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b230ft backfire & poor power curve 700 1989

posted by  Don Foster on  Wed May 22 05:56 CST 2002
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

One (somewhat unlikely) possibility is that the cam has shifted timing. Your symptoms sound much like what happened on my '83 244 non-turbo when I replced the t-belt but was off one tooth. In a 740, of course, missing a tooth at the cam will affect both the cam and the ignition timing.

If the timing marks all align, then it's possible that the pin between the sprocket and cam has sheared.

As I said, this is possible but not common. Chase this one when all else fails. Take my comment as food for thought instead of a call to action.
--
Don Foster (near Cape Cod, MA)






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