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A/F problem

1136 Views 1 Reply 2 Participants Last post by  MN91TEG
can't figure out what it could be, my teg normally goes from the bottom of lean to the upper tip of rich, but now at night time the light on the meter will go away and come back but not make it to the rich line. maybe 2-3 lights from it. now at wot during the day with no lights on it will go about half way into the rich area and at night with the lights on it will only go to about the rich line. i don't think that it is the alternator because i also have a autometer volt meter in the car and it pulles 14 volts. not sure why this is dong this. the car never runs this lean and it hasn't had any mods done to it since the guage was installed. a fpr might fix the prob of it running lean at night but than it would run to rich during the day when my lights are off. kinda doesn't make much sends but hopefully someone can understand this thanks
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I'd put money on it that it's your 02 sensor. Just had mine replaced because no lights at all were showing up except for the first 30 seconds the car was running. You can pick up a sensor tester at a hardware store, or maybe even rent one. Instructions come with it on what you're supposed to be getting for a reading or blinking depending on what meter you use.
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