No O2
04-24-2010, 12:56 PM
#1
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No O2
Recently, a mechanic that installed headers on a friends 3.0 told him that the O2 sensor was not necessary on his truck (1990) and didn't weld on a flange for the sensor. This seems incorrect to me but the mechanic has years of experience. What will happen if it is run without a oxygen sensor? Thanks for any information.
04-24-2010, 04:38 PM
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Definitely not the authority on the matter, but as I understand it, without a direct O2 reading, the computer will default into open loop mode, running the engine on preset values as opposed to taking real time readings from a non-existent sensor. I'm pretty sure those preset defaults are nowhere near as efficient as real time information though, so maybe slight performance and mpg suffering.
04-24-2010, 05:35 PM
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That mechanic is an idiot, you definatly need an 02 sensor for the fuel injection to operate properly. I would tell your friend not to go back to him again for any other engine work.
