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Old 03-06-2006   #1
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insane shaking!!

guys i'll tell u a story of a problem happening in my car(fiat 127 MK3 903cc) since the last 5 months! and i really need ur help!

5 months ago the car suddenly started to shake at high speeds (100-120km/h)...i expected it was wheel balance and alignment....but i was intending to change the original wheels with new alloy ones with wider tires...so no need for balancing the original wheels now...a week after i installed the new shoes ...and the shaking was still present even after balancing all the 4 wheels and alignment of them for 2 times!!

i did every thing u could imagine to eliminate this shaking but nothing happenned:
1-changed front discs and pads
2-changed the long drive shaft, as it was bent( i thought this would be the solution)
3-checked the suspension and everything works fine.
4- for experiment i did the following:
i raised the front of the car and ran it on 120 km/h the shaking was present..
i removed the wheels and ran it again the shaking was still present but very weak..

i drove on a high way till i reached the shaky speed, disengaged the gearbox and switched the engine off...it was still present!!!

knowing that the steering wheel is shaking insanily as well during the shaking of the car..it is something related to the drive line but i dont know what it is...
sorry for talking so much and not being very well organised..
im in favor that some of u guys may have faced this problem before or could know the possible solution fo it..
thanks in advance
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Old 04-06-2006   #2
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Re: insane shaking!!

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Old 05-06-2006   #3
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Re: insane shaking!!

Since you have eliminated nearly all the usual culprits I'd say it's something suspension/steering related i.e. something loose or missing i.e. fallen off or your driving on the cats eyes just joking!

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Old 05-06-2006   #4
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Re: insane shaking!!

is the weight on the long driveshaft?
how did the D/shaft get bent?
possible damage to the gearbox/shaft mount or bent wishbone
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Old 05-06-2006   #5
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Re: insane shaking!!

How did you drive without wheels?

Maybe you buckled your wheels or they need balancing.

If you can borrow a set of four wheels you could try changing them all and see if your shaking goes away.
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Old 05-06-2006   #6
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Re: insane shaking!!

Quote Originally Posted by Trancendental
How did you drive without wheels?

Maybe you buckled your wheels or they need balancing.

If you can borrow a set of four wheels you could try changing them all and see if your shaking goes away.
it was on stands
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Old 05-06-2006   #7
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Re: insane shaking!!

Quote Originally Posted by custard boy
it was on stands
Ah, when he said raised I thought he meant suspension

Could still be the wheels though.
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Old 05-06-2006   #8
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Re: insane shaking!!

Quote Originally Posted by Trancendental

If you can borrow a set of four wheels you could try changing them all and see if your shaking goes away.
the problem is that the shaking was in my stock wheel/tyres..and now the same shaking in my new wheels and tyres!!

im thinking of the wheel bearing,..could it be?
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Old 05-06-2006   #9
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Re: insane shaking!!

could be but i would expect noise as well.
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Old 05-06-2006   #10
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Re: insane shaking!!

try rear trailing arm bushes
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Old 05-06-2006   #11
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Re: insane shaking!!

I had a similar 'insane shaking' when I had an Uno with a severely damaged tripode joint (inner driveshaft joint). It was missing all the needle rollers and two of the rings!

I suggest you pull the other driveshaft and inspect the tripode joint (runs in the differential).

-Alex
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Old 05-06-2006   #12
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Re: insane shaking!!

well, i think im going to inspect it myself ..as i just recieved the haynes manual...but im afraid i could not bring it back together ....i'll read in the manual and see the degree of its difficultiness...other wise...im going to swap the engine and gearbox for 1.3 ones..cause they done over 325000km...and never been overhauled or opened before. exept for a head gasket change and clutch ....so i think it is very enough for them...
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Old 11-06-2006   #13
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Re: insane shaking!!

Let us know what the problem was so we can suggest it to others who have similar problems
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Old 11-06-2006   #14
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Re: insane shaking!!

yea yea i'll do so...just waiting to finish my final exams ...first thing i'll do is change 2 front wheel bearnings...and let us see...
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Old 24-06-2006   #15
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Re: insane shaking!!

check tie rods, axle bearings, wheel bearings
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