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Old 03-14-2011, 06:57 PM   #16
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Mystery - car suspension knock after turning


CV joint(s). Plain & simple

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Old 03-14-2011, 09:07 PM   #17
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Mystery - car suspension knock after turning


Keep your eyes open for rubber bushings (sway bar, engine brace, etc) that may have shifted. I once had a knock from the back end, made sound when turning, -- turned out that a rubber bushing had shifted laterally, and the trailing arm was rubbing the steel bracket. Took a while to figure that one out. I thought it was my differential going away.
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Old 03-15-2011, 04:55 PM   #18
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Mystery - car suspension knock after turning


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Originally Posted by Bigplanz View Post
Make, model, year of car and mileage, please.

Oops! an 88 Pontiac Sunbird... Probably over 100K... first guess, sway bar bushings... Jack up car's front end, get both wheels off the ground, support the car on jack stands, start it, turn the steering wheel. If sound is gone, it's suspension wear, if it's still there, it's the steering system, maybe a binding/flexing inner tie rod. Check the boots for wear/twisted rubber.
Thnaks, Big, its got 175.000 on it!! Good tip. still maybe cab do this test this week.....please stay tuned, even though I cant jump on it today.......still too many silk worms on the oaks............Now, one thing to add from todays testing/driving: it does it after a turn, in between shifting from 1st to 2nd....while clutch is depressed. Meaning: tranny disengaged.
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Old 03-15-2011, 08:01 PM   #19
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Mystery - car suspension knock after turning


I'd check a motor mount. If the tranny isn't engaged and you clunk coming out of a turn, the motor mount might be loose or the bushing deteriorated. Check every rubber bushing, motor mount, control arm, sway bar. Also check tranny mount too. If it isn't these, a CV joint is a distinct possibility, but it should make a real distinctive sound if it's a CV joint. To test, get it on the highway, accelerate to about 50 mph real fast, then let off on the gas. A bad CV joint will then go clunk. It it's only in turns, it's probably a bushing or tie rod (my guess),
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Old 03-15-2011, 08:28 PM   #20
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Mystery - car suspension knock after turning


+1 for BigPlanz -

I'm a vote for suspension bushings especially with the high mileage. I'm betting they've not been changed?

Noquacks - if they haven't been done, do them. It will be like getting a new suspension for your well-loved old car.

When I put new ones on our '86 Volvo it handled like a new car. 200,000 miles later I need to do them again.

we've got 450,000 on it, only on it's 3rd clutch, no engine re-build - it's had synthetic in it since day 1, and it still gets 25-28 mpg. The A/C doesn't work and the interior has seen better days. But it costs me $100 bucks a year to insure, I do all the work on it, and parts at the pick-and-pull are pretty cheap.
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Old 03-15-2011, 09:15 PM   #21
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Mystery - car suspension knock after turning


if it is a CV joint, it will make one of two sounds, based on it being an inner or outer joint. If outer, it will make the distinctive "click-click-click-click" when turning but almost always only does it when powering around a corner.

An inner joint will make a thump, thud, or pop sound but only once. It won't do it on a straight run. It will do it when turning and usually only happens if you accelerate while turning. The sound comes from the plunging movement specific to an inner joint. What happens is the housing/races become worn in a particular spot. As you turn, the rollers hang up in that wear groove and when you accelerate while turning, it causes the suspension to drop which requires the shaft to elongate and when the rollers bind in the housing, you hear the noise when they pop free.

If any CV joint, the OP would appear to be experiencing an inner. To test that, simply drive the car in circles. Start slowly and then accelerate to cause the car to lean. Do not alter your steering angle (that will help prevent other factors coming into play). You can so this continually until you are satisfied you hear something, or not. Then circle the opposite direction and do the same thing to check the inner cv joint on the other side.


quacks: did you put a new or used rack in? Either new or used; did you use new mounting bushings?

If a used rack, I would look to a bad bushing that holds the rack in place. You should be able to grab the inner tie rod and shake it perpendicular to the rack/rod line. If the bushings are bad, you should get noticeable movement. You will also likely have power steering fluid leakage at the seal. Look inside the boot that spans from the rack to the tie rod.

I have also seen bad racks that had too much slop in the rack and pinion interface and cause a looseness but until that looseness is noticeable with a hands on inspection, the weight of a car being able to impart much more force, may cause a knock similar to a bad inner tie rod socket.

If the bushings are bad, they may act in a similar way. Not enough slop to move by hand but the force of the car is much more powerful.



With the miles on the car, I would also look at control arm bushings. They are often overlooked because they seem to last forever.
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Old 03-16-2011, 04:39 PM   #22
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Mystery - car suspension knock after turning


Thanks again, guys. What great support/concern Ive found here!! Some answers to your questions:
1) Yes, new rack with new rubber mounts. Pretty tight. But steering is still kinda sloppy (pointing to cv joint play??)
2) Motor mount (front) and trans mount new 2 yrs ago
3) Original control arm bushings- appear solid/one piece/no rot. Wedged a crow bar in them and no play


I am focusing more now on the CV joint, especially the driv side which has a boot that has been for years a split boot. I redress it with grease say, every 2 years. Last time appeared to be not dried out. But who knows.Heres what Ive found for a cv joint test:

SYMPTOMS OF CV JOINT FAILURE
Bad boots are not the only thing you need to look for. You also need to listen for noise or complaints that might indicate a CV joint problem. These include:

Popping or clicking noises when turning. This almost always indicates a worn or damaged outer CV joint. To verify this condition, place the vehicle in reverse, crank the steering wheel to one side and drive the vehicle backwards in a circle (check the rearview mirror first!). If the noise gets louder, it confirms the diagnosis and the need for a new CV joint or replacement shaft assembly.

Ive always ben aware of this test, and actually, did it about a month ago. BUT, Im still suspicious of it. So, right now, silkworms or more silkworms hanging all over my driveway/property, working their way down my shirt collar, Im gonna jack up the sunbird......

Oh, I thought the classic sound of a bad cv joint was a click-click-click driving it in REVERSE kinda fastly, but Im getting just one POP. Could be inner?

Leah, amazing mileage on that Volvo! Im jealous........a sunbird is not a Volvo......


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Old 03-16-2011, 05:17 PM   #23
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Mystery - car suspension knock after turning


Ok, did it. Well, only thing is I cant turn fast in a circle well in my driveway, but managed to do partial....and yes, I hear a pop when turning, but no click click click. Kinda spliting hairs, I figure. Now, tomorrow, Im taking it to work and I have the whole parking lot, and thats where a GOOD test will be able to be done. Im gonna do both rear turn right, and left. I'll let yous know. I cant draw conclusion with my driveway test....not good enough.

Whattya think so far? I tyink Im on the right track (pun?)
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Old 03-16-2011, 06:00 PM   #24
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Mystery - car suspension knock after turning


When you're in the parking lot - get under your car with a flashlight and look at all your bushings.
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Old 03-16-2011, 10:00 PM   #25
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Mystery - car suspension knock after turning


when testing for the inner joints, go in a circle...slowly. Maintain that same turn and accelerate a bit until you get the car to roll a bit. It is then when you should hear an inner joint if it is the inner joint making the noise. Do it in both directions. When turning left, you are checking the left joint. When turning right, the right joint.
you need to do this in a big empty parking lot where you have a lot of room.
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Old 03-18-2011, 02:47 PM   #26
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Mystery - car suspension knock after turning


OK, did more tests.....went in circles backwards at work......boss said it was strange.

Didnt get any noises when just turning in reverse. BUT, when going forward got the POP. POP was only when turning right, then straightening out, between 1st and 2nd....in "neutral". No pop when turning left then going straight.

So, whats the verdict? Im kinda confused. I can say for sure, thet when I get the pop, it is right under my left foot, near clutch pedal. No way its at the far right......
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Old 03-18-2011, 02:56 PM   #27
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Mystery - car suspension knock after turning


1. like i said, engine mount; i don't think you did ALL of them. right? engine normally has 3 and trannie has at least 2, and where your foot feels it, it's one of them close by.
2. you had rack n pinion replaced, right? it is loose on one of it's mounts/bolts
3. if you feel it under your left foot, in the body, then it's somewhere close. depending on your steering configuration, it might be link between steering column and rack n pinion. those are usually very hard to get to, and shops do sloppy jobs on re-fastening everything back.
4. you do have a cardan joint between steering column and pinion? see where i'm headed to? that should be right next to your foot.
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Old 03-18-2011, 04:37 PM   #28
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Mystery - car suspension knock after turning


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Originally Posted by ukrkoz View Post
1. like i said, engine mount; i don't think you did ALL of them. right? engine normally has 3 and trannie has at least 2, and where your foot feels it, it's one of them close by.
2. you had rack n pinion replaced, right? it is loose on one of it's mounts/bolts
3. if you feel it under your left foot, in the body, then it's somewhere close. depending on your steering configuration, it might be link between steering column and rack n pinion. those are usually very hard to get to, and shops do sloppy jobs on re-fastening everything back.
4. you do have a cardan joint between steering column and pinion? see where i'm headed to? that should be right next to your foot.
OK, one more look at it.....what the heck. I'll shake the engine maybe, with a 6' 2x4. But, like I said in post #22, rack is TIGHT. I checked it. And yes, I did put in new bushings. Now, UK, I did the rack myself. Yes, that cardan(?) joint is a pain to get to, but Im not gonna take it apart now.....LOL

I doubt its the rack. So, I gotta say, UK, you have a good point on the idea of the noise being cl;ose to the floor/left foot. If it was the cv joint on driv side, would one feel that that way??

Time to head back outside.......
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Old 03-18-2011, 04:43 PM   #29
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Mystery - car suspension knock after turning


OK, firdt, before going back outside and crawl under car, heres the onnly mount I did not replace:
http://www.rockauto.com/catalog/moreinfo.php?pk=315098

Its the right-rear mount. Kinda a pain to get to........

be back.........
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Old 03-18-2011, 05:17 PM   #30
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Mystery - car suspension knock after turning


Whew......what a pain. Cant even get a good view down there. Kinda felt around with my fingers and go from a "mental" picture. Im thinking UK has a point: replace that final mount that has not been replaced, and go from there. Its cheap, and probably not a big deal to yank. Easier than a cv joint.

THEN, at least you have that covered. Right?

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