Thread: Running no Cat.

1997 GTP, will this mess up the fuel parameters? if I run no cat?

u will be fine... have to get code set to non report for no ses light. i have no EGR or CAT and still get 30+ mpg on highway trips.

You'll think your running richer because you smell the gas more...but your not. It's fine...infact in those year cars you can just buy an o2 sim

Im running with out a cat and am getting horrible gas mileage could this be why? Im going to have the code deleted. would it be a good idea to get an o2 sim? sorry to thread jack lol

Originally Posted by Ricky21

Im running with out a cat and am getting horrible gas mileage could this be why? Im going to have the code deleted. would it be a good idea to get an o2 sim? sorry to thread jack lol

no. the rear sensor, then one that would detect theres no cat, has no effect on air/fuel ratios