Whats the diagnosis for carbon build up in the intake runners?
06-18-2005, 07:18 PM
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Car: 91' Pontiac Firebird
Engine: 388 ci Small block CHEVY (4.060x3.75), Dart Iron Eagle Platinum 200cc, Performer intake, 454 TBI, Long Tubes, True Dual 3" GPs
Transmission: 700R4, B&M, Governer Recal, 20,000 GVW cooler
Whats the diagnosis for carbon build up in the intake runners?
Whats the diagnosis for carbon build up in the intake runners?
Its before the valves and even a little in the intake manifold. Note' This a non-egr engine.
Its before the valves and even a little in the intake manifold. Note' This a non-egr engine.
Last edited by TWICEtheRICE; 06-18-2005 at 07:20 PM.
06-19-2005, 11:25 AM
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Car: 91' Pontiac Firebird
Engine: 388 ci Small block CHEVY (4.060x3.75), Dart Iron Eagle Platinum 200cc, Performer intake, 454 TBI, Long Tubes, True Dual 3" GPs
Transmission: 700R4, B&M, Governer Recal, 20,000 GVW cooler
I dont have a ridiculus cam, but I did buy a cheap timing set and didnt degree it.
I wonder if the engine was running excessively rich and the fuel puddled, and everytime the engine heat soaked baked the fuel....??? Just thinking to myself
I wonder if the engine was running excessively rich and the fuel puddled, and everytime the engine heat soaked baked the fuel....??? Just thinking to myself
06-19-2005, 11:30 AM
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Oil leaking past the intake valve guide/seal. Seen it many times. It'll also coat the back of the intake valve with crusty carbon. You would think it couldn't get very far BACKWARDS up the intake runners but it does- not quite to the intake manifold.
06-19-2005, 12:08 PM
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Car: 87' Iroc
Engine: 350
Transmission: 700R4
Carbon deposit or oil as Damon said?
The fuel/air charge actually comes back up the intake port then back down into the cylinder. It doesn't just go right in....that is why it is so far up the runners.
The fuel/air charge actually comes back up the intake port then back down into the cylinder. It doesn't just go right in....that is why it is so far up the runners.
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