A friend of mine has a 1999 v6 gmc jimmy that's burning rich he was told he had bad oxygen sensors and the check engine light came on now it's off I replaced the spark plugs and it was burning rich is there a way to adjust the mixture and do the sensors still need to be replaced?
If I can't adjust the ratio then how do I fix that problem? New injectors?
If I can't adjust the ratio then how do I fix that problem? New injectors?