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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,557
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I too think this may be the piston which is why I asked if the AFRs would recover if the trottle was left at 4000rpm sustained. This would indicate a slow or sticking piston.

You might remove the head and bathe the piston in carb cleaner then wipe down with a soft cloth.

Sorry I didn't get your call, the cell phone is sitting on the dresser and we've had company all weekend.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-29-2009, 10:56 AM
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