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whats pulled out of your intake is not an o2 sensor it is and intake air temperature sensor. the oxygen sensor is located in the exhaust manifold and you would deffinatly get a code if you pulled that out. the intake air temp sensor is part of the ecu's means to apportion the correct amount of fuel to your engine. it works with other sensors like the map sensor to tell the ecu how much air is going into the cylinders according to pressures and the air temp so it knows the correct amount of fuel to dump to try and achieve a perfect combustion process. by removing the intake air temp sensor you are throwing off the results of the actual temp of the air going through your intake. the ecu has maps for all this stuff so it knows what its doing. so if the actual intake temp is 70 degrees and you have the sensor hanging in the engine bay and its reading 120 degrees your ecu is going to use the wrong calculations from its maps to determine ignition timing and fuel delivery. this will barely be noticed in closed loop mode (smaller throttle loads) because the results from the oxygen sensor will be showing the richness and leaness of the actual combustion process and the ecu will make adjustments as it sees fit based on those results. but in open loop mode (heavy to full throttle) these sensors become more important because the ecu ingnores the results from the oxygen sensors and makes its fuel and ignition judgments based on intake air temp, map values, throttle position, etc. only. just drill a hole and plug it in, you'll be better off in the long run. if you really wanna get the thing to throw a code then remove it or put a lighter to it and you'll get that code your looking for although i would highly advise against it!!
hope that helps
p.s. the reason its probably not given a code yet is because it hasnt seen a value that is to out of the norm yet.
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12-22-2001, 11:12 AM
