air fuel ratios on a standard b18c7

[u mad?]

hey guys, my car has a wideband o2 sensor in it and i think that it may running lean.


under very light throttle i notice it jumps right up 15-20 and even the reader sometimes says 'lean'.

i was under the impression that it should be around 14?

under heavy throttle it goes upto 15 sometimes, is that ok?

its a hondata s300j ecu if that helps



any input will be appreciated!

[Benson]

13.8-14.5 on cruising

12.8-13.0 on full throttle

14.7 on idle

[u mad?]

so 20 is very bad and may damage the engine even on very light throttle?

[Benson]

so 20 is very bad and may damage the engine even on very light throttle?

Get your ecu tuned

[AE092]

16-17 is pretty bad; essentially you're nearing detonation and somethings' bound to let go sooner or later

[string]

16-17 is pretty bad; essentially you're nearing detonation and somethings' bound to let go sooner or later

Are you basing this on your own experience or internet broscience?

[fatboyz39]

Dont see how it'll lean out that much unless you have a bad fuel pump/injectors.

[RandyRhydah]

Get it tuned... benson hit the nail on the head..

you can cheat a bit of economy out of the tune and have it light load cruise around 15:1 ish, but high load should be 13ish for an NA engine.

[u mad?]

thanks for the input guys.

[AE092]

Are you basing this on your own experience or internet broscience?

Was at a dyno day when the tuner pulled the strings on pushing a car as the AFR was going beyond 16.. sure does suggest something to me..

[Vvvtec]

bumps

[PHO]

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