air / fuel gauge
#1
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Location: Elk Grove, IL
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air / fuel gauge
i got an air fuel gauge the other day and wired it all up at the ECU. i started the car and the gauge didnt show any reading, i figured the O2 sensor had to warm up, i wait a few minutes and still nothing. i take it for a little drive and it does light up while acclerating and crusing but when i come let off the gas i get nothing again, i know that it is supposed to go lean when you let off of the gas but it doesnt even light up lean on the gauge. from a stop if i floor it all the way to 6000 rpm it never goes more than 1 or 2 bars into rich, i thought rx7s ran super rich. while just crusing at a steady speed it goes from full lean to just before the first rich light, i know it is supposed to bounce back and forth, i just have a feeling its supposed to go more into rich. i replaced the O2 sensor today and still the same results, only now gauge doesnt show anything sometimes when just crusing and other times it is bouncing back and forth. could i have some clogged injectors or bad pump?
#3
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You could also have a ground loop. I would try and run an added ground wire to the O2 sensor (1 wire?) and see if that helps. We typically use a spade or open-end (i.e. "fork") connector with NO INSULATOR and use a band clamp on the O2 sensor housing as far away from the exhaust as possible.
-Ted
-Ted
#6
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Yeah, sorry about the confusion. The AFR gauge ground should be common to the O2 sensor ground. 1-wire O2 sensor grounds through the housing, so you need to secure the added ground wire to the O2 sensor housing.
-Ted
-Ted
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