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  1. #1
    Legend

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    Default Check engine light came on????

    My suburbans light came on when it was idling at the gas station when I came out it was on. I have noticed a slight chunky vibration (if that makes sense)over the last week or so. When I got to work, I opened the door to listen to the exhaust and it was like i had an old muscle car with a big cam and the note and 500 RPM was very chunky but the engine seemed to be running smoothly and power seemed fine while on the highway. I am getting the code read tomorrow but just wanted some opinions
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  2. #2
    Legend

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    Default

    Well its P0304, the oooooold number four cylinder misfire huh! I reset the CEL and on my way home from oreillys it didnt come on, so after it cools I will do the norm I guess check the plug, wire and distributer. The distributer is only a year old, the wires have been on since I bought the truck and the plugs are two years. Other then that any suggestions???
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  3. #3

    Default

    That's probably where I'd start, too. Don't forget that it might also be a fuel system problem (in particular the #4 poppet valve might be going bad. They have been problematic).
    '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

  4. #4
    Legend

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    Default

    This is the first I have heard of a poppet valve
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  5. #5

    Default

    just change the wires and plugs you should be fine.
    Nothin like a liftd truck goin muddn

  6. #6
    Legend

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    Default

    I think poppet valves means regular car type valves. In older times there were sliding valves and all sorts of other ways to let in mixture and get out exhaust.They finally figured out that round valves/stems with a spring were the way to go.I think older valves spring steels broke frequently-hence the looking for other types of valves.

    Could be wrong on this,
    Charlie
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  7. #7
    Master Mechanic CarpenterGuy's Avatar
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    Leeds, Alabama
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    Default

    our old car did this and it turned out to be a faulty plug wire, so i'm bettin git has to do with your plugs/wires.
    2006 Silverado Z71 - 97,000 - totaled, RIP
    2006 Silverado Z71 - 122,000 (K&N 77 Series CAI, PowerAid TBS, Magnaflow dual rear exit, 33x12.50 Mickey Thompson MTZ, Tuff Country Torsion Keys, Tuff Country Add-A-Leafs)
    1966 C10 swb stepside (Gen I 350, Turbo 400 trans, dual cyl power brakes, front discs)
    I'll keep my money, guns, and freedom. You keep the Change.

  8. #8
    Legend

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    Default

    Hopefully some new wires will cure all
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  9. #9

    Default

    Quote Originally Posted by vncj96 View Post
    This is the first I have heard of a poppet valve
    Sorry, I get so used to this term, as often as it is discussed, that I forget that some people have no idea what a poppet valve refers to on these engines.

    The poppet valve mentioned is the type/style of fuel injector GM used on the late '90's CSFI (Central Sequential Fuel Injection) engines (small block V8's for the most part I believe). For whatever reason, these "injectors" don't wear very well. Of course, one symptom of a failed "injector" would be a misfire for that cylinder. GM has since redesigned the "injection spider" to use real injectors rather than poppet valves. I apologize for not explaining that in the first place.
    '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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