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Techno Duck Techno Duck is offline
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Join Date: Mar 2003
Location: San Diego, CA
Posts: 4,841
Garage
Whats the mileage on the cat? High NO is either lean mixture (vacuum leaks) or a bad cat. CA legal replacements are available.

Even your CO numbers are high. When was the last tune up? Plugs, cap, rotor and wires if needed. Weak ignition will raise your HC readings also.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
Old 02-17-2019, 06:47 PM
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