Will removing the catalytic converters on either a '87 or '92 5.0 result in new engine codes.
Thanks

 

The CEL will more then likely, come on for O2 sensor readings that are not within spec.
This will effect the A:F ratio as well, as it tries to adjust for the emissions error.

 

Neither '87 nor '92 V-8s had cat sensing; that is done with an O2 both in front of and behind each cat, which began I believe in 1994.

When I put a '91 5.0 HO in my '78 Ranchero, I used NO CATS, one O2 on each bank, and got NO codes. imp

 

Thanks. Appreciate the info.

 

This^^^ only correction is the mustang gts didnt get catalytic monitoring untill 96 when they all switched over to OBD2 monitoring.

 

just got to rado shack and get the parts to build o2 simulators for the rear o2s

 

If you don't run o2 sensors,the adaptive learning feature in the ecu wont work.I believe the o2 simulators only work on later models anyway,dont they,to prevent the check engine light from coming on??
I don't recall throwing any codes when I removed mine,but if you don't like smelling & smelling like raw gas/exhaust fumes, I suggest you retain your cats or buy aftermarket ones that have both catalysts inside each cat,instead of needing 4 cats,like the oem hpipe has.IOW- the stock hpipe uses two cats for each bank.One cat is a reduction catalyst and the second cat is a oxidation catalyst.They put both inside one cat on an aftermarket converter.
The smog pump and numerous other thermactor system components have to be retained & in working order when running the stock hpipe and aftermarket cat hpipes with an airtube in place.If these components arent used,the cats will clog & fail due to lack of smog pump air.Smog pump air is needed to physically make the catalytic reaction occur in the second set of cats (oxidation cats) on the oem hpipe.The first set of cats on the oem hpipe dont use smog pump air.
If you decide to delete the converters,go ahead & delete the smog pump and the thermactor components .Retaining them can cause a possible lean condition since the smog pump will still be sending air to the hpipe eventhough the cats are gone and smog air is no longer needed.8x codes will be triggered due to this change,but they wont trigger a cel or driveability issue.

 

foxes don't have rear o/2's …..so removing cats on a fox will NOT cause any codes....remove away

 

When I bought my '87, I replaced the H-pipe with a Motorsport Off-Road Exhaust Kit, which consisted of a new H-pipe with no cats.

No CEL ever. 31 years and counting.