Gas Mileage Suffering
#1
Gas Mileage Suffering
My gas mileage is suffering and has been ever since I "modified" my catalytic converter. The Check engine light is always on and throwing downstream sensor codes. Everything else has been ruled out (new plugs, coils, pvc, air filter, IAC sensor cleaned, t/b cleaned, etc. I just didn't think the cat could have a negative effect on gas mileage since it is only the downstream sensor affected (which is not supposed to factor into the a/f or otherwise affect engine conditions). Is this not the case?? I'm considering throwing another stock cat back on, but figured someone could give me some real insight to my downstream sensor plight. Thanks in advance for any help.
#2
Originally Posted by Cosmo459sx
My gas mileage is suffering and has been ever since I "modified" my catalytic converter. The Check engine light is always on and throwing downstream sensor codes. Everything else has been ruled out (new plugs, coils, pvc, air filter, IAC sensor cleaned, t/b cleaned, etc. I just didn't think the cat could have a negative effect on gas mileage since it is only the downstream sensor affected (which is not supposed to factor into the a/f or otherwise affect engine conditions). Is this not the case?? I'm considering throwing another stock cat back on, but figured someone could give me some real insight to my downstream sensor plight. Thanks in advance for any help.
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