Range Rover P38 diesel injector pump problem

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wammers said:
To far retarded bad hot starts. Static timing is set with .90 mm lift on cam. This gives slight advance for starting, the timing device in the pump is spring loaded so always returns to this setting when engine is cold or has been stopped for a time when hot and internal pressure has bled away. When engine is hot no cold start fuel is set by ECU so a retarded static can give hot starting problems. As the engine speed rises internal pump pressure increases until a pressure relief valve opens and returns fuel to the inlet side of the internal high pressure pump. The ECU receives a point of injection signal from the number four injector and uses this in conjunction with readings from the crank position sensor to modulate the timing solenoid, to control fuel pressure exerted on the timing device so that the point of injection remains at TDC no matter what the pump internal pressure is. Modulation at idle, warm engine, should be around 45% to 55% ideally 50%, the modulation solenoid can then go either way to control pressure on timing device subject to engine RPMs and internal fuel pressure. If the static timing is to far out either way it may not be able do this within it's range of operation, so the ECU will throw a modulation out of range fault.
Click to expand...
Wowsers!

Thanks.
 
welshsteve said:
I had no end of problems with my fip, I could not get it to idle smoothly and also found if I was driving along and came off the accelerator the mil would flash on for a second, when stationary in park if I selected any gear the revs would drop of the car would even stall.
Replaced the pump with a recon unit and it transformed the drive completely, got to say it's the best thing I have done to my car to date.
Click to expand...
...by the way, since tightening the FIP mounting bolts, the 'MIL flashing momentarily when you take foot of the accelerator' thing has stopped too!
 
Sorry for resurrecting this old post, but my problem looks like something of the same.

Have had sudden stuttering while under 2000 Rpm once in a while. Rpm drops suddenly for half a second and straight back to normal .

The other day i started having problem with the idling. The revs drops and oscillates up and down a lot, and it can even stall sometimes.
Connected my nanocom and got the fault message. "Fuel flow value out of range"
As i read your posts I understood that this means the feedback from the servo potensiometer is lost. Is this correct?
Could this lead to the problems i am having?

And where/how do you begin looking for the cause of the problem?`

Regards
Petter
 
Pettur said:
Sorry for resurrecting this old post, but my problem looks like something of the same.

Have had sudden stuttering while under 2000 Rpm once in a while. Rpm drops suddenly for half a second and straight back to normal .

The other day i started having problem with the idling. The revs drops and oscillates up and down a lot, and it can even stall sometimes.
Connected my nanocom and got the fault message. "Fuel flow value out of range"
As i read your posts I understood that this means the feedback from the servo potensiometer is lost. Is this correct?
Could this lead to the problems i am having?

And where/how do you begin looking for the cause of the problem?`

Regards
Petter
Click to expand...

Problem with the fuel quantity servo feedback pot. Recon pump on the cards.
 
Ok thank you for the response.

And what should I check before i can conclude that this is what needs to be done?
As this can be costly, it would be great to be as sure as possible that the problem will be fixed.

P
 
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