O2 sensor placement
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O2 sensor placement I just installed new head gaskets and pacesetter LTs and I havent extended the wires for the two front O2s yet...... my rears have been deleted. what happens if u have the two front O2s plugged in, but not threaded in the header hole??? i wanna start it up and get it idleing.......................
It won't idle about 30 seconds after the car hits closed loop (when coolant temp becomes greater than ~100*F). The O2 sensors will read the oxygen content in the air outside of the exhaust and the PCM will start dumping in all kinds of fuel as this will appear as a severly lean condition. You need to have the front O2's in the exhaust stream sealed up tight unless the car is programed to run in open loop full time.
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ok thank you for the quick reply......... i am running the car open headers.... real open headers, no y pipe 
i will get those extended and in their holes, and then get it over to the tuner to be retuned and get it to idle. it wont idle at all anyways, weather its cold or up to temp
i will get those extended and in their holes, and then get it over to the tuner to be retuned and get it to idle. it wont idle at all anyways, weather its cold or up to temp Well, you're going to run into the same issue with open headers. The exhaust needs to be sealed anywhere near the O2's if you're going to run closed loop. If you run open loop, then you can run open headers all day long and don't even need the O2's.
open loop is default for the the ecu. aka produced the most emissions, it uses default settings until the ecu can run all diagn and current conditions are met aka a/f ratio water temp, if u have it tuned in open loop u can control the defaults and hence ridding yourself of o2s ect. however you will never be near as fuel efficient in open loop.
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Originally Posted by ricethis
can u explain why someone would run in open loop instead of closed loop??
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im not going to be driving the car daily, maybe just once or twice a week....... i hate o2s and wish i could just get rid of them....... so your saying that i can have my car tuned in open loop and be fine? my gas mileage cant get any worse so i dont care about that lol. im running it open headers, no Y pipe...... how do you monitor your car? do you have a tuning program??
