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Z31 300ZX(T) 1984-1989 Zs - Engine and Chassis Discussion


       
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Old Jun 10th, 2005, 07:42 PM   #1 (permalink)
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Speed Triggered Vibration? WTF!?!?!

Okay, I got my tires balanced hoping that it'd fix a vibration I have. Nope. SO it's not the tires. It's a vibration that starts, literally, at 45mph. It wont go away till the car drops below 45. Any Ideas? It first starts in the Steering wheel than it'll shake through the entire car. Axles? Steering? Suspension? Bueller? Bueller?
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Old Jun 10th, 2005, 07:58 PM   #2 (permalink)
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You have several things to look at, at this point. Driveshaft, rear 1/2 shafts, wheel bearings. It's also possible one of the brake hubs on the car is warped or not seated properly. This will cause a lot of "run-out" when the wheel is bolted to it.
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Old Jun 10th, 2005, 08:08 PM   #3 (permalink)
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So should I just take it somewhere and say find and fix the problem?
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Old Jun 11th, 2005, 08:19 AM   #4 (permalink)
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Garages will probably charge an arm and a leg for such an ambiguous assignment. "Find this problem" and they will find 100 other things to go with it. Are you mechanically inclined in the slightest? You should try to trace this problem yourself.
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Old Jun 11th, 2005, 12:43 PM   #5 (permalink)
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that's what I'm afraid of. Could it have anything to do with the power steering? (power steering pressure hose is cracked) My dad says he think it's either the Half-shafts, CV Joints, or possibly the PS, but It vibrates even going straight on flat, even surfaces.
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Old Jun 11th, 2005, 06:20 PM   #6 (permalink)
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I don't think it's the PS.
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Old Jun 13th, 2005, 07:50 AM   #7 (permalink)
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You could spend the rest of your life looking for the vibration.Spend the money, take it to a garage.Hope it's something cheap.You want to drive, not worry about it.Jamie
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Old Jun 14th, 2005, 01:50 AM   #8 (permalink)
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I'm thinking about taking the car to nissan and having them inspect the car, and get quotes for all the work that needs to be done. I'd rather give them the car to pick apart then "Big Lou." Do you know if the dealership will do that? just pick it abart looking for what's wrong?
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Old Jun 14th, 2005, 05:49 PM   #9 (permalink)
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Quote:
Originally Posted by Z_Spool
I'm thinking about taking the car to nissan and having them inspect the car, and get quotes for all the work that needs to be done. I'd rather give them the car to pick apart then "Big Lou." Do you know if the dealership will do that? just pick it abart looking for what's wrong?
Yea man, they'll do anything you want.. for the right price.
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Old Jun 14th, 2005, 06:49 PM   #10 (permalink)
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For an arm or a leg or your first born, usually. Seriously, this sort of thing is not hard to do yourself. Get the back end up off the ground, go around under there and shake all the moving parts. Driveshaft, 1/2 shafts, suspension..... Takes about 5 minutes and it's free. Move them around in all directions. Make sure you use blocks, rocks, spare tires, whatever else you have to make sure the car won't fall on you while you're underneath. And then go buy yourself beer for a month off what the dealer would have charged you, because you found the problem yourself.
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Old Jun 20th, 2005, 03:54 AM   #11 (permalink)
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well... Here's a new development... I was running late tonight so I said "screw it, I can hold it kinda straight while it's shaking, and if it gets too bad I'll back off. but otherwise I'll just have a wicked-bad arm-pump when I get home." So I was rushing home flying up the freeway on-ramp when I realized the vibration had gone away. I looked down at the speedo and I was doing about 70-ish. Whaaaa? Yeah... It turans out it starts at 45 MPH, gets the worse at about 50-55 MPH, then fade away at 65 MPH. So if I'm below 45 MPH or above 67 MPH it's all gravy. Go figure. Just thought I'd share this for furter analysis/speculation. So good night. Got to be up at 7 and it's 2 now... and tomorrow's another 9 hour day... at least. When does summer end? *sigh*
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Old Jun 20th, 2005, 07:43 AM   #12 (permalink)
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Sounds like driveshaft to me. Same thing happened on my '71 Chrysler many yeasr ago, turned out all the U-bolts holding the driveshaft to the diff yoke were loose, and the nut was missing on one. I know the Zs diffs are set up differently, but it wouldn't hurt to look...... Look at the back of the transmission also, where the driveshaft comes out.
Last resort, you might want to get someone to follow you, or someone to drive your car while you follow behind, and try to see if the any of the wheels wobble or anything unusual.
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Old Feb 3rd, 2008, 10:59 AM   #13 (permalink)
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zpool,
did u ever find out what the problem was. must be a driveshaft problem. it happened to me after Pee Boys installed a new center bearing. what a headache. i took it back to them week after week for mos.. they finally sent me to ammco, they fix it in 30 mins., it was driveshaft timing. it seems only a few people know how to fix it.

i have a HB x cab, 2 section driveshaft, 4x4, i could feel the vibartion "in the seat of my pants" as they say.

Last edited by azmike : Feb 3rd, 2008 at 11:07 AM.
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Old Feb 3rd, 2008, 03:17 PM   #14 (permalink)
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why would you bring back a 2 and a half year old thread?
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Old Feb 3rd, 2008, 03:42 PM   #15 (permalink)
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Originally Posted by nickz3188 View Post
why would you bring back a 2 and a half year old thread?
I'm new to this net stuff maybe I shouldn't ask about something 2 1/2 yrs old.

I wanted to know if the problem had been solved and what they did to solve it. It seems to me out of respect for others there might have been a solution presented to the thread, but as I have said I'm new at this.

The question now, after your responce, is why u would care. Also why would u write out "2 and a half year..." rather than simply write 2 1/2 yrs. Oh, I'm not really asking u a question.

Last edited by azmike : Feb 3rd, 2008 at 03:49 PM.
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