anyone used the nissan oxygen sensors? - Page 2 - Defender Source
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  #21  
Old April 18th, 2006, 06:30 PM
Chris V

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Make sure you CPU is properly grounded.
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  #22  
Old April 19th, 2006, 01:39 PM
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Hans Haase
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Matt. I'd say go ahead and replace the fuel pump relay too in that case. The extra load placed on it by the bad pump might have done something internally. I'll have to search to try and find the relay part numbers that had been quoted around on here somewhere.

-Hans

Follow-up Post:

Ok, found it. Bosch part number P2020-24499 should be an exact replacement on the fuel pump relay. Or, just take the old one down to a GOOD parts store and say "Gimmie one of these"

-Hans
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  #23  
Old April 19th, 2006, 06:17 PM
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hans-replacing the relay- is that running rich related? the fuel pump seems fine.
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  #24  
Old April 19th, 2006, 07:54 PM
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Possibly, because of what else the relay powers. It also supplies the power to the heating elements in the O2 sensors, and I think the supply voltage for the sensors themselves. Because they are so far downstream, they need the internal heaters in order to stay at operating temperature. If the heaters aren't getting power, they will generally not register properly and sense a lean-burn condition.... the result is that the ECU will send more fuel to the engine. Not to mention, they won't be able to self-clean anywhere near as good either.

I'd test the wire continuity between the relay and the o2 sensors first. When I get home, I'll dig out the wiring diagram and double check if there are any other switch-points to check on them.

-Hans
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