80 running rough after Cat delete (1 Viewer)

Joined
Oct 8, 2017
Messages
344
Location
Oneida, TN
Hello!

Just picked up the LC after getting the CDL fixed as well as the cat removed. I was looking forward to a smooth ride home, but it feels like it is misfiring, or at least running rough. Toyocom shows switching from lean to rich alot. The short o2 has been replaced with a new OEM, the other is in place but is original.

No other changes to the vehicle. No CEL.

Could it be a backpressure change? Should I have the ECU relearn with no cats?

Any help is appreciated.

Scott
 
Last edited:
Joined
Jul 4, 2019
Messages
570
Location
Lexington KY, Boston MA
I can’t think of any reason why it would not run without the cat. I’d definitely replace the old sensor so you have 2 new.

And also check unrelated stuff, wire harness at the firewall/ vacuum leaks, and so on. It’s possible that something was disturbed when the work was done that has nothing to do with the exhaust.
 

retrofive

SILVER Star
Joined
Jan 6, 2008
Messages
15,207
Location
so. oregon
If like said the battery was disconnected, how many miles have you put on it since? The ECU goes through a learn cycle. Stop and start cycles and hwy speeds. Mine always ran like crap for about a week for it to relearn.
 

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