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Check For Busted O2 Sensor?

bj_dove

By bj_dove,
in Engines & Forced Induction

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Pauly33GTS-t Veteran

Pauly33GTS-t

Posted
Posted

ehe, yes you do have a problem with economy...

If it is hunting at idle (always fluctuating revs) then im sure its your O2 sensor, if I were you though id be more confident with a second opinion from another person on the forums here...

Pauly33GTS-t Veteran

Pauly33GTS-t

Posted
Posted

manwhore wats the max latency that the injector cycle should be on consult, I have a greddy intelligent informeter and Im trying ot configure it to show percentage injector duty cycle and then set warning points. i love this thing... lol.

blind_elk Grand Master

blind_elk

Posted
Posted
yeah cheers, when cold (anywhere under operating temp) it does hunt at idle. Think ive got an o2 sensor off my old 32 here might give it a try, cheers :woot:

"Hunting" is generally a sign of a gummed up AAC valve. And the O2 sensor is unlikely to be used at idle, or when the engine is not up to operating temp. So, if you only do short trips that don't get the engine up to temp properly, then you are going to chew petrol.

How to test - check the voltage coming off the middle wire of the sensor - it should be oscillating around 0.5V (say 0.3 - 0.7). If it is constantly high (1V) or low 0V) then there is a chance your O2 sensor is cactus.

You might also want to check that the sensor is getting 12V on one of the other 2 wires.

InterCooL Rising Star

InterCooL

Posted
Posted

multimeter is the way to check. takes 2 mins.

measure it at idle, give it a rev, and hold it at a sustained rpm, say 2500rpm.

see if you have fluctuating volts

last skyline i checked (a friends) it was dead as a doornail, got no change in volts. replaced it and the car got an extra 50-80km's iirc (hopefully you gain some more!)

also on my skyline i changed spark plugs, cleaned afm and got new coilpacks, that gave me 2L / 100km better economy! my plugs were old though

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