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YOUR RESEARCHKnocking sound from the front but only after the car is hot
Leading reported evidence
Replace of the front arms and bushes
Performed · outcome unconfirmed
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0
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1
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Performed · outcome unconfirmed · Original poster
All of the front arms and bushes were replaced a couple of years ago but the springs, shocks and top mounts are original.
Knocking sound from the front but only after the car is hot
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Leading evidence: 'Replace of the front arms and bushes' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace before' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
It's had those bits replaced before but perhaps cheap aftermarket bits were used and they've not lasted long.
Knocking sound from the front but only after the car is hot
Test route
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Suggestion
Chris at Centre Gravity has a cobbled street on his test route to specifically identify the problem.
Knocking sound from the front but only after the car is hot
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6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Hi all
I've got a 98 C2 with just under 70k miles. All of the front arms and bushes were replaced a couple of years ago but the springs, shocks and top mounts are original.
The car drives fine, but has developed a knocking sound when going over even the slightest bumps. It can also be felt through the steering wheel, almost as though something has become a bit loose. Weirdly it only happens when I have been driving the car for 40+ minutes and gets worse the hotter the car is.
I took the car to Northway Porsche and they couldn't find anything wrong with the suspension at all (I initially thought it might be top mounts). I'm not sure if it will be harder for a garage to diagnose unless the car is being worked on while it's still hot.
Has anyone had a similar experience or know what might cause the issue? I have noticed it started happening after I had new refurbished wheels fitted and took the car for a wheel alignment but I'm not sure if it would be related to that at all.
Thanks
Yes, it's the inner track rod end. As they warm up with friction of movement, they expand and seize a little causing the noise and that's why you feel it in the steering.
I had a similar sounding problem... turned out to be the N/S front 'tuning fork' arm, diagnosed by Chris at Center Gravity who recognised the noise during a road test.
Interestingly it felt fine, no play on inspection but plainly the ball joint was making a noise when warm, and the new one felt much more smooth.
Dead easy to fit and not expensive.
Just thought worth flagging in case these weren't changed in the work you've had done.
Thanks for the replies. It's had those bits replaced before but perhaps cheap aftermarket bits were used and they've not lasted long. It's just a shame the garage didn't actually diagnose the issue which I'd asked them to look at!
Time to take it to another garage then by the sound of it.
Manufacturing defects are not unknown in any component.
Good timing as I have a similar noise only noticeable (sound and feel through the steering wheel) at slow speed on bumpy surfaces. Chris at Centre Gravity has a cobbled street on his test route to specifically identify the problem.
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