Weird vibration at idle

[Starlet-supra]

im not too familiar with the ep82 starlet's since they never came into Canada and this one is my first one, however i would like to apologize for my stupid question if it may be. Anyways ever since i got the car, i have been reading on the forums quite a bit about them, mine is modified a little bit, but not alot. Its got some japanese full exhaust system, and an HKS intake, thats all that has been done to it. Anyways ever since i got the car i noticed that it has a weird vibration at idle. The idle is at 700rpms exactly like factory and as soon as its idling the whole car is vibrating, i mean i can feel it through my seat and on the floor boards how all of the car is vibrating. Soon as i increase or raise the idle with the accelerator it goes away and runs smoothly, or soon as i turn all the lights on my idle increases by maybe 75rpms and the vibration goes away. Im just wondering what the issue is here, because i am positive that this vibration is not normal, im just wondering what the main cause of this is, and if its common on all the ep82 starlets??

 

[dac69er]

idle speed is too low. do you have polyurethane engine mounts?

they do tend to vibrate a bit on idle, even more so with solid engine mounts.

raise your rpm to about 850rpm

 

[Rev]

x2 Just turn the idle up using the idle adjustment screw on the top of the intake manifold. ( under the rubber grommet. ) Stock I thought is 750 rpm so it sounds like yours is a little low. Usually maintenance items can effect the idle a little. Oil not filled or getting old , air filter, spark plugs , distributer rotar worn or salty, dirty alternator fuse etc.

 

[dark_knight]

engine mounts maybe. have you checked those..? there are 3 of them. one on the engine (belt-side), two on the transmission..

 

[Starlet-supra]

thanks for the reply's. i will definately check those today. And does anyone have a picture of the exact location of this idle screw that i can find???

 

[dac69er]

thanks for the reply's. i will definately check those today. And does anyone have a picture of the exact location of this idle screw that i can find???

look at the inlet manifold throttle body end. its a brass coloured screw that sits in a hole that points up. you cant miss it as its the only adjustment screw other than the throttle stop

 

[Starlet-supra]

ok thanks what should i bump the idle up to?

 

[dac69er]

As per my 1st post. Put it at about 850rpm