So I found a used LSJ from a wrecker yard and am going to put it in my car to replace the engine that's been misfiring. But the guy at the shop is worried that the engine is really dirty and might cause problems. He thinks that someone came in before and picked off the intake manifold, and the guys at the yard didn't plug up the holes or anything so dirt/dust got inside.

Is this something a seafoam treatment can flush out without taking the whole thing apart? Or how's the best way to go about that?

 

If that's the case then over the shelf cleaners won't cut it. The engine will need to be disassembled and the block will need to be hot tanked to clear out any contaminants and rust from all the coolant/oil passages.

 

Why not figure out why your engine is misfiring before replacing the whole engine..lol

 

Exactly.

 

You think you're just gonna throw an LSJ in your TC and fire it right up?

 

Probably posted in the wrong section

 

Yeah, I just realized that. If anyone sees this and can move it, that'd be great.

New engine is already paid for, picked up and at the shop waiting to be put in.
When I originally took it in thinking it was an injector, that's when they did the compression test (no leak-down for whatever reason) and said cylinder 4 was misfiring. But they wouldn't be able to pinpoint it without tearing it apart and sending it to the machine shop, and said it would more than likely be cheaper to swap with a used engine rather than rebuilding for one cylinder since they'd end up doing all four anyway since it would be torn apart.

So I went to a few places in town, found this wrecked Cobalt sitting in the lot, and didn't inspect the engine as well as I should have which brings me to my current situation.

 

Find a new shop. How do they go from maybe a bad injector to we need to strip the block and start over. Sounds like the kind of place that will just keep throwing pats at the car on ur dime until it solves the problem rather than really diagnosing the issue

 

No no, I was the one that thought it was the bad injector. I swapped the plugs with no improvement, so that was my next guess. The shop I first went to did the one test which revealed the injector to be fine, but didn't really narrow it down beyond that. Which is why I took it to a second shop to do the swap. And once I got it there, that's when he looked over the new motor and said I overpaid, said he's gonna try and clean it out with some kind of solvent or something. But didn't mention taking it apart or anything.

 

I see you had a compression test .....what did it show? If it showed low compression (like I imagine it did) it could be something simple like a tweaked valve or something less drastic then a ...new to you.... engine .

 

I do beleive the engine that you bought is gonna be more trouble then its worth..I think the money you put into the new engine..you could of fixed your current engine..

 

Do people not have friends or family to give them good advice anymore? If you were my friend, i would have totally advised you to not buy an engine...gl, either way