I had the same problems. The fuel quantity thingy was failing in the FIP. If I came off cruise I used to see a momentary yellow engine light on the dash.
The only way to cure the smoke was to use manual override on the auto gearbox as high revs stopped the smoking. I got a replacement engine in the end, it was cheaper than getting the FIP reburbished.

I removed the turbo and had it checked. I replaced all the turbo pipes - they were fine. MAF sensor was reading out of range. Engine intake temps were stupid (I can't remember exactly but it was like -300C). I had the FIP o rings and seals all replaced. Nothing made any difference. Which is why I went for a full replacement engine. All been fine since :-D

MAF sensor on the diesel has nothing to do with how the engine runs. It is for EGR control and nothing else. The inlet air temp is a preset in the ECM. However one that has failed altogether can effect the ECMs perception of air conditions. Because it is not getting signals it expects to see and gets confused.
 
Yea, I reckon the FIP/chain is shot on mine, cba with replacing the engine for a diesel though when I have a 4.6 that probably needs one already :D
Hoping it lasts long enough for me to get the 4.6 running and then it won't matter, haha
 

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