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  1. #1

    Default Got the 97 Sub SLT fixed...strange

    Ok so I posted earlier that my 97 Sub would not start and was producing a "heavy crank". Turns out the Cats went out and apparently literallly melted the O2 sensors.

    So I replaced the O2s (both) and also went with a magnaflow Cat forward instead of an OEM. This provided me better low end and was actually cheaper. My real question however is WTH caused the O2s to melt? I am running a hypertech (have it stock now) but other than that I cannot figure out what would cause this.

    Any ideas?

  2. #2


    Pre cat or post cat O2's or all 4 that melted?

    I've heard of many cases where there is a lot of excess fuel in the exhaust that causes cats to literally glow red from the heat. Excess fuel also plugs cats up. So I expect that they just got that hot as they plugged up.

    Any sign of the engine running rich now, or signs of excess fuel in the exhaust stream?
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

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