knock knock under the hood
I've got a slight knock in my trailblazer. I've
heard a number of things, such as the fan
clutch, the serpentine belt. Where I
remember, if you hear a knock it's in your
block. Is this an easy repair or what should I
do with it?
Remove the serpentine belt and "briefly" start your engine. If the knock is gone the tensioner is the likely suspect. If the knock remains it is possibly an engine issue such as a rod bearing or a camshaft valve train issue, You may need to replace the engine is the knock is from any internal parts. Exhaust leaks from loose or cracked exhaust manifolds can sometimes sound like a knock.
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