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

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

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.

Re:Running super lean
 

Yeah get rid of that ebay chip.

Re:Running super lean
 

sometimes u can foul the o2 if you are too rich.

Re:Running super lean
 

That is probably the problem. If I unplug the O2 sensor, will that create problems with the ecu running lean?

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.