Join Date: Dec 2005
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Excuse my manners....welcome to the forum!
If it's back firing,then either the ignition timings out or you've got a burnt out exhaust valve.
The first thing to check is the cam timing via the timing belt.It is possible that it has had a belt fitted incorrectly and this is causing the fault.If you need further info on this,get back to us.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo