Shoutout to the old timer in Dayton who talked me out of a $900 parts cannon

Derek Brown · 2026-10-01T16:25:03.364992+00:00

I was dead set on swapping the whole fuel assembly on a 2004 Silverado with a P0171 code, but he told me to smoke test the intake first, and it turned out to be a $12 vacuum elbow behind the manifold. That was 3 weeks ago and the truck has not thrown a code since. What is your go-to cheap test before you start throwing parts at a lean code?

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Shoutout to the old timer in Dayton who talked me out of a $900 parts cannon | Auto Mechanics - Opinions Matter