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Typically the EGR valve is not the only problem.
If you'll examine the exhaust gas passages when you have the EGR valve out of the engine, you'll notice that an older vehicle typically has quite a bit of built up deposits on the inside of the passages. These need to be cleaned at least sufficiently to allow the free flow of exhaust gas.
Sometimes the cleaning process can be more time consuming than replacing the EGR valve.
And SOMETIMES, you don't even need to replace the EGR valve; the problem can simply be the buildup of deposits.
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You just replaced your head gasket on your 97 blazer and now you have oil in your carb is there anything else besides the PCV valve that would cause this?
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