Question about 1993 GMC Suburban

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My 93 GMC Suburban has recently started to sputter and act like it doesn't want to go as fast as quick as it use to.... What is wrong? It kinda shakes a little when idling

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I assume it is a 5.7L V8, LO5 RPO. I would start with diagnosis of a misfire, Autozone can do this for free with a scan tool. Second, spark plug wires are notorious for degrading with heat over time--may be a wire. First, get it on a scan tool and see if you can identify the cylinder that is misfiring, and check the wire and or plug in that cylinder. You can always shut the vehicle off and remove one wire at a time, start the vehicle and when you come to the culprit, when the engine will not change its idling characteristics---and you found the cylinder by process of elimination.

Hope this helps

(I am assuming it is in the engine firing with my above statements)

Posted on Oct 04, 2010

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  • theeatrain Oct 04, 2010

    Would that also make it louder?

  • danny mcwilliams
    danny mcwilliams Oct 04, 2010

    It would change the characteristics of the firing which may change the tone a bit, but not louder I would not think.

    Check the a.i.r pipes/hoses or check to see if there is an exhaust leak, or a leak in the e.g.r. valve area...

    Again get to an Autozone or Murrays or Advance auto parts and put it on a scan tool first --to eliminate a bunch of guess work.

    Again I am assuming it is in the firing....go to the auto parts store and have it scanned--for free!

  • danny mcwilliams
    danny mcwilliams Oct 04, 2010

    It would change the characteristics of the firing which may change the tone a bit, but not louder I would not think.

    Check the a.i.r pipes/hoses or check to see if there is an exhaust leak, or a leak in the e.g.r. valve area...

    Again get to an Autozone or Murrays or Advance auto parts and put it on a scan tool first --to eliminate a bunch of guess work.

    Again I am assuming it is in the firing....go to the auto parts store and have it scanned--for free!

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