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Old 12-29-2001, 07:29 AM
Posts: n/a
The NO readings are way out of whack. If i remember way back when I took my emission class this is controlled by the EGR valve. (Cylinder combustion temp too high.) The EGR cools the combustion chamber. This valve opens under acceleration and allows the burnt exhaust gas to pass into the combustion chamber and be re-burn and also lowers the temp of the cylinder (under 5000 deg) . The high temp (over 5000 deg) adds extra oxygen to the nitrates. It's been 20 years I might be remembering it wrong. One of you young tech's correct me if that the case
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