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Vibration and popping in front end

 
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ottomatic
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PostPosted: Sat Apr 06, 2013 11:41 am    Post subject:  Vibration and popping in front end Reply with quote

I have a 2001 Impala 9c1. I have a vibration that is really prominent during moderate acceleration. There is also occasionally a popping noise in the front end when I crank the wheel, although this only seems to happen while standing still or backing out of a parking space. I have jacked up the front end and did a wiggle test on both front wheels. There is no appreciable movement top to bottom or side to side.
Any suggestions?
Thanks in advance

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Bill58
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PostPosted: Sun Apr 07, 2013 7:33 am    Post subject:   Reply with quote

Possibly a bad cv shaft.
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IffyG
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PostPosted: Sun Apr 07, 2013 3:32 pm    Post subject:   Reply with quote

Have you checked the cradle bolts and radiator braces? If any of them are loose you can get some nasty popping noises under acceleration.

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MISHNAH
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PostPosted: Wed Apr 10, 2013 12:28 am    Post subject:   Reply with quote

Tighten your cradle bolts. Many werent tightened well from the factory, and vibrations and wearing of the rubber cradle bushings makes them looser as well.

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Jnibbs24
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PostPosted: Wed Apr 10, 2013 11:25 am    Post subject:   Reply with quote

I recently had some horrific screeching and popping at low speeds and low speed turns. Was my steering rack bushings. Lube them up and see if the noise goes away.

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PostPosted: Fri Apr 19, 2013 12:22 pm    Post subject:   Reply with quote

Try backing up with the wheel turned full lock in both directions. It sounds like a CV joint that is binding/ready to fail. If the symptoms apper at full lock to the left check the passenger side axle and vice versa. Getting it up in the air and inspecting the joints usually reveals what causes that kind of failure. Worn, cracked, or damaged CV boots. I don't know about the cradle bolts but if you told a mechanic that it pops when your'e backing up and turning the axle is the first thing he's going to check.

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VIKING
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PostPosted: Fri Apr 26, 2013 12:07 am    Post subject:   Reply with quote

capitlj and Bill58 , I looked at my CV axle and the inboard boot is torn and leaking on the drivers side. I actually knew this before I posted. I had been hearing some snapping and cracking noises...thought it was my intermediate shaft. Since I posted the noise has gotten worst. I have also noticed a slight play in the wheel bearing, so that will replaced too. It says in the factory manual to replace the bolts that hold the bearing to the knuckle. I read in another form a BMW master mechanic say they have never replaced wheel bearing bolls. I don't ever remember replacing them either any ideas. .oh yeah I hope my engine mount is not what caused the tear in the cv boot, you know a bad motor mount. thanks for all your posts , any ideas post them. next weekend I plan to replace the cv axle, maybe rebuild. I have the kent moore swage tool and the boot retaining clamp tool...got them both on ebay for under $25 for both.

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TeenBeach
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PostPosted: Fri Apr 26, 2013 8:34 am    Post subject:   Reply with quote

It's good common practice to replace those bolts, they shouldn't be a big expense if I remember.

When I did my wheel bearings (which was a pita because of salty winters) I just used red loctite on the bolts. If I had the chance again I would of got new ones, for piece of mind.

Haven't heard anyone on here rebuild their cvs axel but if you know what your doing you should be fine. Also, I highly suggest replacing the wheel bearings with timken bearings.... You'll find them cheapest on amazon or rockauto.

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