motor control failure at 4k rpm - Alfa Romeo Forum
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motor control failure at 4k rpm

the GTA 3.2 runs fine (very well)

but seems to have an intermittent fault.

clears itself after a little while but comes back at a certain point..

before i get it to someone with examiner any ideas.

No symptoms - just 'MCF go to dealer'

4100rpm it flashes up and then if you slow down it goes away. Obviously this only happens on the autobahn or test track in the higher gears.

I'm thinking cam sensor? any ideas before I take it in?
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More likely the CAM sensor, but also (very rare and unlikely) the Cranksensor...
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Thought I'd post an update so others can share.

Right - what I've learnt is that as the cam sensor starts to fail it flashes up mcsf above 4k rpm

This is due to the ecu using the cam sensor as timing for the injectors at speed to get the sequential injection right

Whilst the car fires up using crank sensor if the cam sensor fails (on mine once it's warmed up) when stationary it won't fire up - however if it fails once it's running it will run fine....

Using fiatscan etc it only showed as a misfire on all 6 cylinders - didn't log as cam sensor

So.... If you get these symptoms it's probably cam opposed to crank sensor.

It's also been mentioned to me that the oilseal can give problems on the Cam sensor - leaking fouling contacts and perishing upsetting air gaps - don't know how true but seems reasonable

75 ts track car, 156 GTA Sport Wagon, 159 TI JTD 2.4 Q4 sportwagon (no more), 147 JTDm
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