Quote:
Originally Posted by nicktyler
They are talking bollox about the exhaust flap. How coud that cause a missfire? I had the same thing and as mentioned it was a pre cat O2 sensor. It should store a code for this though. I would get the codes read while the light is on (without restarting etc) if possible.
ask them for the codes they read that pointed to a missfire, which cylider/cylinders where they in? If they say 1-3 you have left bank pre cat O2 sensor and if 4-6 you have right bank. If it is a single cylinder or 1&5 it points to something else like coils/plugs/injectors.
Is it lumpy on idle and cold start up, or is it fine untill the light comes on under load?
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Thanks Nick.
It varies.
A few times I've started it up, and it's clearly misfiring. Other times it's perfect then stutters under load and the light comes on.
It first came on while driving home from BMW in November after having the wastegate rattle fixed.