car shakes violently. help?

[Krusty_s13]

so i got this fastback. its a 92. dohc ka. prev owner said it has nismo mounts, i cant confirm that. at idle the car shakes like it has a bigblock in it. once i bring the rpms to about 1500 it stops shaking. any ideas?

[nocar,nomoney]

sounds like you got a big cam, or a miss that pick up after so long, mine does it every once in awhile, does it do it all the time?

[Krusty_s13]

yea all the time

[burnsauto]

sounds like ignition signal is breaking up on low rpms

[Krusty_s13]

how would i diagnose this?

[SoguRacing]

get a new cap and rotor, new wires and plugs, check the vacuum hoses and verify that your timing is correct. should fix your problem.

[Krusty_s13]

yea thats what im going to do. new plugs, wires, a cap and rotor.

[SoguRacing]

should take about an hour to do. did it on my friends s13 kae and it worked wonders. cost 50 bucks.

[Krusty_s13]

if that doesnt do the trick ill look into the timing.

[SoguRacing]

well, you should check the timing first. why? because it's free if you already have a timing gun. also, you may have a leaky injector. but 50 bucks for a tune up is cheap and should be done anyways.

[West]

nismo mounts

Thats your problem. I havent used those mounts before, but a busted mount will cause your shit it shake madly at idle.

[Krusty_s13]

true. but i dont have a timing gun.

[Krusty_s13]

Thats your problem. I havent used those mounts before, but a busted mount will cause your shit it shake madly at idle.

you think?
those mounts look brand spanking new.

[West]

you think?
those mounts look brand spanking new.

Then that just might be the nature of those mounts. Anyone else have them and can contest?

[Krusty_s13]

id love to find out.
also, the cars shifter is very sloppy.
i put it into first and it looks as though its in neutral?
the prev owner told me its a bushing. i havent looked into it

[projectRDM]

Nismo mounts aren't any stiffer through the chassis so there's no reason to think that's the problem. Besides, a stiff mount would cause NVH throughout the rev range, not just low speed.

Vacuum leak, incorrect timing, or a misfire is the culprit.

[xplicit240]

^^^^^^^^^

i agree with RDM

or might just be funny enough make sure those mounts are on tight!

[Krusty_s13]

ill check it out and update.
ill be doing a tune up and ill check for vacuum leaks and the timing. my old man says he has a timing light. and ill check the mounts too.