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Old 17-08-2011, 09:47 AM   #1
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Car wobble HELP PLEASE!

Guys, need some advice badly.

After visiting three so called ‘expert Skyline garages’ including an approved Nissan specialist, my R33 V-spec is still handling like a dog.

If I drive over the slightest bump in the road, the steering becomes very random for a split second and feels completely uncontrollable. Additionally, the steering becomes very light and ‘woolly’ and during the effect the steering wheel very slightly judders. This effect is worse on ‘bendy roads’, particularly if there are sharp(ish) right hand bends.

I have had numerous tyre changes and various racking bits changed and readjusted, but I believe this issue started when the first so called expert, took off the steering wheel, messing up the float switch sensor alignment, when the initial problem was most likely somewhere else.

Now the problem is seriously ‘getting to me’ and today after the THIRD recent wheel alignment, driving into work, I heard what seems to be the rear drivers side brake pad catching on the disc but more importantly virtually sod all handling improvement after the latest garage said that the car was behaving perfectly!!!

Therefore, can anyone shed any light on possible causes / fixes (HICAS etc.), and most importantly direct me to somewhere on this planet, that has the capabilities to sort this out without me needing a second mortgage, so that I can get my car back!!!

Thanks for your help,

A desperate Skyline owner.
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Old 17-08-2011, 09:51 AM   #2
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I'm no expert but I would try and disable the HICAS to see if that is getting confused. I'd disconnect the plug on the HICAS rack and then take it very carefully when you do a test drive.
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Old 17-08-2011, 10:27 AM   #3
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Thanks. Thats a good idea, as that would completely eliminate the HICAS from the equation....also could be an interesting drive! I'll see if I can work out how to do this, but in the meantime any further help would be great.
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Old 17-08-2011, 10:47 AM   #4
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Disconnect the hicas take it for a short run. Don't boost too much as hicas will not be active. Your power steering will be heavy. See what happens then. Also what discs are you running on the front. I had a anoying wheel wobble and change tyres balanced wheels ect with the problem still they. All my bushes where good to. Found out the my discs be warped causing wheel wobble which was ever so slight under acceleration and mild under braking. New discs were fitted and everything is good now.
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Old 17-08-2011, 10:50 AM   #5
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Have you had a look through my HICAS thread? How is your speedo converted? Do you have any play in any bushes or anything?

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Last edited by StuartTheFish; 17-08-2011 at 10:58 AM.
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Old 17-08-2011, 02:10 PM   #6
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Thanks Guys, will attempt these things tonight!!
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Old 18-08-2011, 09:37 AM   #7
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How did you get on?

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Old 19-08-2011, 09:15 AM   #8
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Well.....took off HICAS as suggested and found that the drivers front side close to the wheel area seems to be the area of most (if not all) of the wobble. The steering though is certainly not heavy but very light, with the steering wheel having quite a bit of judder.

Went to see the technician (a so called specialist) who is looking (not for too much longer) my car, and the issue of HICAS was discussed. He stated that the HICAS only worked up to 40 mph, and was not the problem. I explained to him what was done, and he kept on going on about wheel balancing, and even had the cheek to tell me my car was driving great....it certainly isn't!!!

Had a quick look to see if there were any other issues around the area, and found that I most likely need brake discs, as they are quite worn, and very evidently worse (if not warped) at the front of my car. When I put the HICAS 'back on', as per StauartTheFish's excellent thread, I then took the car for a drive, and now the wobble is even worse especially when I brake hard, and / or go into a corner fast.

So, it looks like I’m looking for yet another garage, so please please could someone direct me to someone suitable preferably in the Cambridgeshire / Suffolk / Norfolk area who really knows what they are doing, as this is way beyond my skill set.

Additionally, if anyone can think of anything to narrow the issue down, then please reply.

Thanks for looking.
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Old 19-08-2011, 02:18 PM   #9
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HICAS does not only work up to 40mph, so I suggest you try another "specialist" who actually knows what they're on about. If you've read my thread, have you checked for error codes, and run diagnostic mode to see if it's working as it should? Sounds more like a physical issue rather than an electrical one though. That said, the power steering definitely should not be light if you had disabled HICAS temporarily, as HICAS controls power steering too and you'd end up with no assistance whatsoever. How did you disable it?

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Old 19-08-2011, 06:11 PM   #10
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Quote:
Originally Posted by skyping View Post
Went to see the technician (a so called specialist) who is looking (not for too much longer) my car, and the issue of HICAS was discussed. He stated that the HICAS only worked up to 40 mph, and was not the problem.
I'm sure someone can correct me but I was led to believe that HICAS was only active over 50mph??
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Old 19-08-2011, 06:13 PM   #11
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It sounds similar to having too much negative caster therefore giving a trolley effect on the wheels but then if you had that issue i would of thought it would be like that all the time not just bumps in the road but worth checking out
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Old 19-08-2011, 06:26 PM   #12
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APT have a great reputation and are in Norwich
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Old 19-08-2011, 07:29 PM   #13
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Quote:
Originally Posted by Phil69 View Post
I'm sure someone can correct me but I was led to believe that HICAS was only active over 50mph??
from what I've read that is right, but faults will sometimes make it do strange things

I've had a broke steering sensor cause the back-end to jump about under hard acceleration
and the tone that's played when you phone a unrecognised number through the car kit make the back-end kick out
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Old 21-08-2011, 09:23 PM   #14
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Thanks for all the comments chaps. Just got back from an eventful journey to my girlfriends, and once again car's very twitchy especially from around the drivers front side.

Clearly, after reading all your feedback, the issue simply cannot be the HICAS, as the problem can be at 10 or 70 mph, it does however tend to be associated with the road surface, especially the more bumpy roads. The car is as smooth as silk IF travelling along a dead straight piece of motorway or town road. Now that I've had a bit more experience with the problem, its most likely a mechanical issue, and something that I must sort out ASAP.

I've had quite a few bad experiences with so called specialists, and so will try APT next week, or indeed any other suggestions that you guys can direct me to. I am currently working in Thetford, Norfolk, so if anyone can suggest anywhere close by that would be great.

Thanks for all the help, and I'll update once I've booked the olde girl in and got whatever needs to done completed.
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Old 21-08-2011, 09:55 PM   #15
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I just have a feeling its a bush thats fooked.
I remember my brothers car( not a skyline) used to go apeshit when he went over a bump.It was the wishbones.
Knackered bushes can really effect the handling of a car and if its not the hicas and you feel the effect in the front then it must be suspension or steering...and youve had it all aligned.
Something must be worn or loose .
Good luck.As said APT have a good reputation
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