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tom1394racing tom1394racing is offline
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Join Date: Jan 2004
Location: CT
Posts: 10,251
My experience is that this condition is caused by a leak in the exhaust (hole in muffler or leak in the heat exchange to muffler connections). Lifting off the throttle rapidly causes a rich mixture leading to unburnt fuel in the exhaust stream that gets ignited when exposed to outside air at the exhaust system leak.

Check you muffler connections for carbon trails.
Tom Butler
1973 RSR Clone
1970 911E Restoration in Progress
Old 02-08-2006, 07:16 PM
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