Technical Wobbly steering wheel at high speeds

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Technical Wobbly steering wheel at high speeds

cmosfxx

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Alright guys... Let me first list the known problems the car has right now.

(the car is LHD)

1) Spring noise when steering at low speeds from the left somewhere - although the actual spring is not vibrating. I guess it's a classic top mount problem. Some days I hear it, some days it's fine. :bang:

2) Right drop link got stuck a year ago for unknown reasons and the small boot teared apart completely.

3) I think the stabilizer bar needs new bushings. Loud noises (non-metallic) when it's hot over potholes. (No noise over bumps etc)

4) Engine mounts are soft. Engine is shaking a lot at low speeds/gears.

5) Rear shocks have 25% difference in performance (L/R)


Now, the steering wheel is wobbly (shaking left and right) at high speeds ~70 to 100mph and ONLY on acceleration.
Less than ~70mph or more than 100mph and it's fine.
Also no shaking on WOT low speeds.

If I let the gas out it's stable again, no shaking etc.

I've replaced tyres (brand new dunlops), balanced wheels, switched wheels front to back etc... No difference. :bang:

Any ideas on what to look at next or what it may be? Mounts, CV joints, suspensions (a lot of miles on them)
 
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Sounds like CV joints, Normally the inner. I see you found this post
https://www.fiatforum.com/grande-punto/454969-shaking-vibration-front-wheels-60-80-km-h-2.html
Seems to affect the tripod / tulip syle inboard joints.
The Croma suffers from this and got a lot of bad press as a result, but we have a easy cure and upgrade which is to fit Vectra C drive shafts. These have ball type joints at both ends and effect a complete cure. As a bonus second hand Vectra shafts are cheap.
Unfortunatly this is not an option for the Punto.

Robert G8RPI.
 
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Sounds like CV joints, Normally the inner. I see you found this post
https://www.fiatforum.com/grande-punto/454969-shaking-vibration-front-wheels-60-80-km-h-2.html
Seems to affect the tripod / tulip syle inboard joints.
The Croma suffers from this and got a lot of bad press as a result, but we have a easy cure and upgrade which is to fit Vectra C drive shafts. These have ball type joints at both ends and effect a complete cure. As a bonus second hand Vectra shafts are cheap.
Unfortunatly this is not an option for the Punto.

Robert G8RPI.

Should I replace both of them or just the right one?
 
I'd check for radial play (up-down-front-back) before taking the decision ...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 
I'd check for radial play (up-down-front-back) before taking the decision ...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

Axle is solid, no play at any direction... I haven't tried to play with the cup. I'll check it soon.
 
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Just an update, I've found a stripped wheel bolt. Hub is damaged.

Perfect.
 
Bad news, was the Wheel kinda loose or still stiff on the 3 other bolts ?

If you want to restore your hub, Google for M12 x 1.5 helicoil, that's what you need ...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 
Bad news, was the Wheel kinda loose or still stiff on the 3 other bolts ?

If you want to restore your hub, Google for M12 x 1.5 helicoil, that's what you need ...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

I think somebody installed 12x1.25 bolt on my last service. Anyway....:bang:

I know about the helicoil / timesert solution but I'm going to replace the bearing and the hub.
 
The four of them !? Must have been pretty obvious something was wrong no ?
Anyway, I wouldn't rely on a 4 helicoiled hub neither; safety first ...

BRs, Bernie
 
The four of them !? Must have been pretty obvious something was wrong no ?
Anyway, I wouldn't rely on a 4 helicoiled hub neither; safety first ...

BRs, Bernie

Oh no only one bolt was wrong. I don't trust helicoils on hubs tbh :eek:
 

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Quick update

I've replaced all discs, fixed the hub and the anti roll bar bushings. No difference.

THEN I re-balanced the wheels and the steering wheel is now stable at high speed accelerations.
 
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Multi-reasons issue; the hardest to solve but you did it... Congrats !!

BRs, Bernie

BTW, thanks for the sharing !
 
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