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Odd shaking at 50 - 80 and sometimes not there . .


New-to-240z

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So, I replaced all the front end bushings with poly bushings. I also replaced tie rods, steering coupler with poly, and sway bar. I had the tires balanced and alignment fixed. ( camber is off because of HP struts and Eibach springs. )

Here's the problem. When I'm driving around town at 0-45 mph I get no wiggle in the steering wheel. BUT, as soon as I hit 50 or so I get a pretty violent wiggle and its pretty noticeable. If I try to hold tight to the steering wheel to stop it, as hard as i try it won't. Now, HERE'S THE REALLY WEIRD PART!!! At night almost never happens? What the hell is up with that?

And this shake doesn't always happen at the same speeds. Sometimes it won't shake till I hit 70 and sometimes it will be shaking and then all of a sudden disappear and then come back again. What do you think the problem could be? I'm totally lost! Someone please help me out here!

-Matt

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Something is LOOSE:tapemouth

Assuming your new steering gear is all tight and wheels are aligned, methinks you may have some sort of driveline balance or looseness problem.

Either get it up on jackstands or better yet a hoist, and check every item for looseness and or damage.

Diff mounts, tailshaft bolts, gearbox mounts etc.

Check your front rotors, hubs, callipers as well.

Check everything:nervous::nervous:

Night time, well, there are few gamma rays around at night so that would explain thatLOL

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I'm with geezer. I had a very similar situation recently with my 72 with poly's and new ball joints. The tires/wheels were balanced twice and the fella that did the work said that they balanced out fine with no problem, but I still had issues. When I put on my "new to me" wheels and tires the problem completely disappeared. Much more enjoyable to drive. So my best guess is that radial seperation is your issue. Good luck.

Nate

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You guys probably have it solved, but I have to mention I was using original wheels and wheel covers first when I got the 77 - balanced wheels, all new front end gear, wheel alignment - went for a drive - same as you described.

Took a while to see it, but tried without wheel covers - perfect. Ended up buying wheels.

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What really tips the scales towards belt separation (for me) is the comment about it not occurring at night. That seems to indicate a temperature variance, which has a dramatic effect on tires. Everything else would be a constant.

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What really tips the scales towards belt separation (for me) is the comment about it not occurring at night. That seems to indicate a temperature variance, which has a dramatic effect on tires. Everything else would be a constant.

+1

that could be the exact reply from my side when I first read the post.

if you have a friend who has a good set of four wheels, barrow them from him, drive the car and compare.

good luck.

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I will be switching out the tires tomorrow front to back back to front. Hopefully that will fix the problem. I've already checked everything, and the rotors are perfectly fine. I replaced the rotors and pads at the same time and did a break in session and let them sit after finishing. So, I'm thinking its really the tires like you guys said. I'll be checking that one out tomorrow. Thanx for all the quick replys

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just to chime in on this... wheel balance!!! Z's are notorious for feeling a wheel that is slightly out of balance. my wheel balance has to be spot on to not feel it.... even if a shop tells you they are balanced, ask them when's the last time they callabrated the machine.

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My white Z had a similar shake to it although it would still do it at night. Through the course of owning the car I went through 2 sets of wheels, 4 sets of tires, 3 sets of struts, new tie rod ends, new ball joints, strut rod bushings, control arm bushings, steering rack bushings, steering coupler bushing, 2 steering racks (1 reman and 1 new), 2 sets of outer tie rod ends, a couple alignments, swapped out the hubs and rotors on my other car that didn't have a shake to it. Everything I did would only tend to move around at what speed the shake came and went. Switching back to softer bushings made the problem less noticable in the steering wheel but that is just because less of the shake was getting transferred there.

The best it ever got was when a tire shop did an on the car wheel ballance. He could ballance the wheel on the machine and then spin the drivers side wheel up to speed and it would start vibrating the front end, no sign of any cause that they could find.

Last weekend I wanted to swap out the struts and brakes with my other (new) Z so I just traded the entire assembly between the cars and now my orange Z has the shake. When I traded them I also replaced the ball joints and control arm bushings. I guess this weekend I get to switch back....

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I will be switching out the tires tomorrow front to back back to front. Hopefully that will fix the problem....

Actually, that won't FIX the problem, it will just swap it out to the rear end of the car.

That may also have it's repercussions but at least it will get it away from the front end of the car where steering is critical.

However, and do take note of this, if all four tires were bought/installed at the same time, there is a very good possibility that the problem will resurface when the rear tires (now front) undergo the same stress that the original front tires endured.

Simply put, you may drive a mile, or a thousand before it happens again. So, you definitely want to have the tires checked at a tire shop with the knowledge and expectation to buy at least TWO if not all FOUR tires in the near future.

2¢

E

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  • 2 weeks later...

I had a vibration problem in my '71, turned out to be an out-of-round drum. It took me new tires, two tires balancings, a changed stub axle, all new bushings around the car until I had the thing on stands and my girl friend was like, "hey maybe that round thing is not really round." Yeah turned out to be a $15 fix after my girlfriend figured it out for me:stupid:

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