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Old 08-05-2003, 10:17 PM
psfred psfred is offline
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Chances are you are running a bit lean -- this means higher combustion temps and hence a little more NOx. I'd say you needed to clean the EGR, but you (thankfully) don't have one.

Check for vac leaks -- at this age, ALL the rubber hoses on the engine are suspect, plan on replacing all of them, including the crankcase ventilation restriction. Don't overlook the idle control valve hoses.

Peter
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