my A/F gauge is pegged on lean?

kreymis · Apr 16, 2010

i just installed an air fuel ratin gauge. when i start the car its pegged on lean. the red light is very dim until i rev the engine then it gets bright. if i mash the throttle is lights up 1 or 2 more leds but is still in the red (lean). the car was recently tuned and the a/f i know is fine. could i have bad 02 sensors?

393strokervert · Apr 16, 2010

is it a narrow or wide band? mine idles @ right around 16.0, not really sure where it should idle though but....... & also, how far back did you install the a/f gauges 02 sensor?

kreymis · Apr 16, 2010

its a narrow band that taps into the o2 sensor return signal wire

Tanus · Apr 16, 2010

do the plugs show lean also?

kreymis · Apr 16, 2010

no. if anything i thought the car was running rich. it has 42 lb injectors and 55 psi fuel pressure

Tanus · Apr 16, 2010

Id pull the plugs for sure.

55psi at idle or at full boost?

kreymis · Apr 16, 2010

idle.

393strokervert · Apr 16, 2010

IMO narrow bands are pretty much worthless. are your A/F's good while driving? if so, I wouldn't worry about. I would definently invest in a good wideband though, so you always know exactly what is going on with the a/f ratio's. just my .02
is 55lb idle with the vac line unplugged? is that where the tuner set it? if it is I wouldn't mess with it, although it sounds a little high to me, especially if that is the base pressure.

toyman · Apr 16, 2010

kreymis said:
its a narrow band that taps into the o2 sensor return signal wire

Absolutely useless, no ifs, ands or buts. You need a WB controller and O2 sensors if you intend to see and/or need any useful AFR values.

Tanus · Apr 16, 2010

kreymis said:
idle.

I think thats definitely causing some problems, cause if its 55 at idle its probably @ 65 under boost, and injectors dont atomize the fuel properly at that much pressure. I bet it would run way way better with like 55lbs injectors set at 42 psi, haha

Adam95GT · Apr 16, 2010

narrows are just a light show

kreymis · Apr 17, 2010

yea i dont know why i bought it. it still gets me concerned that it pegged on len though. would bad o2 sensors cause that

393strokervert · Apr 17, 2010

kreymis said:
would bad o2 sensors cause that

I don't think so. is the ECM trowing any codes? if an 02sensor was bad you would get a code.

kreymis · Apr 17, 2010

the mil does come on when driving on the highway. i can never get a code out of it though.

my A/F gauge is pegged on lean?

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