my '89 n/a did that, i had a blown head gasket. but i knew that when i bought it. mine only knocked when i hit the gas, even lightly hitting the gas. then one day i had a loud knocking noise that was louder than my sound system in my car. i went to school and put it on the car lift and listened, it was a rod knocking. i had to replace the crank and a piston. my guess it was quietly doing the same. if you can, get a something to liston around the oil pan, if you hear something knocking, its probably a rod. my knocking sounded like it came from the cams but it wasn't. hopefully you haven't destroyed your crank like i did. :huh:
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