If you buy an automotive stethoscope (5-10 bucks at AutoZone), you could use it to listen to you engine.
Place it on each valve cover first, then against the bottom of your engine block.
If the sound is louder up top, then it's in a cylinder head. If it's down low, it's a rod or piston.
Either way, your engine will have to be torn down to find the exact cause. But the parts and labor you'll pay won't be worth it on a motor with that many miles on it.
You'd be better off buying a used motor or rebuilt motor and having it installed. In the end it'll probably only cost you a couple hundred more.
Wednesday, April 28th, 2010 AT 8:22 AM