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Join Date: Oct 2004
Location: Greenville SC
Posts: 137
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O2 Sensor - Question
When the CAT is removed / eliminated (on a 3.2)what becomes of the O2 sensor........and what about its input to the DME? Please pardon my ignorance on this one.
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Dan '87 Targa |
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01-23-2005, 05:42 AM
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Recreational Mechanic
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That is an interesting question. I think you need to keep the O2 sensor on DME pulsed injection. Based on what I know about bosch pulsed injection systems, I would guess that without the cat, the sensor would read high levels and try to lean out the mixture constantly. Perhaps someone knows a way around this. Sorry I didn't contribute much.
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01-23-2005, 06:24 AM
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Location: Carnation, WA
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The O2 sensor is located before the cat so removing the cat has no effect on its operation.
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David |
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01-23-2005, 06:56 AM
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My bad........I thought it sat right on the entry end of the cat. Thanks for the info......
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Dan '87 Targa |
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01-23-2005, 06:58 AM
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Location: Fort Lauderdale
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There is a place to put the sensor (O2?) in the Dansk "test pipe"
Do I just remove the one from the cat and put it there? How can I tell if it is working properly...can moving these things causes a problem...I will try to remove it very carefully.
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01-23-2005, 07:05 AM
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Join Date: May 2003
Location: Manhattan Beach, CA
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If the O2 sensor is disconnected, the DME goes to a neutral AFR setting, i.e. neutral
fuel mixture set by the internal .50 volts & no longer optimizes the AFR @ 14.7. The DME can be run without the O2 sensor without a CAT or if with a CAT and the miixture is not too rich (>>1.5% CO before the CAT). Check out this web site (www.systemsc.com) on the Waveforms page for more info.
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone |
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01-23-2005, 08:32 AM
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911SC 3.0
