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Dutch924-racer · Joined: 23 Jul 2007 Posts: 1081 Location: The Netherlands

For adjusting CO2 the say you need a special tool in the Haynes manual, what kind of tool do I need ?
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937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

All you need is a long 3mm hex wrench.

Depending on the model year of the car, here in the U.S. there may be a plug in the hole for the CO adjustment which must be pressed out from the bottom side of the air flow sensor unit, or drilled out, or may just have a rubber plug on a stick stuffed in it.

No matter what you have, you need to plug the hole when you are done, because the leak through the hole will affect the CO.