thank you so still not positive if its a 3.1 or 3.4 lol Ha like what I would image a crank position sensor not used on my car and some wires that are cut off in the front above the water pump

 

If it's got wires cut off by the water pump, then it's probably a 3.4... Those wires are for the 24X ignition crank sensor on the back of the damper, which 2.8s and 3.1s didn't have.

 

I thought that the upper intake off a 2.8L was indeed different?? Or is it just the TB only? Thanks for the correction mav.

Are any of those crank brearings noched up?? Can you feel the wear marks on them with your finger nails??

What do the cam bearings look like???

 

I might have been mistaken, but I thought project89 was referring to the lower intake...

The upper plenum and TB are different on the 2.8 as well as the fuel rail, everything else is identical (except for some reason some 2.8s have silver rocker covers while the 3.1s have black?).

 

this is almost correct , the 3.1 lower manifold does not have the air passages in the base manifold as the 3.1 system bypasses air around the throttle blade for idle control

the reason the 2.8 does not do this and feeds air directly into the manifold base is that the idle air passages feed into the cold star injector passage to feed air and fuel directly to each cyl

using a 3.1 base on a 2.8 engine will not let it idle/warmup correctly, u would have to use the 3.1 ecm and fuel rail along with the manifold base on a 2.8 for it to work


and to the op, that motor is beat up ur much better off finding a running 3.4 out of the junkyard and dropping that in to replace the burnt up engine , it will be much cheaper in the long run

 

Then explain to me how I ran an engine, 3.1 from a 91, that was stock except for the fuel rail, upper plenum, and TB, for 7 years on a 2.8 ECM? I merely knocked the 2 plugs out of the manifold and put the CSI parts into it. I did not have the idle air bypass parts for quite a while, granted, because the factory pipe was damaged (came unglued at the large T joint) and had to make my own, and it ran fine with or without the idle air pipe.

The 3.1 LIM uses the same idle air passages for PCV ONLY instead of both idle air AND PCV.

 

Camshaft bearings
most the copper looking coating is worn off.

Sensor above Water pump next to Engine number. Not used in my set up, appears to of had two large wires or 4 small grouped 2 and 2.

 

ill have to grab u pictures out of my photobucket but the 3.1 lower most deff does not have the iac passages that the 2.8 lower has

 

@ OP, personally i would go look for a junk yard engine or something if your up for the quickest, lowest price fix. Not that rebuilding the engine is too bad of work, its just that if $$ has anything to do with it then the yard find will be the most cost effective, as long as you find a good engine.

If not then just get a good hyper piston set, some new moly rings, and hone out the cylinders. Take the block in to get the freeze plugs replaced/and cam bearnings. Also to get the pistons installed onto the old rods. If the other bearnings arent bad then resuse them.

The only issue that will be needed done is to get a good idea if the cylinders are egg shaped or worn out. I tried to do that myself when I broke my piston ring and my measurements said that my cylinders needed bored out. Now since there is so little amount of error in that measurements allowed, I didnt trust myself and the way I measured it. SO that along with the fact that I found another engine dirt cheep, is the main reasone why I just got another engine insted of going with the complete rebuild process.

One more thing when you took out the lifters and the cam, did you mark which lifter came out of each boss?? Or did you just take out all the lifters and not mark them? The reason being, is that you must put those lifters back in the same exact holes that you took them out of as the lobes on the cam are specifically warn into there according lifter.

 

thanks fasteddi, I did mark the lifters in separate bags in case I reuse this block.

 

 

The cylinders are cylindrical except the one with the broken piston, has metal added to it in a spot.

I am giving up on this car, bad engine, rusted body = all bad. Very small budget for my next beater. But looking 2nd/3rd gen. Would like to get T-tops again.
I see a 84 gold firebird suposed to be all original. I know it has a carb and a choke light on.
Vin number says LG4 305

 

Heads up, the LG4 is gutless. But if it runs good and you like it thats all that matters.

https://www.thirdgen.org/1984-pontiac-firebird

 

sounds like a 78 with a 6.6L 400 would be less "gutless"