2G Weird knock coming from top of engine?

[John Mark Dongon]

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.

 

[ThunderChild]

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.

 

[AWD-Tony]

I'd say check all the mounts and brackets to the engine, BUT your post is a little confusing. It goes away when it reaches idles???

 

[DSMPT]

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.

 

[John Mark Dongon]

Heres a video

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[jakk220]

Definitely a weird noise. Hard to tell exactly what it resembles in a video. It almost sounds like your radiator fan blade hitting something intermittently.

 

[John Mark Dongon]

Definitely a weird noise. Hard to tell exactly what it resembles in a video. It almost sounds like your radiator fan blade hitting something intermittently.

Its something in the engine cause I can feel it hit when i put my hands on top.

 

[AWD-Tony]

What happens when you increase the rpms?

 

[AWD-Tony]

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.

 

[John Mark Dongon]

What happens when you increase the rpms?

when i increase rpms the knock isnt as consistent but gets much louder when it does knock

 

[AWD-Tony]

Did this just happen all of a sudden? Or was it a result of something/repair/mod?

 

[John Mark Dongon]

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.

I rebuilt the whole engine

 

[AWD-Tony]

Put your hand on the valve cover and see if you feel it over each cylinder. Wonder if it’s a valve sticking or hitting the piston. I’d check compression also.

 

[BLACK'98DSM]

@John Mark Dongon Why are you selling it?

 

[John Mark Dongon]

@John Mark Dongon Why are you selling it?

Keep running into new problems after I fix one, if money wasn't a issue I'd keep it, I still haven't figured out what the knock is but after driving it the knock goes away