suburban 95 5.7- engine is gone?

[eran tomer]

started while cruising and got worse.
it's hard to hear in the video but on idle it sounds like someone is striking with a hammer on a metal, and when pressing the gas there are loud explosions from the air cleaner.

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[Schurkey]

Popping out of the air cleaner likely means that an intake valve/valve seat are leaking. The combustion in the cylinder leaks past the intake valve, which ignites the air/fuel mix in the intake manifold.

There's other possible causes--none of them good. A failed head gasket could potentially do about the same thing, depending on which cylinders are involved.

Leaking valves and failed head gaskets are best confirmed with a cylinder leakdown test. However, a cranking compression test is sometimes enough.

First Guess: Heads get removed. Head gaskets get replaced. Time for a valve job.

My '88 K1500 did this a few years ago. Head gasket failed between #3 and #5. When the spark ignited #3, a jet of burning gasses blew across the blown gasket into #5. The hot combustion gasses blowtorched a gouge between the two cylinders in the block, and in the head. The block MIGHT be salvageable with significant machine work. The head will go in the recycle bin. The longer you allow the engine to run like this, the worse the damage will be.

 

[eran tomer]

A mechanic diagnosed without checking that it could be a low fuel pressure. Makes sense?

 

[PlayingWithTBI]

A mechanic diagnosed without checking that it could be a low fuel pressure. Makes sense?

It's possible but, I haven't heard lean pops that bad before. A simple check of your fuel pressure should tell you.

 

[Schurkey]

A mechanic diagnosed without checking that it could be a low fuel pressure. Makes sense?

No. That is not diagnosis. That is GUESSING. He may be right, he may be wrong, but it's nothing more than a guess.

Guesses are what you get on the Internet from volunteers. "Mechanics" get paid to actually inspect and verify things.

 

[eran tomer]

update- mechanic said he had to replace 2 rockers or something, no damage to the engine. now it runs like new. who knows if actually the rocker nuts just got loose.

 

[GoToGuy]

Wait, " two rockers or something?" Did you get repair documents?

 

[Erik the Awful]

I'd want to see how the rockers failed. If the pushrods punched through, I'd replace the lifters and pushrods as well.