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spyerx spyerx is offline
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Join Date: Apr 2013
Posts: 465
With that much variation something is off
See this thread when mine fails a few years ago
https://forums.pelicanparts.com/porsche-911-technical-forum/922792-smog-failed-high-co-low-speed-test-ideas.html

Things to check
O2 sensor
Valves adjusted
Plugs and ignition good
Stock tune
Connect the wire next to ecu (it is stock)

With mine it was the afm base idle running rich.

Based on how out yours is, suspect the cat or badly out of tune engine. Did it pass ok last time?

Black Forest is a good shop
Old 02-17-2019, 06:18 PM
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