What's causing my BMW 3 Series to misfire?

I have a BMW 3 Series automatic. Presently, the car misfired on the first start of the day, but clears after five minutes. I’ve replaced two coil packs, injectors, plugs and the high pressure fuel pump, but it still happens. Any ideas?
Also can I fit 225/40/r17 tyres on 8.5 R17 wheels?

Asked on 5 September 2013 by Tonyg

Answered by Alan Ross
Well ref the misfire ,have you had a diagnostic carried out at all? And if so what fault code did you get. If it was P1554 then it may well be that the VANOS system is faulty. Other than that we would also suggest that you check the ECT (engine coolant temp sensor.

As for the tyres, if the size is 255/40/R17 then yes they will fit on 8.5 R17 wheels.
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