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Hello I have a 2003 bmw 745li I have replaced a bent stem valve now car wont start seem to not get spark or fuel it did start and run before with the bent valve .. Do you think the timing is off .

test the timing first, but that's a GIANT job and many things can go wrong on such a big job. Try this video https://www.youtube.com/watch?v=evpaTW2WJ5Y