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Running super lean

Old 07-25-2003, 03:11 AM
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Default Running super lean

I used to run a little rich on my a/f guage, now it is all the way lean, only goes up a little when I am on the freeway at WOT. It never goes past stoich. Most of the time as far lean as you can go. Could it be the Ebay ecu chip I installed in my ECU? I have a b16a with PR4 chipped ecu and vtec controller
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Old 07-25-2003, 03:47 AM
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Default Re:Running super lean

sometimes those ebay chips will advance your timing.. You never know what those chips are doing. I'd say ditch the chip and see what happens.

Nick
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Old 07-31-2003, 11:28 PM
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Default Re:Running super lean

I have the same problem, except it started when I installed my MSD 6A. I think the gauge is just screwwed because I put in 450 injectors and had gas coming out of my exhaust... and the gauge still said I was lean.
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Old 08-01-2003, 01:47 AM
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Default Re:Running super lean

Yeah get rid of that ebay chip.
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Old 08-01-2003, 11:34 AM
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Default Re:Running super lean

sometimes u can foul the o2 if you are too rich.
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Old 08-01-2003, 01:42 PM
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Default Re:Running super lean

That is probably the problem. If I unplug the O2 sensor, will that create problems with the ecu running lean?
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Old 08-01-2003, 01:53 PM
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Default Re:Running super lean

Test your wiring, then try a new O2 sensor, they run $20 for generic Bosch 1 wire. Sounds like old age or a bad connection got to you current one.

Beware of the eBay mystery chip, if you're trying to mix it with forced induction, then the ignition timing could be a very very scary thing.
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