knocking sound

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
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Ernest2700
Posts: 62
Joined: Thu Feb 05, 2009 1:18 pm
Car: 91 Nissan 249sx se

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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.


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Gabes13
Posts: 2385
Joined: Mon Mar 17, 2008 11:59 am
Car: rb20det s13
Location: St. Pete, Fl.

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

bmxer300zx
Posts: 177
Joined: Wed Jan 07, 2009 2:10 pm
Car: 1993 300zx dd
1992 toyota cressida rb20det swapped
Location: maine

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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
Posts: 177
Joined: Wed Jan 07, 2009 2:10 pm
Car: 1993 300zx dd
1992 toyota cressida rb20det swapped
Location: maine

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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.

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Conquerer
Posts: 319
Joined: Sun Nov 16, 2008 12:40 pm
Car: 1995 Nissan 240SX LE

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Ernest2700 wrote: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?

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pj
Posts: 1430
Joined: Sun Jan 30, 2005 2:58 pm
Car: 95 s14

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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

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Ernest2700
Posts: 62
Joined: Thu Feb 05, 2009 1:18 pm
Car: 91 Nissan 249sx se

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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.

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S13Joe
Posts: 1741
Joined: Tue Sep 09, 2008 9:50 am
Car: 92 Coupe

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Ernest2700 wrote:So i got the 91 240sx that I love but i just gotta fix up a bunch.
LOL, dont we all........

TheFallOfJeffrey
Posts: 71
Joined: Mon Jan 12, 2009 5:06 am
Car: 1990 240SX

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Conquerer wrote:
Why would A-Rod be there?
Lmfao

tercel drifter
Posts: 217
Joined: Mon Sep 24, 2007 2:48 pm
Car: sr20det s13

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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$


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