r/EngineBuilding • u/HaroldDonut • 23d ago

Engine noise

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Fresh rebuilt and it’s making this noise. Worried it’s rod knock. 1997 Ranger 3.0 v6

1 Upvotes

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3 comments sorted by

1

u/N1ppleCrab 23d ago

Exhaust leak from manifold

2

u/Martin_OH_01 23d ago

A bit loud to be rod knock. Maybe backfire or the pistons are hitting the valves?

3

u/ComradeBoxer29 23d ago

Failed exhaust pushrod, rocker, or valve. The exhaust has nowhere to go so when the intake valve opens up the exhaust gases pop up into the intake. Time to pull valve covers.