Rover MG ZR 1.4 'pinking'

[daemon]

My son has an MG ZR and its 'pinking' quite badly, to the point whereby its quite undriveable.

I had the car to my mechanic yesterday and they replaced the plugs, no change, so they replaced both coil packs. That seemed to cure the problem, but today the problem is back.

No water in the oil, and no oil in the water and the engine otherwise seems fine.

Anyone got any ideas?

[pk500]

crank sensor

[daemon]

pk500 said:

crank sensor

Ok thanks. i just googled that and is it enough to clean it, or do they generally need replaced?

[davepoth]

Clean it first, if that fixes it, brilliant.

[daemon]

davepoth said:

Clean it first, if that fixes it, brilliant.

)
OK, cheers. Didnt know if cleaning it was a possibility. will have a look