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2G Weird knock coming from top of engine?

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John Mark Dongon

Proven Member
94
5
Feb 7, 2019
Stockton, California
It only happens when I step on the throttle as the engine runs harder, there's a single loud metal thump, similar to a hammer hitting the oil pan, from to under the engine. I doubt it's a rod knock cause its not constant, there's about a 3 second gap between each knock and as the engine slows down, the knock gaps get longer until it eventually stops knocking when the engine reaches idle.
 
That not good.

Does it sound internal (muffled/damped) or extrernal (sharp/pingy)?

Need to do some investigating for loose items banging around, and if it sounds like it's internal, might be a good idea to pull the pan and see if anything like a bearing is banging around in the balance shaft humps.
 
It could be the flexplate is contacting something. Remove the inspection plate and check if it is not contacting anything. And also make sure the transmission has all mounting bolts and the starter plate is in its position properly.
 
You should be able to find that noise since it’s consistent and loud. Put it on jack stands and try to pinpoint the general area it’s coming from. I’d check the timing side first. From the video, sounds like something is hitting plastic.
 
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