XJ XJ8 / XJR ( X308 ) 1997 - 2003

Knock on front suspension

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Old Jul 23, 2025 | 08:45 AM
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Default Knock on front suspension

After many parts change, my lovely car is always making noise in front end... Somebody experienced that situation ??? Thanks for your advices !!!!
 
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Old Jul 23, 2025 | 09:38 AM
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We might be able to offer better suggestions if we knew approximately
where the "knock" is coming from and when you experience it.
 

Last edited by RandyS; Jul 23, 2025 at 11:04 AM.
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Old Jul 23, 2025 | 10:27 AM
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Yeah, we need more info as far as parts replacement. Under what circumstances does this noise occur.
 
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Old Jul 23, 2025 | 11:57 AM
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As the others have said, more info is needed about the circumstances when you hear the sound. But I'll go out on a limb and say that it's your upper shock mounts (one or both of them). The rubber bushings might appear to be ok, but they wear out very quickly if the upper plate was tightened too much, and the damage is not always visible. When that happens, there can be a frequent clunk, click sound even if you don't think you're hitting a bump. I've replaced mine a few times until I got wise enough not to tighten the top nut very tight.
 

Last edited by aquifer; Jul 23, 2025 at 12:09 PM.
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Old Jul 24, 2025 | 03:26 AM
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Engine mounts to check.
A brake check rev of the engine with the bonnet up, looking at the engine movement will show one side rise if failed. Underside there will be oil stains on the subframe below the mounts.
 
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Old Jul 24, 2025 | 07:18 AM
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I will look for....
 
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Old Jul 24, 2025 | 07:21 AM
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Noise appear on light bump at low speed
 
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Old Jul 24, 2025 | 08:44 AM
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If we knew the "many parts changed" already, we might be able to
narrow down, what's left that can make a noise over a "light bump"
Without more knowledge of what's been done, we are shooting in
the dark.
 
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Old Jul 26, 2025 | 09:01 AM
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If it's a clunking noise, I'd suspect the upper shock mounts. I changed these many years ago on my first 2000 VDP with those black rubber bushing mounts. After that there was still clunking so I changed everything rubber mounted suspension related and still the clunking. Finally changed the upper mounts with those ones with the yellow bushings. Best, D
 
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Old Jul 26, 2025 | 12:36 PM
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On three of these, my experience is it is always the upper shock mount: both sides on first 308; left side on second (replaced first time with hard neoprene insert -- look for BFH method -- knocked badly when cold; then with Mehle unit, then right side with Uro); third, both sides with Uro, now right side knocks when really. cold <0*C/32*F, replacements from Rock Auto in hand). See #9.

Front sway bar bushings also candidates.

Then motor mounts, see Sean's #5.
 

Last edited by Jhartz; Jul 26, 2025 at 12:38 PM.
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Old Jul 27, 2025 | 08:45 AM
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Ok, Many thanks, guys, for your posts...I will go with these advices !!!!
 
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Old Dec 5, 2025 | 11:39 PM
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Dear Jaguar Enthusiasts,

The knock problem was finally solved by additionally replacing the left front lower rear control arm with the ball joint and the sway bar end links. Now she drives almost like new.

Best, SP
 
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Old Dec 6, 2025 | 12:44 PM
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That seems to come from a different member than the one who started the thread.
 
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Old Dec 6, 2025 | 02:21 PM
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Sorry, posted to the wrong thread, SP
 
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Old Dec 8, 2025 | 08:34 PM
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Bushing on bottom of shock? I had a rear that lost all the rubber.
 
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