Looking for opinions on what potentially is the problem with my 306 that has maybe 1500 mi. on it. I statrted it up a few days ago to go on a cruise and then it happened, out of the blue, without warning. Knock Knock Knock. It isn't a lifter knock, it is like a VERY solid and rattling KNOCK KNOCK as if someone is hitting the inside of the block with a ball peen hammer. Not terribly hard or violent, but a good solid sounding knock. I don't know if something has come loose internally or what? At first, due to the rattly noise, I thought a motor mount or something on the outside was loose, but have found nothing externally, so I convince it is an internal problem. The car will statrt and run, but obviously not wise to let it run this way due to possible collateral damage from doing so. I pulled the valve covers and all rockers are solid and push rods are tight. Just looking for some ideas before I really start to disect this motor, which upsets me to do since it is such a fresh engine.
All ideas appreciated.
All ideas appreciated.