Slow down light with gutted stock cats?

The system will still work as designed. It can also malfunction just as before...

 

My cats are gutted and i get a slow down light occasionally, if i keep driving its normally off within 15 mins not to reappear for a couple hundred miles..
Never had one bank shut down either.. I think with me its more a occasional fault with one of the CAT ecu's

 

If you don't have real cats then I would disconnect the exhaust ECU. It isn't really monitoring anything at that point, and an extended slow down light will shut you down.

BT

 

I'm looking to do this also. Wondering how it is best accomplished.

Rodney

1990 348TS

 

I've had first hand experience with this problem on my recently aquired 1990 348 ts. When cleaning up the engine compartment I noticed the harness at each ecu was unplugged.So of course I plugged them back in and soon after starting getting erroneous "slow down" lights that will shut down the related cyl bank after about 5 minutes.After doing much research and monitoring the Cats with a lazer temp guage I simply unplugged both ecu's and stowed the loose plugs with a tye wrap.These ecu's are notoriously unreliable and expensive.I seem to remember Ernie posting about this and I believe he did the same.This is a prime example of how a poorly engineered vendor part can make a "monitoring system" more problematic and more expensive to maintain than the system it is protecting!

 

Yes I did. I completely removed the stupid things from the car.

 

I have a 1995 355 Spider and installed straight pipes about a year ago. I disconnected the Cat Temp ECU's and the only problem is the dash slow down lights stayed on. Easy solution is to remove the bulbs so you don't have to look at the red slow down lights all the time. But car runs fine without them. (My car has two).