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A/F 29/1, ignition timing is jumping, mileage is terrible

517 Views 7 Replies 3 Participants Last post by  MoHo, 
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2004 rsx-s. It has Hondata k-pro and after the last snow storm it has been acting funny. At some specific speeds with throttle barely pressed in it will start kind of jerking a bit and I lost 150kms range after I gassed up. Noticed that my A/F was at 30/1 while driving and at idle, but sometimes goes down to 14.7/1 momentarily. I have no idea what the problem is. Please help


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Update * when I start the car it idles perfectly at 14.42/1, but as soon as I touch the pedal once, it starts to raise up to 26/1
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Another update* the car has been sending me p0137, and p0138 codes. my SO2 sensor is jumping between 1.3 and 4 volts at idle. I’m assuming this isn’t normal. Does this confirm that I need to replace secondary o2 sensor?
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Perfectionist said:
In the first picture, the green trace at the bottom of the screen (TPS 0%), is that your throttle position sensor data?
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Yes. For that picture I was driving the car. The second picture is showing the car sort of jumping. And the third picture is at idle
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Perfectionist said:
Based on that, I would guess your throttle position sensor is throwing garbage data to your ECU. Its dropping out and jumping all over. Replace it.
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Why do you think tps? It looks fine to me. This was while I was going through gears so of course it would move up and down. I’m more concerned about the 32/1 A/F value on the top of the screen…
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