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To further validate your point, it seems to occur only after the motor is hot. On startup I don't get the popping, so the post ignition is more likely once the motor has reached WOT correct? Doug -----Original Message----- From: Steven Ayres [mailto:comwest@att.net] Sent: Wednesday, August 31, 2005 9:36 AM To: type3@vwtype3.org Subject: Re: [T3] Carbs popping DougG=> popping thru the carbs under acceleration. => ... anyone have suggestions? I'm suspecting an intake leak? Actual backfire -- fire up through a carb -- is when an intake valve is open as the cylinder is firing. You may be right about the intake leak, but not, I suspect, the sort of leak you imagine. This is a timing or valve-train problem. Very not good, it can cause carb damage and possibly engine fire. OTOH: To clarify, are you testing and seeing this while standing over the motor, or while driving? if the latter, it's more likely postignition -- fire in the exhaust system -- which is often related to an exhaust leak. Steven Ayres, Prescott AZ '66 343 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~