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  1. 09-26-2022 #1
    Stevemoravsky
    Stevemoravsky is offline
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    TBI BACKFIRE

    95 chevy g20 5.7L tbi 4L60e
    Tbi backfire about half way down on pedal under load only. No backfire at all in P/N at any rpm. No codes. Vacuum good. Compression good. Timing 0° btdc base idle. Advances to 20 btdc with EST.
    New distributor. Fuel pressure 12psi at tbi. All sensors appear to be working fine. New wires.
    Using 1320ELECTRONICS obd1 scanner. Cat removed. New muffler. No smoke out tail pipe. Not over/underheating. Shell 93 octane. Help?
    Last edited by Stevemoravsky; 09-26-2022 at 04:20 AM.
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