Thread: co2 reading
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mark houghton mark houghton is offline
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Originally Posted by Speedy Squirrel View Post
A 2.7L CIS I presume? It is supposed to be 1.5 to 2.5%. Anything over 3.5% is in the low 13 A/F range. Over 6% is in the low 12 A/F range, which is pretty rich for an idle, but not bad for power.
Back when I had a sniffer (Gunnson Gas Tester) I kept mine at 2.5-3.0. Any higher than that and it was just too rich for my car (each car being different, depending on a lot of things). But that was before I had installed on-board AFR monitoring, which is (was) all I go by now.

Oh...and's CO as in carbon monoxide. Add another oxygen molecule and it becomes CO2 in di-oxide.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 07-21-2014, 06:05 AM
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