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Old 02-18-2015, 09:12 AM   #6
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Join Date: Feb 2014
Posts: 530

1999 SW2
2002 L-Series 2.2L Sedan
Default Re: EGR blocked and drives fine...?

Originally Posted by ninetynineSC2 View Post
Correct me if I'm wrong but, can't having it blocked at highway speeds cause the combustion temp to be higher than it is meant to be which could possibly burn valves? I remember reading that on a couple older threads.
That is a risk and is common... a blocked egr is what we suspect to have caused a burned exhaust valve on our 97 sl2...egr was immediately replaced after the head was rebuilt ...Though on the other hand, if you look up 4.3 w code vortec motors and their pages of complaints with egr problems you'll see the simplest and best solution is to block it...which my blazer drove for over 70k with a block plate
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