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F20A7 O2 Sensor testing

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    #1

    F20A7 O2 Sensor testing

    Hey

    I have idle problems with my UK spec '93 Accord Coupé.

    Here are the exact symptoms when the problem started:

    - Warm up fast idle fine.
    - Idle okay BUT
    - Touch the throttle even slightly (i.e. without even really increasing the revs) and the idle dropped to 400 or even stalled. If it didn't stall it hunted a few times back up to 900.

    The car stalled with IACV unplugged so I gave the idle screw two complete turns to bring the idle without IACV up to 450rpm. This fixed the problem for a while but the problem eventually returned. I gave the screw another couple of turns and it got slightly better but only just.

    So it seems like there's way too much fuel for some reason?

    I also have an intermittent code 43 from the ECU.

    I've pulled the O2 sensor and tried testing the voltage output with a blow torch and multimeter - anyone tried this?

    Voltage went quite quickly to .9v then dropped slightly to .8v put dived back to basically zero as soon as I removed the heat.

    Any ideas?

    cheers,
    dod
    1993 Accord Coupé
    1989 RX7 Turbo II
    1989 Charade Turbo
    Tags: None
    #2
    No one?
    1993 Accord Coupé
    1989 RX7 Turbo II
    1989 Charade Turbo

    Comment

      #3
      Originally posted by doddy View Post
      No one?
      code 43 means fuel supply system which usually leads to the o2 sensor being broken.

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