I have a knocking noise when I start up and after 3
to 5min the noise goes away. It doesn't matter if is
cold or hot outside. Please give me some advice
on what to check for.
Is the knock in the engine bay or back of truck? 3-5mins on the engine is a long time and I would have it checked out ASAP. Check the oil level first. Any lights lit up on the dash, like a Check Engine light?
Have the oil pressure checked with a mechanical gauge to make certain you have proper oil pressure.
Also it is possible that you have an exhaust leak at the manifold that seals itself when the engine warms up and the parts expand.
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