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Discussion Starter · #1 ·
i have a 91 silverado and my egr valve is goin out, i'm wonderin if not replacing it is goin to effect my gas mileage any?
 

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HOT AIR BALLOON OWNER
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If you don't swap it you'll have to deal with a constant check engine light. Econ may drop as you won't be able to have as much advanced timing.
 

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Discussion Starter · #3 ·
yeah i've already been thru that ordeal about the light, but how do i know if i need to swap out the valve itself or the switch or the sensor?
 

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HOT AIR BALLOON OWNER
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Have to test the unit. Either with voltage to the unit, ohms, or if it holds vac.
 
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