Context: It been sitting the my garage for 1 year without running...


I can't figure if the sound is coming from the bottom or the head. but it come from passenger side front.

Update: The sound is happening when the engine is cold. Then when it's at it regular operating temperature, it's gone... then it's back the next time I start it cold...

Note1: When the car is halfway between cold and regular temperature, then the noise goes and come back randomly while getting it regular temperature...

Note2: If I rev it to 2000 rpm in neutral when halfway to regular temperature, it does the sound at the time it accelerate, then no more sound.... very strange to me...

Note3: I already changed the timing chain tensioner.

Anyone got idea?

 

Sounds like bottom end to me but it seems really fast which throws me. I would go buy a stethoscope. They're cheap and fantastic for pinpointing these sounds.

 

If you're noticing a change with engine temperature then I would think it may have something to do with the coolant system when the thermostat switches. Maybe the water pump or coolant control valve? Then again I could be completely full of crap cause this is just a wild *** guess.

 

Now the noise seem to be gone (haven't drive the car yet but it doesn't do it anymore when I started the engine this weekend at the garage...)

Very strange....