Air/fuel ratio guage help
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This is a discussion on Air/fuel ratio guage help within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; I installed and AutoMeter Comp Air/Fuel ration guage. It has three wires on it. Purple, black and red. I take ...

  1. #1
    Registered User WRXVinny's Avatar
    Join Date
    Oct 2004

    Air/fuel ratio guage help

    I installed and AutoMeter Comp Air/Fuel ration guage. It has three wires on it. Purple, black and red. I take it red goes to the positive terminal on the battary and black is ground and purple goes to the signal. Well I hooked the purple wire to the white wire of the O2 sensor behind the downpipe. The O2 sensor has 3 wires: white/blue/black. I hooked it to the whirte and whwn I start the car it is on the red zone (lean) and one bar lights up all the time no matter if I give it gas or not. The car was not warmed up by the way. Anyone can help me please? Also I heard you can hook it to the ECU box but which wire does it splice to and where is the ECU? Thanks guys in advance!
    TopSpeed S/S header, UP, DP, 3" back, no cats. Samco I/C hoses, XTurbo BOV, EBC @ 16.25 PSI. NGK Iridiuim plugs. AutoMeter pro-comp guages.

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  3. #2
    Registered User wrxrolla's Avatar
    Join Date
    Apr 2005
    Ames, Iowa
    Do you have a wideband o2 sensor?

    Never quit. Never do the expected. Never follow.

  4. #3
    Registered User boosted scoob's Avatar
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    Aug 2004
    Robins AFB, GA
    If you wire up an a/f gauge to the secondary 02 sensor (narrow-band), it will give erroneous readings. The secondary 02 sensor on WRXs do not read the same as regular 02 sensors.
    02 WRX - XS Power header/UP/TBE, XS Power FMIC, MBC@15psi, Ported TD04L, Perrin shortram, Alum Radiator - 13.35@101
    05 Mini Cooper S - Bone stock
    95 Mustang GT conv. (Work In Progress) - BBK LT headers & h-pipe, dumped Flowmasters, Kirban AFPR, BBK subframe braces, 6-point rollcage, FMS springs, 70/30 struts, 50/50 shocks, K&N intake

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