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2001 Silverado 5.3 Secondary Air Injection Check Valves
Posted to Technical Theory Forum on 9/24/2018 7 Replies

Every 2 or 3 years, the check valve blows out and trips a code. I think the last two times it's been on Bank 1, but before that it may have been Bank 2. The valves are rusting inside, and I thought it may have been from around town driving and moisture not bur... Login to read more.

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