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74-911 74-911 is offline
Join Date: Dec 2003
Location: Fulshear, Texanistan
Posts: 3,160
Mine did the same thing after about 15 years. I just removed the old epoxy from the popoff valve and the airbox, cleaned up then roughed up both surfaces and re-expoxied it.

From what I understand (and that's not much), it is virtually impossible to totally eliminate backfires on CIS engines.
74 911 Coupe
2.7L - K21 Option - S suspension
Old 01-03-2004, 07:02 PM
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