Remove catalytic converter ?

Joined
Jun 14, 2010
Messages
657
Location
Flooded timber of Arkansas
In arkansas we don't require a smog test on vehicles. Would my lc run any better if i cut the cat converter off and had a pipe welded in? Or would this cause an O2 sensor to go into fault mode or something similar?

Always lookin for improvement!
 

Trunk Monkey

Moderator
 
 
Joined
Apr 27, 2003
Messages
9,117
Location
Salt Lake City
Bad idea. The O2 sensors will not feed the ECU a good reading before and after, which will cause the ECU to try to compensate the air/fuel mix. Could lead to lean mix, rich mix and all the fun problems that are associated. You're driving a 3 ton truck that's made for longevity, not performance. If you want that, get a Ford and chip it.
 

crimsonaudio

1972 (late '71 build)
SILVER Star
Joined
Jul 25, 2010
Messages
1,468
Location
West TN
Your front O2 sensors give the ECU the data it needs to alter the fuel/air ratio, the rears basically just tell you if the cats are working. If you remove the cats, you'll throw P0420 and P0430 codes (CEL will be on). You can 'trick' the ECU but modifying the readings coming off the rear O2 sensor, but in reality, you're simply better off leaving it alone.

Not sure what sort of improvement you're looking for, but I doubt this is going to noticeably alter performance - and if they ever do start inspecting, you'll have the joy of replacing both cats...
 
Joined
Apr 7, 2015
Messages
928
or if you sell it to a state that does have smog testing. IMO, having the check engine light on would drive me nuts.
 
Joined
Feb 18, 2019
Messages
63
Location
Carmel, IN
Or just use the after-market high flow cat replacements that will give you more flow & power while helping a bit with fuel efficiency.
You may want to change the air filter to a K&N for increased input to match the new increased output...
 
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