car shakes at idle

ONLY for ADVANCED technical discussion about the 240sx!
mike240sr
Posts: 132
Joined: Fri Oct 01, 2004 5:24 am
Car: 1991 240sx se with sr20det

Post

When I start the car it shakes real bad. With the hood open, you can really tell how bad it is. The shifter shakes real bad. do you have any idea's what it can be from. the RPM's stay the same for the most part

My only thought is that it is the like that all the time and i can feel it because it is completely stripped out.


fatboy
Posts: 294
Joined: Wed May 12, 2004 4:46 am
Car: s13

Post

is it misfiring?>

Nismo408
Posts: 22
Joined: Mon Sep 20, 2004 3:50 pm
Car: 1990 Nissan 240sx
Contact:

Post

Hey man, my car does the same shi* sometimes. On my car, its misfiring due to the face that my #3 injecter plug is ****ed up. Chek all your injectore plugs / wires and your spark pluges, spark plug wires and disturbeter too.

asbestos
Posts: 5
Joined: Fri Aug 27, 2004 8:34 pm

Post

you are probrably running on 3 cylinders

User avatar
themadscientist
Posts: 26254
Joined: Tue Nov 12, 2002 3:30 pm
Car: R32 GTR, DR30 RS Turbo, BRZ, Lunchbox, NSR50 Sportster 883 Iron
Location: Staring down at you with disdain from the spooky mountaintop castle.

Post

Close your eyes and ignore the shaking and listen to it. Does it sound like it is running properly? If it does sound right but is shaking you have a busted motor mount and the engine is just shaking because one side is not attached to the mount anymore. That is easy enough to confirm by grabbing the engine and rocking it from side to side. Now if it sounds screwy you likely have a dead cylinder. With the engine running start at #1 and pull the plug wire, CAREFUL! that can hurt if the wire is bad and the coil fires though you! If the engine runs worse plug the wire back in, that cylinder is ok. pull them all one-by-one. You are looking for a cylinder that when you yank the plug wire the engine's idle does not change, that's a dead one. pull the plug on that cylinder, plug it into the wire and lay it on it's side on the engine somewhere where it can ground out. Have a freind or an enemy or a leather-clad guy wrapped in saran wrap crank the engine. If the plug sparks it's good, well good enough. If it fires but seems weak observe a known good cylinder's plug fire and compare. If the plug is wet and black when you pull it out it ain't firing. If the plug is strong but clean or white listen to the injector on that cylinder, you should hear the clicking of the pintle solenoid. If you are getting no fuel you likely have a dirty or failed injector.


Return to “240SX Technical Forum”