Engine Knocking 1999 Tahoe


Asked by BlaccBaby00 Aug 03, 2020 at 03:54 PM about the 1999 Chevrolet Tahoe LT 4-Door 4WD

Question type: Maintenance & Repair

I recently had some issues with my tahoe running
hot and found out it was the water pump but i
continued to drive it adding water before leaving
each time. Finally got it fixed and now my motor
knocks while sitting but more so when
accelerating. Any ideas what's going on?

5 Answers


When an engine is severely overheated the oil gets very thin, like water, and is ruined. Change your oil and filter immediately! If the knocking persists the bearings in the engine are damaged. Not a cheap fix and, unfortunately, not worth the expense on a vehicle this old. Hope that helps! Jim

1 people found this helpful.

I checked all of the symptoms for thrown rods or blown head gaskets or cracked head. For instance no white smoke no bubbles in the water in the radiator no milky substance in the oil cap nor the oil stick no exhaust leak nor sweet smells no coolant smells and its no longer is running hot at all. Its just knocking but the oil idea i havent tried i just added more oil because I've recently had an oil change but will do it again. Any other ideas the motor is also shaking a little harder than usually

1 people found this helpful.

You can try a heavier weight oil when you do the oil and filter change but if the knocking continues after the oil change, the damage is done. Without proper lubrication the bearings will grind away against the crankshaft causing excessive clearances between the two. That's why you hear the knocking sound. In a short time you will throw a rod if the knocking continues. Hope that helps! Jim


You continued to drive knowing water pump was bad , now you hear noise from engine . Turn the radio UP so you won’t here it, and it will take care of itself SOON,

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