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Exhaust 5.2L Wxhaust Discussion


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  #1  
Old 10-31-2010, 11:24 PM
whosdunit whosdunit is offline
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Default Oxgn. sensors???

I'm totaly new here, (I dr. a stk 91, D350 168,000mi) to gassers, a friend ask me how to by pass the oxgn., sensors on his 96 1500 5.2(318) 4x4 auto. , I DON'T KNOW but i know where to find out. Sooo, give me the good& bad,and what about the computor? He say;s his has 3, dual exc., & cat. I would think his fuel mpg., would suffer, and run uneven,ya'll tell me i tell him. thanks for the welcome's Tom, and the rest.
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Old 11-01-2010, 12:05 AM
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You are absolutely right to be concerned about the computer. O2 sensors analyze the products of combustion and provide feedback to the computer so it can adjust the fuel injectors so the correct fuel/air ratio can be maintained for emmisions control and fuel economy. His 96 most likely has the newer generation On Board Diagnostics(OBDII) computer system. I'm just a shade tree guy, but that is my basic understanding of how this works(experts: feel free to correct me if I am wrong). Probably a bad idea for anyone who has to ask how to do it.
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Old 11-18-2010, 02:15 PM
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There is a way to bypass the 02 sensors its a small module that plugs into the 02 sensor plug and tricking the computer. I just cant recall the name. I'll look for it.
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Old 11-18-2010, 09:53 PM
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wouldnt bypassing the sensors just make the truck run richer? i know more fuel usually means more hp but wouldnt he need to ramp up the air to help burn the extra fuel? just a thought.
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Old 11-19-2010, 10:09 PM
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Computer reads da module as a working sensor thus no reason to burn rich
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Old 11-20-2010, 01:49 AM
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The O2 simulators are basically like a resistor in a circuit, so it just presents itself as a functioning sensor, allowing you to remove things like the cats without throwing codes.
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Old 11-20-2010, 08:11 AM
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You don't want to disable the upstream sensors because those are the feedback sensors the PCM uses to calculate the fuel curve. Placing a resistor in the upstream signal will cause the fuel curve to remain basically unchanged which would be bad when the weather changes because it will be running either too rich or too lean. Fuel economy and power would go into the toilet. Then you have to contend with the PCM setting codes because it isn't seen the sensors switching voltages. If he doesn't plan to remove the converters, there's no reason to disable the downstream sensors.
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