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  1. #1

    Default 1997 5.7 liter Suburban.

    Why does my 1997 5.7 liter Suburban hesitate between 50 & 70 mph? Any thoughts would be great.

  2. #2

    Default

    check your egr??
    my old 94 burb did this and i found that the egr valve to bethe culprit.

  3. #3

    Default

    So many possibilities. Can you describe in more detail this hesitation? Does the SES light come on? Even if it doesn't, I might scan for codes and pending codes to see if the computer has anything to report. A fuel pressure test might also be in order, though you may have to set it up so you can monitor the fuel pressure under conditions that it hesitates. There's also the question of it being a possible transmission issue.
    '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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