car shakes violently. help? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Krusty_s13 · 09-01-2008, 07:23 PM

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 · 09-01-2008, 07:26 PM

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 · 09-01-2008, 07:28 PM

yea all the time

burnsauto · 09-01-2008, 07:30 PM

sounds like ignition signal is breaking up on low rpms

Krusty_s13 · 09-01-2008, 07:35 PM

how would i diagnose this?

SoguRacing · 09-01-2008, 07:42 PM

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 · 09-01-2008, 07:45 PM

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

SoguRacing · 09-01-2008, 07:46 PM

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

Krusty_s13 · 09-01-2008, 07:47 PM

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

SoguRacing · 09-01-2008, 07:52 PM

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** · 09-01-2008, 07:58 PM

Quote:

Originally Posted by Krusty_s13

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 · 09-01-2008, 07:59 PM

true. but i dont have a timing gun.

Krusty_s13 · 09-01-2008, 07:59 PM

Quote:

Originally Posted by West

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** · 09-01-2008, 08:09 PM

Quote:

Originally Posted by Krusty_s13

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 · 09-01-2008, 08:13 PM

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 · 09-01-2008, 08:29 PM

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 · 09-01-2008, 08:31 PM

^^^^^^^^^

i agree with RDM

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

Krusty_s13 · 09-01-2008, 08:35 PM

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.

09-01-2008, 07:23 PM	#1
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	car shakes violently. help? 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?

09-01-2008, 07:30 PM	#4
burnsauto Post Whore! Join Date: Dec 2006 Location: 717, PA Age: 38 Posts: 3,324 Trader Rating: (6) Rides Gallery: burnsauto Feedback Score: 6 reviews	sounds like ignition signal is breaking up on low rpms __________________

09-01-2008, 07:42 PM	#6
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 38 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	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. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

09-01-2008, 07:46 PM	#8
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 38 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	should take about an hour to do. did it on my friends s13 kae and it worked wonders. cost 50 bucks. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

09-01-2008, 07:52 PM	#10
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 38 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	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. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

09-01-2008, 07:26 PM	#2
nocar,nomoney Join Date: Apr 2007 Location: Union City, Tennessee Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	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?

09-01-2008, 07:28 PM	#3
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	yea all the time

09-01-2008, 07:35 PM	#5
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	how would i diagnose this?

09-01-2008, 07:45 PM	#7
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	yea thats what im going to do. new plugs, wires, a cap and rotor.

09-01-2008, 07:47 PM	#9
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	if that doesnt do the trick ill look into the timing.

09-01-2008, 07:59 PM	#12
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	true. but i dont have a timing gun.

09-01-2008, 08:13 PM	#15
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	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

09-01-2008, 08:29 PM	#16
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 50 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	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. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

09-01-2008, 08:31 PM	#17
xplicit240 Zilvia Addict Join Date: Oct 2005 Location: Weird NJ! Age: 39 Posts: 723 Trader Rating: (0) Feedback Score: 0 reviews	^^^^^^^^^ i agree with RDM or might just be funny enough make sure those mounts are on tight! __________________

09-01-2008, 08:35 PM	#18
Krusty_s13 Zilvia Addict Join Date: May 2008 Location: Miami, FL Posts: 879 Trader Rating: (0) Feedback Score: 0 reviews	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.