Knocking heavy and hesitating while stopped
Have you checked the oil level?
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If there is “heavy knocking and hesitating” at idle, I very seriously doubt adding oil will help–though I’d still top it off if low. To put this in perspective, my Sundance with a worn out rod bearing, and a crankshaft journal that was ovaled out to the point the I could wiggle the connecting rod around the crankshaft was barely audible at idle speed, and only made noise under load.
If this is anything more serious than preignition/spark knock due to low quality fuel, it sounds like you will need major repairs.
I know it’s probably to late to add oil, but if he checks and there isn’t any, we have a good idea of what the problem is.
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