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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.
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Tom Butler
1973 RSR Clone
1970 911E Restoration in Progress
Old 02-08-2006, 07:16 PM
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