Bumps around 60 to 70 mph

[yota4R]

I have a '00 4R that has these vibrating bumps every 1 to 2 seconds (not continuous vibration) as I reach 60 mph to 70 mph... if I go slower or faster, the problem seems to go away and seems only to be in that speed range.

I've searched the forum but most people are reporting problems with a full out vibration/shake while I'm just getting a series of intermittent, vibrating bumps.

Any suggestions? Replacing U-joints seem to be the most popular solution but just wanted to check in with you guys for some opinions....

Thanks :roll:

 

[Doshu]

I have a '00 4R that has these vibrating bumps every 1 to 2 seconds (not continuous vibration) as I reach 60 mph to 70 mph... if I go slower or faster, the problem seems to go away and seems only to be in that speed range.

I've searched the forum but most people are reporting problems with a full out vibration/shake while I'm just getting a series of intermittent, vibrating bumps.

Any suggestions? Replacing U-joints seem to be the most popular solution but just wanted to check in with you guys for some opinions....

Thanks :roll:

Any check engine lights?

 

[yota4R]

None :/
At first I thought it may be a tire balancing problem, since I heard that our 4Rs are lug centric vs. hub centric and are often not properly balance, but than I realized that if that was the case, the bumps would be more severe as I go faster.... but the problem only occurs as I accelerate from around 60 to 70 mph.

 

[JohnsD90]

What do you mean by bumps? Unbalanced tires will come and go at different speeds.

 

[yota4R]

Maybe bumps may not be the best description....
It is like a forward and back jerking motion.

 

[yota4R]

Do you guys think it may be spark plugs?

 

[gs300tt]

I would look at all your mounts (motor, transmission, and so on). If could also be some kind of engine miss but that would not be affected by speed.