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Old 07-08-2009, 01:26 PM   #9 (permalink)
wagonman76
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Join Date: Jun 2008
Location: Northwest Lower Michigan
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Red Car - '89 Chevrolet Celebrity CL 4 door
Team Chevy
90 day: 36.47 mpg (US)

Winter Wagon - '89 Pontiac 6000 LE Wagon
90 day: 28.26 mpg (US)
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I have read that a large cause of carbon buildup is through the EGR. Some guys put in a blocker plate so the computer still thinks things are normal. Can always take the plate out for emissions testing. It might put out a little more emissions with no EGR, but then again a carboned up engine would likely put out more emissions too.
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