Rattle/knock sound

[Olstyl1972]

Hello guys,
I have a 1997 eclipse gst that I am getting going. It seemed to run fine with no strange noises then out of the blue only going about 15-20 mph in the neighborhood the front wheels screeched stopped amd killed the motor. I instinctively pushed the clutch in and rolled to a stop expecting to see a puddlenof oil underneath and pieces on the ground. Opened the hood and everything there and under the car looked good. Checked the oil and it was in range and looked normal. Hit the key and it started right back up, but now when you give it any throttle it makes a knock/rattle sound. At first I thought maybe a soun bearing but it doesn't make the noise at idle or just a tiny bit of throttle. Only when you give it enough throttle to move. If you just let it sit and idle it purrs. Any ideas? I know my way around a 350 chevy, but I'm new to these cars and don't want to go tearing into it if it's something simple.

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[tschuhly]

I'm curious if you jumped timing (timing belt slipped). That definitely sounds like internal knock since it seems to match the engine RPMs.

 

[Tony1094]

Sounds like valves kissing pistons to me.

 

[Vladimir]

You can do vacuum test to check for fluctuation to see if the valves are sealing. Also a compression and leak down test. When valves get bent you usually loose compression and ability to run smoothly or at all at any RPM.

Was it raining that day? Could you have possibly hydrolock it? Did you work on your car prior to that, and possibly had something fall in the intake? Is your oil pressure the same or low? What were the variable engine ETC, condition etc..... does it come from top end or bottom ?sounds like rod knock more than anything to me. Also if you skipped timing you should likely get crank angle/correlation codes