While troubleshooting my son's 92 Camaro V6, I noticed the scan tool constantly indicates the engine is running in open loop. The O2 reading is very constant, not varying as much as I'm use to seeing. The car has this extreme power loss, which I'm being to believe is a restrictive CAT.. still not sure yet. Anyhow, what set of conditions for this application must be met to go into closed loop? BTW MAT temp is only being read by a sensor on the dirty side of the air cleaner. No codes are being set. Help!!