Clunk and Power issues - 1998 Amazon VX

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Joined
Oct 27, 2026
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Midlands
Hello!
I have just inherited my Dad's 1998, 100 series, 4.2L Diesel VX Amazon and I love it! It has been in the family since 2004.
It is in great condition and has been really looked after. However, I have a couple of issues that I need some help with:

1) Clunk Noise/feel - when idyling the throttle and/or re-engagaing the throttle - noticeable Clunk when it re-engages. I suspect Prop-shaft U-Joints - either need replacing or re-greasing.
Any advice? Is it best to just swap out the whole prop-shaft (looks reasonably affordable to buy and straight forward to replace??) - better to just get a garage to do it?

2) Lack of Power on acceleration.
From a stand-still - initial response on applying throttle feels normal. However past 1st gear - there is a sever lack of power. Revs don't climb abnormally, but it just gains speed really really slowly. It is particulary bad and noticeable when going up any sort of hill (even a gradual hill), it just crawls along and only slowly gains speed. Rev's don't pass 2000rpm.
I suspect a Turbo issue or maybe a fuel supply issue?? - But can't seem to narrow it down. Can't see any air leaks or vacuum leaks. Fuel Filter is pretty new and didn't fix the issue.
Any advice on likely culprit?
The Turbo is original.

Any advice greatly appreciated. I'm pretty handy and happy to do work myself. However, if its just best to get professional help then I'm open to that too.

Cheers
 
For anyone interested - I think i have solved the Lack of Power issue HOORAY! :

The MAP Gas/Turbo sensor filter (Toyota OEM part number 90917-11036) had a massive Crack in it (see attached images)
I have removed this and bypassed it with a bit of tube and acceleration seems to have come back!


Now to solve the Clunk Noise...

WhatsApp Image 2026-10-27 at 15.17.40.webp


WhatsApp Image 2026-10-27 at 15.17.29.webp


WhatsApp Image 2026-10-27 at 16.27.09.webp
 
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