Thread: Petrol in a diesel ford rager

Originally Posted by norsk

Does the system hold pressure between the injectors and the pump indefinitely? Not pressure up prior to starting?

Nope, engine stop is achieved by the fuel pressure modulation valve (what us not-Bosch mortals call a suction control valve) going to full open and dumping rail pressure back to the tank... This was the critter that stuffed my Ranger up - it was not opening correctly to release pressure off the common rail so that when you hit the top of a hill and throttle off, the common rail pressure was being told to drop back by the ECU (modulation valve commanded to open) but the valve wasn't opening - meaning the commanded pressure and actual pressure were different enough to trigger a limp mode alarm (fuel pressure out of specification).

The vehicle didn't have the usual symptoms of fuel injection failure (the issue I had was too much common rail pressure), which made us look a lot further into it spending a lot of time with a datalogger. Biggest issue is with the datalogger on, it played ball and behaved. Take the datalogger off, and it would trip an alarm and go into limp mode within minutes the stupid Ford thing...

Originally Posted by No.3

stupid Ford

Fixed it for you

Originally Posted by Kiwi Greg

Fixed it for you

A Mazda man hey?

Originally Posted by No.3

A Mazda man hey?

Originally Posted by No.3

A Mazda man hey?

....isn't the latest Mazda sourced from Isuzu?
The whole automotive industry is more incestuous than Alabama

Originally Posted by Nickoli

....isn't the latest Mazda sourced from Isuzu?
The whole automotive industry is more incestuous than Alabama

Yep that would be correct. I hear the latest Amarok is using the Ranger underpinnings as well.

Originally Posted by Nickoli

....isn't the latest Mazda sourced from Isuzu?
The whole automotive industry is more incestuous than Alabama

A bit harsh on ‘bama aren’t you?

Originally Posted by Finnwolf

A bit harsh on ‘bama aren’t you?

....insert whatever inbreeding reference you want....or take whatever offence you want....."that don't bother me none"
FWIW - I've got no ties to anything in the States more than a passing interest; but I do enjoy poking fun at Southern States for inbreeding.

Originally Posted by Nickoli

....isn't the latest Mazda sourced from Isuzu?
The whole automotive industry is more incestuous than Alabama

Yes. Can confirm these 4JJ3 powered Mazdas run on 67% petrol also

Originally Posted by No.3

Nope, engine stop is achieved by the fuel pressure modulation valve (what us not-Bosch mortals call a suction control valve) going to full open and dumping rail pressure back to the tank... This was the critter that stuffed my Ranger up - it was not opening correctly to release pressure off the common rail so that when you hit the top of a hill and throttle off, the common rail pressure was being told to drop back by the ECU (modulation valve commanded to open) but the valve wasn't opening - meaning the commanded pressure and actual pressure were different enough to trigger a limp mode alarm (fuel pressure out of specification).

The vehicle didn't have the usual symptoms of fuel injection failure (the issue I had was too much common rail pressure), which made us look a lot further into it spending a lot of time with a datalogger. Biggest issue is with the datalogger on, it played ball and behaved. Take the datalogger off, and it would trip an alarm and go into limp mode within minutes the stupid Ford thing...

Yeah I didn't think the rail being pressurised all the time sounded right.