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Carbon in the intake runners...

Discussion in 'The Garage' started by BigBurban350, Jun 18, 2005.

  1. BigBurban350

    BigBurban350 1/2 ton status

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    What is the diagnosis for carbon build up in the intake runners?

    Before the valves and even a little in the intake manifold. Note' This a non-egr engine.
     
  2. BigBurban350

    BigBurban350 1/2 ton status

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  3. sled_dog

    sled_dog 1 ton status

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    valve seals would be my guess. Little oil or oil vapor leaking into intake runner.
     
  4. BigUglyracing

    BigUglyracing Registered Member

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    If I remember right. It is reversion. Unburned fuel in the intake tracts.
    If you need more info i think i may be able to find some.
     
  5. BigBurban350

    BigBurban350 1/2 ton status

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    I am putting new heads on and actually going to tune the fuel injection system this time (eprom programming). I mean even the combustion chambers were caked with carbon. This engine has only 1,500 miles on it.
     
  6. BigUglyracing

    BigUglyracing Registered Member

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    What tire size / what gears are you running?
    Have you been lugging the engine.
     
  7. BigBurban350

    BigBurban350 1/2 ton status

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    35" and 4.10 gears on a big ass suburban. I didn't really tune the fuel injection, just added 454 injectors into the 350 TBI unit. My A/F guage said it need more fuel, although I was only using a 1-wire oxygen sensor at the end or full length headers.

    I figure richer is better anyways, we'll see what happens with some new heads and a tuned computer chip.
     

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