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    Help! One indicator of a bad MAF/relays is when the...

    One indicator of a bad MAF/relays is when the engine runs better with MAF disconnected than when it's connected.
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    Help! I've searched u-tube for such info for my '89...

    I've searched u-tube for such info for my '89 vert and found that most vids are too brief to be really helpful.
    There is available a DVD instruction set from a top manufacturer though a bit pricy,...
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    Help! When you jumper ALDL pins A & B and turn ign to...

    When you jumper ALDL pins A & B and turn ign to On what codes you get?
    Code 33 = MAF hi voltage
    Code 34 = MAF low voltage
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    If your '93 has an OBD 1 ALDL jumper pins A & B...

    If your '93 has an OBD 1 ALDL jumper pins A & B (two upper right) to get the SES codes flashing.
    If it's OBD 2 you will need to use a scan tool.
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    Was your procedure: -key off, insert A-B jumper...

    Was your procedure:
    -key off, insert A-B jumper
    -key on, see if SES flashes "12" three times
    -if no flashes, check for ground at ALCL connector pin A

    "did a little rewiring" can be scary...
    ...
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