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oxygen sensor bypass/simulator


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oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: April 19, 2010 at 4:26 PM / IP Logged  
I agree the cat shouldn't be needed - except to prevent lung decomposition.
But see about fitting the sensor properly. It will mean better fuel economy - as Awd wrote, free air will make the ECU think there is more O2 than HC, therefore it will increase the fuel injected (watch for black smoke, splugs etc).
But at least it won't hole your pistons!
KPierson 
Platinum - Posts: 3,526
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Joined: April 14, 2005
Location: Ohio, United States
Posted: April 19, 2010 at 4:49 PM / IP Logged  

Do you know if the O2 was before or after the cat?  If it was after it was most likely just to monitor the effectiveness of the cat and wouldn't effect engine management.  If it was precat then the removal of the cat wouldn't effect the O2.

Be careful mounting an O2 sensor in free air - wideband sensors have heaters and need air blown across them to keep them from failing.  I'm not sure about narrow band.

Kevin Pierson
beatnbronco 
Member - Posts: 15
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Joined: March 13, 2010
Location: Kentucky, United States
Posted: April 19, 2010 at 5:15 PM / IP Logged  

there was only 1 sensor and it was before the cat

KPierson 
Platinum - Posts: 3,526
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: April 19, 2010 at 7:08 PM / IP Logged  

You should be able to replace it and the cat shouldn't matter at all since you are metering air before it.

As OldSpark mentioned it may improve fuel encomy.  It's possible that the vehicle is running rich right now to account for the lack of a closed loop fueling system.

Kevin Pierson
oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: April 19, 2010 at 7:44 PM / IP Logged  
FYI:
AFAIK, older vehicles (1990s) didn't have cat checks.
And I'm not sure if the post-cat checks were O2 sensors - but I see cats more as removers of corrosive HS gases and other pollutants (NOx etc).
Certainly wideband sensors are a recent development way after the mid 1990s. (Or am I confusing the 1890s again?)
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