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Old 12-03-2009, 12:13 AM   #1
aa4lr
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1999 SL2
Default Carbon behind throttle, intake manifold

I recently cleaned the throttle body on my SC1. It had about 1/16 inch of carbon build-up on the back side of the throttle. There's a similar amount of carbon all in the intake manifold.

I have two questions:

1) What causes the build-up of all that carbon? Could it be accelerated by a bad ECTS / bad thermostat causing the PCM to run super-rich?

2) How does one best clean out the carbon build-up in the intake manifold? Or does this not affect the engine much?
...
Bill Coleman
2001 Saturn SC2 Auto (3/13-...) "Yellow"
1999 Saturn SL2 Auto (11/09-...) "White"
1995 Saturn SC1 Manual (9/08-...) "Gold"
1994 Saturn SL1 Auto (7/94-1/04) 144,000 miles "Green"
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Old 12-03-2009, 12:30 AM   #2
OldNuc
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1998 SC2
Default Re: Carbon behind throttle, intake manifold

The carbon crud is from the exhaust recirculation. It is made worse by the increased oil consumption. If you were running rich and cold then that will cause it to stick better.

If you want to clean it you have to remove the manifold and soak it in something like Purple Power till it all comes out. Its not causing any serious problems so you do not have to clean it out.
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Old 12-03-2009, 01:25 AM   #3
ttreibel
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2006 ION-2 Quad Coupe
2002 SL1
Default Re: Carbon behind throttle, intake manifold

I remove the throttle body and use a ruler with blue shop towels wrapped around it. Works to get at least some of the gooey crud out. I also remove the egr at the same time and blast compressed air through those passages. Once on the 95SLone I got it so clean took a couple days for the idle to balance itself back out after the clean.
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1995 SL1 oil burner school commuter looks nice...1997 SL1 Gold 5-speed with new junk yard wheels and tires just got 40.4 MPG....2002 SL1 sometimes 45 MPG on a spring highway drive
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