Originally Posted by bobs
All, There is some really good info on what the PCM does and why it does it in the Onboard Diagnostics section of the service manual. Check page 25-37. Actually, the section on Monitored Systems is pretty good as well. That's on page 25-2. Here's something neat that i found...
yes exactly, that's why taking off the CATs can cause issues...you gain some flow but maybe "annoy" the ECU...