Air flow metre.
wastegate actuator arm sticking
Move OK when last tested, could it just be sticking a bit?
Still playing up wastegate modulator is on list to replace.
But had the issue today below 4000rpm for the first time.
All intake sensors cleaned, wastegate arm is free. New fuel filter.
I have a brand new modulator for sale £15 +postage if your interested
Just did my modulator and found that 2 of the 3 vacuum pipes that go to it were split/holed.
Replaced pipes, but bore of new pies are bit bigger than original, so still a bit of a problem there. Will source correct bore pipe and presume problem will entirely disappear then, as it did for about 20 minutes when I bodged the original pipes with tape to get me to the shops.
So why was that? Map error or duff memory location? If it was an error in the map, had it been remapped before?
Just noticed the dates on this thread!
Did this really take two years to resolve