Header and manifold Thread

[Abrasive]

I run no cat and have not had a problem. I was throwing a insufficient switching code when I first did a dp with no cat, put in an 02 emulator and that fixed it.

Well, like I said, mine was fine for a few years and then one day it just started happening. Some never have the issue, some get it right away and some like me are fine for a while and then it starts. I would have never figured it out had it not been for that thread. And just an FYI, IF you ever do get issue with the cat diagnostic test, an emulator won't stop it. The cat diagnostic purposely creates conditions to check for fluctuations in the reading from the o2 sensor and the signal from an emulator will remain constant which is not what the PCM will want to see.