Im having an issue with a bad vibration in the rear of my car, seems to occur on open road when doing over 80km/h. Have check tightned wheel nuts and bearings and these are fine. Have no idea what may cause it or why.
I have a similar problem with my car and it is linked to the rear trailing arm bushes which cause the rear tyres to warp on the inner side of the tyre wall which makes this wuring noise at certain speeds so have them checked out!
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I had the same problem with my new Defenders. Turns out I had a bad batch of tires. Not only had vibration, it caused the car to pull. I had the tires tested for roundness, and three were out of round. Additionally, two of the tires were causing what is known as radial bias pull, which made the car seem like it was out of alignment. Three alignments, four rebalances and rotations later, and with still a lot of of resistance, they replaced all four tires as defective, and the problems ALL went away. You need new tires.
not sure how similar it is but I had a supra of the same year with the same issues. It ended up being a bad connection where the chassis harness met the engine harness. I bypassed this section and the issue was resolved.
The big issue with these supras(I have one) is that the head gasket blows. Check for any white smoke from tailpipe or bubbling in the coolant overflow tank, or rough starting, those are signs i've had. I've also had trouble with my radiator/overheating, so doesn't hurt to double check that. Supraforums.com and Supramania.com are great sites too. If you ever redo the headgasket, do it right, that means quality headgasket, Felpro, or even better, metal headgasket, inspect/resurface the surfaces, and 75 to 80 lbs or torque on those headbolts.
if fuses are good and bulbs are good,it has bad grounds or the switch is failing,use voltmeter and ck for voltage at the bulb wire connections,if no voltage ck at switch end.if voltage present at switch then ck wiring between switch and bulbs.good luck
you need to isolate this better. does the vibration occur only when the car is moving or do you feel it when sitting in park and racing the engine a little.=lock into something on the engine. do you feel it in the steering wheel= front tire bad,out of balance,bent wheel.does it seem more like you feel it in the seat like the car itself is vibraitng=look at the rear tires. check that all wheel lug nutts are tight.turning corners and acellerating at the same time the vibration could be a CV axle joint. the axles could also cause a vibration.may have to be put on a lift and see if it vibrates when running of the ground. it can be hard to find .
What I would suggest is that you return the vehicle to where they installed the tires, and have them perform a 'road force balance' on all 4 tires. If your facility cannot perform this type of balancing, I would suggest that you find a tire shop that can do this type of balancing.
The road force balance procedure is the best way to ensure that no tire-related vibrations can occur.