I'm struggling to diagnose and fix an increasingly frustrating - and expensive - idle issue. So far I've replaced both lamda sensors, and the MAF sensor, as well as cleaning the idle control valve. A diagnostic check has thrown up two fault codes:
(155) 9B MSS50 Control Unit Fault, fault memory, master
(156) 9C MSS50 Control unit fault (fault memory, slave).
It's got my indy stumped, and he spoke with a couple of other specialists who haven't heard of this fault before. Apparently the car is overfuelling, though the obvious symptoms are terrible hunting at idle (all the way up to 2,000rpm, before dropping right down and occassionally stalling).
Apparently there aren't any air leaks in the system and the cap is in place at the T junction in the airbox.
Any ideas please? Getting rather desperate (and broke!)
(155) 9B MSS50 Control Unit Fault, fault memory, master
(156) 9C MSS50 Control unit fault (fault memory, slave).
It's got my indy stumped, and he spoke with a couple of other specialists who haven't heard of this fault before. Apparently the car is overfuelling, though the obvious symptoms are terrible hunting at idle (all the way up to 2,000rpm, before dropping right down and occassionally stalling).
Apparently there aren't any air leaks in the system and the cap is in place at the T junction in the airbox.
Any ideas please? Getting rather desperate (and broke!)
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