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MarkS=> What could be causing this? At the risk of becoming tedious I must again distinguish between explosion through the intake (backfire) and explosion in the exhaust (postignition). You didn't mention that your your air cleaner blew off, so this sounds like postignition or a sticky exhaust valve. Someone else has already pointed to the possibility of fuel buildup in the exhaust. If it's loud enough to scare the neighbors, however, and it only happens once in a while, it's probably a good idea to take a look at your valve guides. With the right combination of wear and low lubrication a valve stem can bind, allowing fire out the valve. Steven Ayres, Prescott AZ '66 KG1600 ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org