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Thread: fuel pump relay constantly switching

  1. #1
    Member
    Join Date
    Jul 2005
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    61

    Default fuel pump relay constantly switching

    the other day i flashed a tune into the pcm. 99 f-body pcm. at the end of the flash, when the pump would prime the relay stuck in a cycle switching on and off. i shut the car down, did a reflash, and now it does it all the time. i've tried 3 relays and a new fuel pump, thinking maybe it was the pump that died causing this since its 5 years old now.

    is there a way to check the signal from the pcm? or recover it?

  2. #2
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Either you misflashed, or the PCM died...

    Were you doing a full flash or a cal-only flash...?

    What or what change(s) were you flashing in...?

    I would try to do the flash again.

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