Vibration, stanger than fiction
Thread Starter
Cruising
Joined: Oct 2010
Posts: 10
Likes: 0
From: port richey fl
Vibration, stanger than fiction
driving on the exspressway in traffic, I was alarmed with a loud vibration at 33mph it stopped just over 34 mph , Traffic opens up i accelerate at 66 mph it starts again goes away at about 67 mph. This is not a slight vibration its like being hit with a hammer, it comes on fast and goes away fast like turning on a switch, I have checked every thing i can think of even had the tires rebalanced,So i did some thing realy stupid and hit the expressway from a dead stop i accelerated and at 33 mph 66 =99 and 132 and then i checkened out. it is so loud and comes on so fast that i can not tell if it is from the engine or trans,or even the rear end. nothing seems to be out of order no codes , no miss in the motor, shifting seems to be ok no rear end noise, i am just lost as to what to look for, if i hold the speed at 33 the vibration stays, and its loud, seems like the hole car is vibrating.
I am out of ideas any help would be greatly appreciated
I am out of ideas any help would be greatly appreciated
Pro
Joined: Apr 2008
Posts: 545
Likes: 3
From: Wichita Kansas
Tires out of round?
At the various speeds can the RPM be the same as a result of the various gearing? Just a thought. If so, maybe something related to the drive shaft (imbalance)?
At the various speeds can the RPM be the same as a result of the various gearing? Just a thought. If so, maybe something related to the drive shaft (imbalance)?
Last edited by c4sailor; Nov 8, 2010 at 01:43 PM.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
Rear axle u-joint? Driveshaft u-joint? Loose C-beam? Something is setting up a resonance at multiples of 33 mph, so must be driveline related. Any odd noise? Possible internal diff. issue? You could start by checking all driveline components for loose bolts, etc.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
More than likely it is worn/loose u-joints and/or rear wheel bearings.
Put the car in park or first gear and push/shove/rock the car back and forth pretty hard by hand. Get down close to watch/listen the u-joints to see is "slop" is present. May require 2 or more people to perform this test. Don't get run over by your own car.
Put the car in park or first gear and push/shove/rock the car back and forth pretty hard by hand. Get down close to watch/listen the u-joints to see is "slop" is present. May require 2 or more people to perform this test. Don't get run over by your own car.
Thread Starter
Cruising
Joined: Oct 2010
Posts: 10
Likes: 0
From: port richey fl
3 weeks ago i had new wheel brearings and u joints put in , had a clicking , and replaced the teflon washer also, so i just had my wife and son help me push the car back and forth, i can see no slop at all and no nois or clicking of any kind, and i just drove down the street i hit 40 mph and put the car in nutral, when it hit 33 it vibreated like hell and stopped vibrsting at about 30 mph, this time i did it i turn off the key no motor running and it still vibrated, got to 40 shut off the key it started to vibrate at 33 would costing rule out engine and trans ?not being under power
Last edited by don99; Nov 8, 2010 at 02:06 PM.
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Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
Put it up on stands and start it up put in gear go 33 and either you or someone else look under the car... You probably want to put the stands under the unrights securely so you dont have some crazy angle on the half shafts though.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
In my experience, out of balance/ out of round tires typically are most noticeable at about 65mph, since yours comes in at half that, you might want to look elsewhere between the trans and the rear wheels. Not aware of a trans problem that would cause this symptom, someone may correct me on this.
Thread Starter
Cruising
Joined: Oct 2010
Posts: 10
Likes: 0
From: port richey fl
stuck in traffic started to accelerate hit 33 mph and it sounded like the hole car as going to just take off , you can feel the viberation in the steering wheel the shifter even the door handle, i know because the first time it happened i was ready to jump out, even with the engine off costing?
Thread Starter
Cruising
Joined: Oct 2010
Posts: 10
Likes: 0
From: port richey fl
just jacked up the car, removed the wheel ( drivers side ) bearing hub nut, no cotter pin and maybe 40 bls of toque, finger tight, going to torque it i think its should be 166 lbs?and give it a try, just hope my exspessway stunt has no futur consequences, driving it hard with the nut lose, funny it just started all of a sudden, and even made no noise when i pushed it back and forth in the drive way. thanks again for all the help,
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
just jacked up the car, removed the wheel ( drivers side ) bearing hub nut, no cotter pin and maybe 40 bls of toque, finger tight, going to torque it i think its should be 166 lbs?and give it a try, just hope my exspessway stunt has no futur consequences, driving it hard with the nut lose, funny it just started all of a sudden, and even made no noise when i pushed it back and forth in the drive way. thanks again for all the help,
Melting Slicks
Joined: Apr 2003
Posts: 3,110
Likes: 6
From: Red Sox Nation! RI
Whoa, that'll do it! Torque the axle nut to 185-192 ft/lbs. I'd ream out the mechanic that put it all together. Hopefully driving with a loose hub didn't damage the bearing or anything else.
Thread Starter
Cruising
Joined: Oct 2010
Posts: 10
Likes: 0
From: port richey fl
A Quick trip to GM service dept to retrieve my cap and cotter pin, and to leave behind some choice words for the shoddy workmanship, Torque at 185 lbs, both sides. and now i am worried because it has never been so quite,
I would just like to say thanks again for all the help,I am a happy driver with a quite car. thank you all.
I would just like to say thanks again for all the help,I am a happy driver with a quite car. thank you all.
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
A Quick trip to GM service dept to retrieve my cap and cotter pin, and to leave behind some choice words for the shoddy workmanship, Torque at 185 lbs, both sides. and now i am worried because it has never been so quite,
I would just like to say thanks again for all the help,I am a happy driver with a quite car. thank you all.
I would just like to say thanks again for all the help,I am a happy driver with a quite car. thank you all.
