Posted by Phil Dunmore on September 8, 2011, 5:08 pm
Year of Manufacture *: 2002 Engine Size and Code *: 2.5 VM ( Optional ) ECU Type: Bosch ( Optional ) Scanner Used: Launch(borrowed) ( Optional) Fault Codes: P1130 P1131
2002 CHRYSLER GRAND VOYAGER CRD LX (RG) DIESEL 2499 cc Engine ENJ/ENC (VM) Bosch CP3 common rail.
First a little history. We have serviced this vehicle for some time. In January this year it came in with a significant lack of power, hesitation and occasional stalling. We found a very dirty fuel filter(not overdue) and one injector with excess backleak. Drained the muck, changed the filter, service exchange injector and all was well for more than six months.
This time it sets codes. P1130 fuel rail pressure monitering P1131 fuel pressure regulator valve. Both will clear but reset after a drive under load. It starts promptly and will idle all day. It will rev out freely from idle. Under load it will cut in and out, almost undriveable, stalls easily. Once this stage has been reached it will not restart unless key is cycled fully off. Then it will restart promptly and repeat above.
We have eliminated the filter and lift pump(only used to prime) by running directly from seperate tank, feed & return.
Removed on pump lift pump to check for broken drive, ok.
Replaced regulator, genuine Bosch, revised part number checked with two suppliers.
'Scoped pressure sensor. Pressure rises suddenly then falls at a slower but steep rate. At point of rise engine knocks. Will often recover pressure and repeat cycle, sometimes stalls.
Fresh out of ideas and thoroughly jarred off, going on holiday for a week to forget about it.
Can you post scope images of pressure verses regulator duty during engine stop, start, rev and then stopped so we can see maybe whats going on? Dont you just love our job somtimes
Don't have the facility to transfer 'scope images to PC yet, saving for Pico
Finally managed to repeat fault with vehicle stationary. Fuel pressure went so high mechanical relief valve in rail operated. Quite a violent event, suprised leak off pipes take it. Moving loom near geabox triggered the event. Cycle key, restart and all was well. Repeat three times. This justified pulling the loom out. Found a small rub on one wire of one injector twisted pair. Repaired and all is well.
on September 9, 2011, 8:06 am, in reply to "
