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Corvette C4 Forum 1984 through 1996

Dirty Runners and Intake.. What to check?

  #1  
Old 02-09-2015, 12:23 PM
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Default Dirty Runners and Intake.. What to check?

Guys,

I pulled the intake manifold off my '87 to fix a seeping gasket. The car was running great before this, just leaking a little coolant.
The intake runners were exceptionally soiled and when I pulled the intake, ports #2 and #3 were really dirty. I could physically wipe the sludge from the port. It was heaviest where the runners meet the mani.

Obviously, something is wrong but I'm not sure what to check at this point.
My first thought, these ports are where the coolant leak was and causing extra carbon build up. Any suggestions on what needs to be double checked, extra cleaned, etc...?
 
  #2  
Old 02-10-2015, 11:54 AM
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Default bump

bump!
 
  #3  
Old 02-11-2015, 02:50 PM
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Welcome to the forum.

Most likely what you're seeing on the intake runners is caused by reversion. It is caused by gases that are kicked back into the intake during the overlap period when both valves are open. You will probably see this inside the throttle body also.
 
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