This is a discussion on unknown vibration within the Internal Engine forums, part of the LSx Technical Help Section category; i'm having a pulsing vibration starting around 2100 rpm,have no idea what this could be,my car runs great,like a beast,but ...
05-04-2009, 05:03 PM #1
i'm having a pulsing vibration starting around 2100 rpm,have no idea what this could be,my car runs great,like a beast,but the vibration is really bad.
doesn't seem to affect performance,i've checked mounts,motor & transmission. i can rev it in neutral or park,like i said it starts just above 2k rpm. it isn't a constant steady vibration,it seems to pulse,like some kind of cycle. does anyone have any ideas,this is driving me kra-z.
05-05-2009, 12:43 PM #2
I have this too and have been trying to figure it out for a couple months now, although I don't think it's an internal engine problem
05-05-2009, 02:58 PM #3
i don't think it's transmission,i've had mine changed,vibration's still there,has to be something with the motor,i checked my injectors,unplugged one at a time,so that's not it,also checked mounts as i already mentioned. anyone have any ideas?
05-05-2009, 05:54 PM #4
I had a vibration last spring. I replaced the transmission mount (summit prothane) back to a stock one (rubber) and replaced the stall. Took care of my problem.
05-05-2009, 06:44 PM #5
tell me more about the problem you had with your stall convertor,my trans mount is good,no problem there
05-06-2009, 03:35 AM #6
Once I got it back I haven't had any problems. So mine seemed to be a bad stall, and the tranny mount.
Hope this helps find your problem.
05-07-2009, 05:41 PM #7
- Join Date
- Feb 2009
- 1999 Z28
I went through this last spring and had the mechanic do the following in order to find it...I had all the tires /wheels balanced - driveshaft balanced - tranny mount inspected - new u joints - brake rotors checked out etc etc and they could find the source of the vibration and they thought perhaps it was the internals of the engine...
For a chance at narrowing it down while they still had the driveshaft out and the car was on the lift they put the car in drive and gave it some gas and found that the vibration was coming from the tranny, the tranny mount that was put in just before it was parked for the winter was not doing its job in supporting the tranny. It was a brand name unit that was used but I can not remember which one....never the less they put back in a stock tranny mount rather than the polyblabla one and the car ran without the violent shakes any longer and was as good as new. I never would have guessed that a "new" tranny mount would have been the culprit but it was....worth looking into.
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