![]() Does it happen when you are stopped and the engine is idling? When stopped and pressing on the gas does it increase, slow down or stop? Have you had exhaust work done lately? Many times people don't run the pipes properly and they will thump against something as you describe. You have not given much to go on to reasonably ascertain what would cause the sound you mention. Until the pump is really ready to go it only drips out when the engine is running. It starts out dripping slowly as the seal wears from the play in bearing's movement. If you have looked and looked and not found the leak. It has a weep hole and when the pump bearings are shot it will begin to leak to let people know to look for a problem. One thing many people overlook when looking for the source of coolant leaks is the water pump. Insofar as your leak goes obviously check your hoses for loose clamps any hoses that are dried out/cracking if they aren't leaking now they soon will be and the radiator. ![]() Good luck to you, and I hope this helped a little. What do your exhaust fumes look like? White smoke? Black smoke? White smoke could indicate that some of your coolant gets into the combustion area, while black smoke suggests excessively burning oil. Maybe get somebody to do a compression test and a leak-down test to see if your valves/rings etc. You can get a lot of info from that also make sure your oil and coolant levels are okay. Check your plugs and see what they look like at the business end. Here are a couple of sites that will tell you a bit more:Īs you can tell, there is a multitude of problems that can come with that noise. A low rumble or knocking noise could be caused by a bad rod bearing on the crankshaft. A quick steady tap may indicate lifters or cam lobe, while a clatter may be loose/worn rocker arms. ![]() If the noise is a steady metallic rap, it may indicate a rod/rod bearing. Some noise can come from a worn camshaft. If the noise you hear is a fast tap or clatter near the top of the engine, it could be valve noise which would require you to have some cylinder head work done. Sue, I'm not sure about your engine size, but the 3.4 engines are commonly known for intake gasket leaks and the 3.8 is known for the intake manifold going bad. ![]()
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