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High O2 and poor gas mileage

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john saleeby

Active Member
Joined
Aug 5, 2006
Messages
482
Scanmaster at idle and car warmed up shows O2 in the 800 to 850 range. BL and INT read around 126 to 128. I barely get 200 miles from a tank of gas city driving. Knock ranges from 2 to 6 when I stomp on it from a dead stop.

Usual bolt ons to a stock motor. No alky. 45000 miles on car. TT chip

Biggest concern is the knock. Suggestions ideas as to cause/fixes?

Thanks

John
 
The reason your O2's read that high at idle is because your chip is an open loop idle chip. Chips that run closed loop idle would have your O2's all over the place as normal.
Many modern aftermarket chips use open loop idle to smooth out the idle.
As for gas mileage (especially around town) that's usually an issue with driving habits.
 
fp is 43 with the hose off. The O2 jumps around during routine driving but is still in the 800 plus range whether at idle or just tooling around.
 
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