Hi all,

After resolving a previous issue with 2 new turbos, I again have restricted performance.
This happens on deceleration, not whilst accelerating and triggers the fault code P0107- no other codes appear.
I have checked and replaced the map sensor just once and it seems to be functioning as required.
Checking live data I get 1.3v at idle and 100kPa. It increases with acceleration and I issue up to the limiter.
When decelerating the volts drops to 0.25 and the pressure accordingly.
I do not know what may be causing this. Has anyone had any experience or know where to trouble shoot?

Thanks in advance

What supply voltage are you getting at the MAP sensor? - measure at the sensor wiring across the +ve & -ve, should be in the range of 4.75 - 5.25VDC

Just tested and measuring 4.9v at supply and have continuity at ground.

Is this a 3.6 or a 4.4 TDV8?

Sorry, it’s the 4.4TDV8.

Assuming no intake leaks, blocked air filters, charge air leaks etc. I'd be looking for delaminating hoses creating a restriction on deceleration. As always, a smoke test would be the preferred first step but obviously not everyone can do that.
It would also be worth checking the MAF for contamination or leaks, the correlation between the two readings has to be within a fairly tight envelope.
I've seen a partially oil filled intercooler give similar errors, not on a LR though.

No obvious leaks and I’ve replaced the filters (hoping this was the reason) but not thought about delam pipes!
I have spoken to my friendly garage but they can’t lookalike it for a week and I don’t have smoke test equipment.
I visually checked the MAF and looked ok, but not used leaks.
I’ll focus my effort on looking for a delam.
Thanks for your help!

They usually occur on bends rather than straight-ish sections, look for discolouration on the outside where oil is penetrating and feel for any weaker areas when poked and prodded, an endoscope is invaluable for looking inside for bubbles and tears and can be found quite cheaply on fleabay to connect to your phone or PC. - it will be something simple that's causing it, finding it is the hard part, good luck!

take it down to Steve at T and S Norman in Shepton mallet. What he don't know about the L322 doesn't need knowing. He fixed my RP prob by engineering nouse, after all the LR dealers and specialists failed. pm me for details if you can't find them on t'internet