Just as the title says. I'm buying a 92 firebird with a 3.1L v6 and it has a knock in the lower-end of the engine. I have no clue what it could be. I go pick up the car tomorrow so any help will be great!

 

I'm 99.9% sure it will be a spun rod bearing. If it is, then you will be looking for a motor, or doing some major engine work. Either way, the motor has to come out of the car.

 

Not worth rebuilding, find a used 3.4 or 3.1, or even a 2.8 if you don't care about power, but for an engine this common rebuilding isn't cost effective unless its for more power and upgrades. I got a 3.4 for $200, complete with wiring harness, and even the torque converter, and all accessories. Or you could find a used crank or rods, but if you're lucky it might just be a bearing, and not whatever attaches to it.

 

I have a good 3.1 crank and rods, but the pistons that are on the rods aren't the greatest. If you want them, I'll sell them to your for $75 plus shipping.

 

would i be able to buy another 3.1 engine with jus the block, rotating assembly, heads, and oil pan can i swamp everything like intake, and accessories from my current engine and put the new one in using the original harrness and ecm and all that good stuff?

 

yep, you'll be fine doing it that way.

 

Yes you can do that, but the new motor HAS to be a RWD block.. It can't come from a FWD car or van.

 

good because at my local pull-a-part there was like 5 third gen camaros and a 92 firebird jus like mine. all with 3.1L v6's in them

 

I would just get the whole motor, the lower intake, the plenum and everything. If you do and you are interested in selling one of the intake sets, from the lower intake up I would like to know. I need another one and no junkyards around here have a V6 thirdgen.