Pinging from a 350 Chevy

Discussion in 'Trucks and Trailers' started by siklid1066, Apr 23, 2008.

  1. siklid1066

    siklid1066 LawnSite Member
    Posts: 148

    What causes pinging from a motor, if I use a higher octane its not that bad.But the higher the octane the more it costs.
     
  2. jkason

    jkason LawnSite Senior Member
    Posts: 548

    You hit the nail on the head. Octane.
     
  3. IA_James

    IA_James LawnSite Silver Member
    from Iowa
    Posts: 2,592

    Octane is a measure of resistence to detonation, also known as pinging. Detonation is caused when cylinder temperatures reach a point high enough to cause the fuel/air mixture to ignite before the spark arrives. Makes stuff rattle around, causes power loss, decreased efficiency, and allowed to go on long enough can cause internal engine damage. A basic tune up might help (properly gapped new plugs, wires, cap, rotor) but more likely your engine needs to have the timing set on it. If that doesn't do it, you may have cooling system issues that are causing increased engine temps that may permit pinging. What 350 is it? TBI, Vortec, carb?
     
  4. Lawn-Sharks

    Lawn-Sharks LawnSite Senior Member
    Posts: 912

    what year is your truck? Is you truck fuel injected or carbed? Are you using E85?
     
  5. siklid1066

    siklid1066 LawnSite Member
    Posts: 148

    94 350 fuel injection
     
  6. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Posts: 2,513

    Excess carbon buildup could be a culprit as well.

    90's Fords were notorious for carbon buildup.
     
  7. Lawn-Sharks

    Lawn-Sharks LawnSite Senior Member
    Posts: 912

    Whats the temp guage reading? (210)
     
  8. IA_James

    IA_James LawnSite Silver Member
    from Iowa
    Posts: 2,592

    205-210 being what it should be, not necessarily what it is.
     
  9. Bill M

    Bill M LawnSite Member
    Posts: 36

    Could be EGR issues also. The GM's coolant temp is 205-210 from the factory, get a 195 thermostat and a fan switch. Make sure the timing has not moved. Yes the higher octane costs more, but only $1.00 or so per tank. Replacement engines are not cheap, so that extra $1.00 for premium fuel may not be that bad.
     
  10. siklid1066

    siklid1066 LawnSite Member
    Posts: 148

    How do I get the carbon out can it be done without a(Motor Vac)or is this the best way.
     

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