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  #1  
Old January 19th, 2009, 08:06 AM
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brian bertolini
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Running rich without throwing codes

Anyone else ever had this problem? Could no cats cause it? Is there anything else that would perhaps not set off the check engine light?
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  #2  
Old January 19th, 2009, 02:19 PM
MonLand
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What vehicule?
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Old January 19th, 2009, 07:15 PM
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brian bertolini
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Sorry it's a 95 defender nas.
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  #4  
Old January 19th, 2009, 09:24 PM
MonLand
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Quote:
Originally Posted by vesparover
Anyone else ever had this problem? Could no cats cause it? Is there anything else that would perhaps not set off the check engine light?
Yes, bad o2 sensor(s) can do that. Can't remember in what situation though, but the ECU may not detect that the sensor is dying.
Now, my '95 smells like it's running rich, but emission tests show it in the normal range....
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I have an ex MoD and an ex wife. The two no longer conflict with each other.
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  #5  
Old January 19th, 2009, 10:32 PM
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Slow switching O2s.

You can check them with a scope. If it is just black smoke and smells rich, it is probably your lack of cats and might not be actually running rich.
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  #6  
Old January 20th, 2009, 07:10 AM
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If you are not running cats the motor will run rich and to correct this you need to switch to a UK non cat tune, by using the correct tune select resistor.

I think the tune select resistor is probably not present in your rig but can be added (cant remember what ECU pins to use off the top of my head but its in the wiring diagrams as well as the tune select resistor info).

Or...do the right thing and put some HP cats in it and run right as well as legally.
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  #7  
Old January 20th, 2009, 02:21 PM
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I have a set of used O2 sensors that were working fine out of my 94. let me know before I chuck them if you want to try them out. I changed mine out when I got new cats and went with headers.
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Old January 20th, 2009, 03:41 PM
MonLand
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Don't throw them out. If no one takes them, I will (eventhough I already have a set of used sensors that I still haven't had a chance to test).
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I have an ex MoD and an ex wife. The two no longer conflict with each other.
Quote:
it is not hoarding it is selective collecting
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  #9  
Old January 20th, 2009, 04:05 PM
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Justin Tebbenkamp
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Same Problem...with cats

I'm having the same problem...but still have cats. No codes..and no smoke!! I was told to check my air filter first...followed by the O2 sensors...does that sound right?
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