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Originally Posted by lakeman
Check the EGR valve, could also be timing, cat., converter or even O2 sensor. Check EGR first. High NO is indicitive of high combustion temps., and plugged EGR will cause this as will a lean mixture caused by a bad O2 sensor.
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Thanx for the info. I was told that this vehicle does not have a egr valve. Do you know if this is true? Thanks again.