L322 2004 BMW ENGINE TD6 Lacking in power when cold.

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wampa

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portsmouth
Hi Guys/Girls can any one help?

Td6 l322 range rover it's lacking power/limp mode when cold had no fault codes Disconnect MAF it runs like a dream, so swapped it out, but its the same with new one, unplug it runs fine but I now have fault for low side rail pressure. Smoked it for boost leaks,no probs, checked live data fuel pressure seems good but maf is reading 660 but asking for 440. Could this be a faulty maf or is there something I'm overlooking? have fitted new fuel filter but made no difference. I now have code p1260 Replaced battery and the low pressure external pump but still the same any clues live data shows fuel pressure fine on high and low side I'm at a loss on this any help please

Thanks
 
I think they have he same as the x5 with the secondary pump, a friend on mine had similar issues with his x5 and turned out to be the second pump at fault. When it was replaced it went like a rocket.
 
Thanks guys your amazing, Fitted a new Map Sensor today, and it runs lovely, try it out over the next few days, see if thats it.
 
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