hi, i fill half tank with 93 on my civic ls/vtec turbo, few minutes later when i
stop the afr's goes to 16-17 when normal is 13.7 to 14 ,this can be a bad
fuel. I check for vacuum and exhaust leaks all looks fine. AEM wide band.

thanks

 

good possibility u got a bad batch of gas. maybe a good idea to run some octane booster even though they don't raise octane much. its best u stay out of boost until u get rid of the gas. sometimes u need to recalibrate the wideband and try that and see if it changes.

 

Thanks, you know how to recalibrate the AEM wideband.

 

i believe the aem's CANT be re-calibrate-able.. widebands as well as any other o2 sensors go bad. but if thats the case and your wideband is bad than it pretty much went from a pos to junk

 

yes i'm reading the instructions and no mention nothing about recalibranion