Hey guys I have to drill a hole in my blackjack headers for my O2 sensor.... I will not be running an O2 sensor for a while in other words will I be OK??? Will it eat gas or something though?

 

Nobody knows?

 

It should start and run in open-loop mode b/c that's what normally happens until the O2 sensor heats up and supplies an appropriate signal to the ECM. Without an O2 sensor / signal, it'll never go into closed loop mode. So, it'll likely run rich - I'm not positive if this is considered limp-mode. That also means it'll likey use more fuel than normal. How much more ... I don't know.

 

The ECM will see the O2 voltage stuck at .450V and will set a code 13, and the SES will come on. The car will still run, but there will be no closed loop, which may cause increased fuel consumption, and isnt good for the cat if you still have one.

 

No car headers and duals all the way back straightpipes...

 

My >>===> guess <===<< is that with an invalid O2 sensor reading the system will default to a factory set value. This may or may not affect gas consumption compared to an engine with working O2 sensors.

On another note I believe the O2 sensors must be placed in a point in the exhaust system where they will function properly. I do not think an O2 sensor can be placed 'just anywhere' and have it perform properly. If they are placed in the exhaust stream where the gas is 'too hot' or 'too cold' they will probably not perform correctly.

All of this is from my limited amount of on-line research trying to fix an O2 problem on my 1995 Concorde.