Having a weird vibration issue. Any ideas?
11-08-12, 07:17 PM
#1
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Having a weird vibration issue. Any ideas?
So I bought a 92 LS400. Everything seems great except it's having a strange issue.
The car has a vibration/shaking. almost the same feeling of having warped rotors, when it's bad it feels like there is a flat spot on one of the front wheels. Only happens under these conditions:
-Decelerating or at light throttle/cruising. NOT when accelerating
-Only when the car is warm (starts to happen around 10 minutes after driving it)
-Happens very randomly. Sometimes badly, sometimes not so badly.
-Only happens when driving over 60 km/h (around 45 mph)
There's no shaking or play in the steering wheel. It just feels like the front end of the car is shaking.
At first I thought it just needed a wheel balance, so I went and got all 4 wheels balanced. Didn't solve the issue. The car also has the TRAC off light on all the time. I read that it means there's a DTC present. I ran it for codes and got a code 28. So I am going to be replacing the O2 sensors tonight. I have a feeling that won't change anything though, besides my fuel mileage. I also checked for tie rod play and there is nothing.
Anyone have any ideas? I'm pretty stumped.
The car has a vibration/shaking. almost the same feeling of having warped rotors, when it's bad it feels like there is a flat spot on one of the front wheels. Only happens under these conditions:
-Decelerating or at light throttle/cruising. NOT when accelerating
-Only when the car is warm (starts to happen around 10 minutes after driving it)
-Happens very randomly. Sometimes badly, sometimes not so badly.
-Only happens when driving over 60 km/h (around 45 mph)
There's no shaking or play in the steering wheel. It just feels like the front end of the car is shaking.
At first I thought it just needed a wheel balance, so I went and got all 4 wheels balanced. Didn't solve the issue. The car also has the TRAC off light on all the time. I read that it means there's a DTC present. I ran it for codes and got a code 28. So I am going to be replacing the O2 sensors tonight. I have a feeling that won't change anything though, besides my fuel mileage. I also checked for tie rod play and there is nothing.
Anyone have any ideas? I'm pretty stumped.
Last edited by RA40; 11-09-12 at 10:59 AM. Reason: descriptive title
11-09-12, 08:52 AM
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Sorry, I forgot to mention...
I highly doubt it's an engine issue. When the problem starts to happen, putting the car in neutral doesn't change a thing. And the engine runs fine when idling/accelerating.
I highly doubt it's an engine issue. When the problem starts to happen, putting the car in neutral doesn't change a thing. And the engine runs fine when idling/accelerating.
11-09-12, 11:05 AM
#6
With a 92, you'll have the potential for a multitude of bushing issues. The first one would be the strut rod bushing. Following those are UCA and LCA bushings, engine and tranny mounts. Rotate the wheels around and see if there is any change in vibration. LS's can be very sensitive to wheel balance issues, the slightest bit off is amplified when combined with worn bushings. 60km/h 45MPH is the typical speed this shows up.
11-09-12, 11:55 AM
#7
my engine mounts and trans mount need to be replace. I have a vibration above Xxxxrpm... I suggest strutrod bushings because u said felt during deceleration. But as RA40 said it could be any bushing.
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11-11-12, 12:13 AM
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Also the car pulls to the right when braking. The vibration seems to go away at highway speeds and when driving in heavy traffic.
On that diagram, which is the strut rod? (48660, 48670?) and the bushing? (48574?)
On that diagram, which is the strut rod? (48660, 48670?) and the bushing? (48574?)
