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Oxygen Sensor turned red

This is a discussion on Oxygen Sensor turned red within the General Help forums, part of the LSx Technical Help Section category; Questions: 1. What will turn an O2 sensor RED? 2. Why a new bouncing RPM indicator? I have an LS1 ...

  1. #1
    Junior Member
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    red
    2002

    Oxygen Sensor turned red

    Questions:
    1. What will turn an O2 sensor RED?
    2. Why a new bouncing RPM indicator?

    I have an LS1 in an RV7 kitbuild airplane. I haven't been able to find any mechanics that I trust who seem to know what they're talking about when it comes to BOTH airplanes and LS1 engines; so I decided to educate myself (just starting).

    The engine was running rough and backfired on the R-side only. I replaced the R-side O2 sensor and it resolved. Immediately after this 10-minute repair, the RPM Indicator started bouncing by 700 RPMs but only when the enginge is between 1500-2300 RPMs. I replaced the L-side O2 sensor and the engine is even smoother, but still RPM needle bouncing:

  2. #2
    Life in the Fast lane sunsetorangess's Avatar
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    Met. Sunset Orange
    01 SS

    Stuck injector or valve. Pull plugs and check to make sure there not fouled. Plugged cat may also be an issue
    J
    2001 SS, Its not the car its the Driver that matters....

  3. #3
    Junior Member
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    red
    2002

    Thanks a lot, I'll check on the plugs. The nice thing about the airplane is I don't need a cat.

  4. #4
    Nitrous Tuner LS2Tuner's Avatar
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    05 Goat SMASHED

    Key ? here. . . . . . . . . !

    You said it's in a plane. You are running 100 octane Aviation Fuel in it then you get at the air port right?

    Even though MANY refer to that as a No Lead fuel it actually has a high content of lead.

    Welcome to the site!

    Can we get some pics?
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

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