Do I need 02 sensors if I don't have converters? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 12-02-2007
Needforspeed3685's Avatar
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Do I need 02 sensors if I don't have converters?

I have true duals with no catalytic converters and Flowmaster 40 series mufflers. Does it make any sense to drill holes, weld in bosses, and attach all four o2 sensors if I don't have catalytic converters? Will the 02 sensors still trip a CEL for improper catalyzation or something?

Thanks to anyone who understands the 02 sensors and catalyst system.
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Old 12-02-2007
04 EDGE
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your cel is going to come on if there un-pluged. if you weld in bungs and install the downstream sensors the cel will still come on.

you could get a pair of uni converters. it wont hurt the performance at all and you wont get a cel
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Old 12-02-2007
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Quote:
Originally Posted by 04 EDGE
your cel is going to come on if there un-pluged. if you weld in bungs and install the downstream sensors the cel will still come on.

you could get a pair of uni converters. it wont hurt the performance at all and you wont get a cel
Actually, my "Check Gage" light doesn't come on with the o2 sensors disconnected and no cats present. It shows that it's on when I connect my OBDII scanner, but it doesn't actually light up on the dash.

Also, I don't care to spend money on converters that I don't need just to get rid of a light. My concern is that my gas mileage is being compromised from the lack of O2 sensors.
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Old 12-02-2007
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The front 02s do indeed effect part throttle driveability.

Rich
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Old 12-03-2007
04 EDGE
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well maybe you should have just put another 4 cyl in it if your "concerned" lol
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Old 12-03-2007
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i know Magnaflow makes performance cats......you might look into getting them.....

not having them on an engine designed to have them will decrease the performance of them because the computer will change the fuel map for the engine if it doesnt see the cats/O2 sensor readings....
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  #7  
Old 12-03-2007
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Put the o2 sensors in, and get o2 simulators, then you don't need cats...
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Old 12-03-2007
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The rear 2 sensors are there to monitor catalyst condition for OBDII. They have no effect on performance or mileage.

The front 2 are important and do 2 things:
-Feedback control of the mixture during closed loop operation - good for fuel economy and emissions (when used with cats).
-Determination of the open loop fuel multiplier - corrects mixture for open loop performance.
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Old 12-03-2007
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Quote:
Originally Posted by rwenzing
-Determination of the open loop fuel multiplier - corrects mixture for open loop performance.
Is WOT considered open loop?

Rich
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Old 12-03-2007
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Quote:
Originally Posted by wydopnthrtl
Is WOT considered open loop?

Rich
Yes. The PCM learns the long term fuel trim in closed loop to drive the short term fuel trim toward zero. LTFT is also used to calculate an open loop fuel multiplier. This helps to correct for fueling errors caused by production variability or in service problems like a dirty MAF sensor (within limits, of course).
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