knocking sound

[Ernest2700]

My engine knocks from idol to about 3000 rpm's is that a rod issue or motor mount issue?

if its a rod anyone have an engine they want to sell? i got an s13 so do me one better.

[Gabes13]

If it were a rod, Im sure you would hear it throughout the entire rpm range.

[bmxer300zx]

i just rebuilt my 93 300zx due to the same thing it would only start knocking between 2500 to 3000 rpms i yanked the engine to find the prob and first thing i checked was the rods and come to find out it was the #1 rod bearing.it all depends on how bad it is my bearing wasnt destroyed but was def worn.so i have it all back together and iv had it t 5 grand nd havnt heard a peep. id def figure it out before it gets bad.but goodluck

[bmxer300zx]

if its a rod anyone have an engine they want to sell? i got an s13 so do me one better

lol i just read this .if i were u id just rebuild it i mean u gota yank out the engine to put in another one not knowing the condition of that one and could run into the same prob in a couple o months.id just yank it and for the 500 to 1000 you spend on a diff engine u could just get new bearins gaskets t chain and even piston rings if ur feelin real frisky.but seriously rod bearings for my 300zx ran me 150 and it was easy u just gota pay attention to torque specs .but still its all to what u wanna do but the rebuild route is good cause youll also learn about your car.

[Conquerer]

if its a rod anyone have an engine they want to sell? i got an s13 so do me one better.

Why would A-Rod be there?

[pj]

sure its not pre-detonation? could be a timing issue? i sa y this because its only at low rpm. just throwing a guess out there

[Ernest2700]

So bearings huh? I will get it checked asap! thanks so much for the input. I new with imports i had a jeep wrangler that was all decked out for off-roading and the 12 mpg's got to be too much. So i got the 91 240sx that I love but i just gotta fix up a bunch.

[S13Joe]

So i got the 91 240sx that I love but i just gotta fix up a bunch.

LOL, dont we all........

[TheFallOfJeffrey]

Why would A-Rod be there?

Lmfao

[tercel drifter]

get a oil sample done most heavy duty shops have them like kennworth or international idk just try and truck dealers

the oil sample will tell u if theres excess of brass or tin meaning which could determine if ur bearings are gone without overhauling it.

and its pretty cheap like 25$