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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2004 Posts: 1,067 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 1,067 | No, that is not always the case. If you run OBDII fuel injection, it will trip a code in your computer if you don't have cats. But will still run fine. I rodded out the cat in my 2002 Grand Am GT when it became clogged (no smog check here), and although it lit the check engine light, it hasn't hurt driveability one bit.
If you're running an EFI that requires OBD1 instead, then you're fine without catalytic converters. An example of that would be the L98 tuned port fuel injection from a Corvette.
52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird
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