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Old 06-14-2004, 05:29   #1 (permalink)
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Shudder when accelerating over 90km/h

Hey guys,

I have a problem with my EA. Basically, when I'm cruising on the freeway, I get a shudder when accelerating from 90-95 then it goes away and comes back from 105. It sounds/feels like it's coming from the rear left, but it could also be coming from the front left. It only happens when accelerating when you let the pedal go and let it coast the noise/shudder appears to disappear It's definitely not a wheel balance issue as this is the second set of rims I have had on the rear since the shudder became apparent.

I hope someone can help! My last thread in here didn't get any replies.

Sundeep
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Old 06-14-2004, 06:19   #2 (permalink)
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Re: Shudder when accelerating over 90km/h

it could be something as simple as getting your tailshaft checked / balanced.........you haven't bent an axle have you?
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Old 06-14-2004, 06:26   #3 (permalink)
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Re: Shudder when accelerating over 90km/h

if it's a noise as well it could be diff noise, is it the stock diff?

my custom built 3.45 open diff with 28 spline axles and ed housing in my ea makes noise under accelleration from about 80km/h-92km/h but not when coasting at these speeds, nor below or above these speeds.... vibration on the other hand could be that you've broken a tooth or something in the diff but i suspect you would have discovered this while turning....

you're running a manual IIRC too, is it only in one gear that it does it? cos it might be the gearbox also...
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Old 06-14-2004, 06:36   #4 (permalink)
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Re: Shudder when accelerating over 90km/h

I'm thinking it's the diff as well, probably a bent axle. Might even be the tail-shaft as I got a second hand unit with good uni's for my RW. I don't think it's the gear-box Silencer. I can't feel it through the shifter, and I don't think it would affect the car as much if it was from the gearbox.

My problem is almost the same as yours though Silencer, but at different speeds. Next weekend I should have a 3.23 LSD in there, so hopefully it'll be gone after that.

Can anyone suggest anything else?

Sundeep
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Old 06-14-2004, 07:01   #5 (permalink)
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Re: Shudder when accelerating over 90km/h

i'd have thought if it were the tailshaft that it wouldn't stop briefly for a bit between 95 and 105, but once started would remain solid...
so it does it in more than one gear I assume?
and is the vibration bad, or just annoying?
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Old 06-14-2004, 17:26   #6 (permalink)
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Re: Shudder when accelerating over 90km/h

rear engine/gearbox mounts... might be screwed and tailshaft might be hanging low
had it happen to my wb...
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Old 06-14-2004, 18:53   #7 (permalink)
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Re: Shudder when accelerating over 90km/h

I'll check all that out tonight guys, thanks for the replies.

Silencer: It's more annoying than anything, the car still drives and handles fine. I haven't checked if it does it in 4th yet, but I'm sure that it isn't from the gearbox. If I put it in 4th and take it to 100 the engine noise will cover the vibration/shudder.

It's always my car that has these stupid problems :o(

Sundeep
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Old 06-14-2004, 19:35   #8 (permalink)
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Re: Shudder when accelerating over 90km/h

i'd also be looking at the rear trans mount,
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Old 06-15-2004, 19:02   #9 (permalink)
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Re: Shudder when accelerating over 90km/h

hehe yeah the diff noise in mine is just an annoying thing, i just plant my foot to get clear of that speed range, or crank up the tunes (if im unlucky enough to be in a 90 zone :()
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Old 06-15-2004, 23:37   #10 (permalink)
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Re: Shudder when accelerating over 90km/h

Well I went to 5 mechanics today, 3 of them didn't have 'time' to look at my car. This is my first mechanic experience since I've had my P's and I know now why I hadn't dealt with them for so long! They have no idea, they think it's because my car's too low. They did a thorough under-body check and that's all they came up with.

I went on to my Mum's mechanic in Croydon and he's the only one that seemed to provide a reasonable explanation without even looking at the car. He said it's either the unis or a bent axle.

I'll change the diff this weekend and see whether it goes away. If it doesn't I'm getting new engine mounts (again) and trans mount, along with a fresh set of unis (also again).

Cheers guys,

Sundeep
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