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The car is an Australian delivery model that lives in Australia. Its the same spec as the euro model cars.
When i replaced the plugs recently they were almost black (not with oil thankfully).
I didn't realise it was possible to adjust the fuel mixture on these cars?
The mechanic checked all the vacuum hoses and replaced the hose for the idle control valve as it was cracked.
I think the workshop manual has info about how to diagnose the temp sensors so ill give it a go.
A lot of what i have read seems to point to the MAF. I emailed the guys at JDS porsche and they seemed pretty certain it was the MAF. Makes sense since the car has done 160,000 miles and as far i know the MAF has not had a service. (Apparently they only last 80,000 kms or so).
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