorts of grief using non-genuine ones, some work some don't.

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2008 2.4L RWD 170+PS 6-speed 350 LWB High Roof.

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