At idle, this noise is not present, but when you give it a little gas, it is shows itself. It sounds like a bearing with no grease.
I have owned this ody for about 6 months and it has always done it. I recently put a remanufactured head on it because i had a burnt exhaust valve and did not want to mess with the trouble of a machine shop. The head is nice and i adjusted the valves today and it idles pretty good for 200k miles. But, i cannot figure out this loud grinding noise.
I have replaced the timing belt, water pump, starter, radiator, thermostat, plugs, rotor, cap, wires, head, exhaust, and intake gaskets. changed the oil and filter today. changed the tranny fluid about 2 months ago.
this thing has been a real piece of work, but slowly it is getting where it needs to be. so, there ya go. i thought it was the main bearings, but it seems like it would be running like crap, or not at all.
I don't know at what rpm the noise occurs because i don't have a tach, but i would guess around 3k rpms.
thanks,
seeker311