Car Vibrates @ certain speed/rpm

[CB7_AUST]

Hey Guys,


Hope someone can help me diagnose my problem...

Situation: Slight uphill, @ about 2.2k-2.5k revs....@ 80-85kmh

The car vibrates, when im accelerating...but when the vibrating starts.. i let go of the throttle and then the virbrating stops... and when i step on it again the vibrating starts again...this is only @ the speeds and rpms i mentioned above...

NB: Only happens in 4th gear.... say i manually shift to 3rd gear , and im still travelling at the same speed it no longer shakes..my mech friend says due to the lack of low end power?

Help guys? My car is auto btw..

[Zer0_92EX]

could the tires, not being balance or aligned

[CB7_AUST]

Yeh, i thought about that... but that doesnt explain why it doesnt occur in 3rd gear then.. and only in 4th gear

[Zer0_92EX]

does the same thing to me(it just does it only in 3rd gear), and i know mine isnt weighted right. its fine til about 3, then it gets a lil rough then cleans out at 4th

[manny_turbo]

well when your on a uphill your suppose to be on a lower gear...hence no vibration in third...at 2k rpm's and in 4th it will vibrate just like if you were to take off in third or fifth...it means your in the wrong gear for the load...our motors have good all around power as long as your matching your rpms and speed with the road your in flat or uphill...

later

[Zer0_92EX]

yea well this happens on flat land on a highway for me.

Does it only happen going up a hill?

[Accord R33]

sounds like Axles.

[CB7_AUST]

happens on flats as well...i understand the load and right gear thing..but my car is auto...soooo yeh....just down gear early enough.. -.-

[Zer0_92EX]

yea get your tires aligned and balance, about 40-50 dollars well spent. if its not that then its you most likey what r33 said, your axles.

[eriemoto.]

how are your wheel bearings?

[zmiennik]

Im having almost the same problem but it appears at 2nd too, not only 3rd.
It stops vibrating when I go faster or slower. Just the certain speed + rpm
it appears at 40-50km/h for me.

[Losiracer2]

I had the same problem awhile back, check the balance of your tires first, if that's okay, then jack your car up a bit and tug on the axles, if you feel any slop, in the CV joints or wherever, then its most likely that. How old are the axles? chances are the CV joints internally have gotten worn out even if the boots look new/have no rips.

[ExplodingCake]

Possibilities are:

a] Rough or worn wheel bearing.
b] Damaged driveaxel
c] Tires are not balanced
d] Tires are out of round
e] Worn cv joint inner or outer

[CB7_AUST]

How do i check the wheel bearing on the car???? no sure how old everything is since i bought the car just over 1.5yrs ago.....the cv boot is actually ripped hahaha...and the drive axle you talk about, is that the same as the cv shaft?? or something different?



EDIT: according to most replies, i can safely assume that this is MOST likely not related to low end power missing correct?

[Zer0_92EX]

check your rims for any warpage to the inside, that will cause it to vibrate too