No everything's in order. Had a big screwdriver as a stethoscope but cant pin it down. Just wondered if the injector pump could be the problem as I've heard. As I said starts, runs and accelerates well.
I initially thought injector but it runs lovely. I dont understand how it disappears on higher revs unless somethings out of balance.
... IME, the good ones last about 80K miles - the chocolate ones maybe 80 mins 
So you reckon my vac pump at 200K will be carped? It's not making a noise, but has been mentioned it may be aiding my oil consumption+1 - My first port of call with 300's which present with such issues - usually it is this too ... closely followed by, it's only just had one fitted
Easy enough to take it orft the block, and cover the hole with something sensible, start the injun and see if the noise goes away .....
Failing that, as others have said - injector washer(s) or one of the belts - either aux ( serpy ) or timing - when was it last done ? ( given it goes at half engine revs - this can be a tell tale - as can a load of rubber gunge in the timing case drain hole )
So you reckon my vac pump at 200K will be carped? It's not making a noise, but has been mentioned it may be aiding my oil consumption
I'd be surprised if the poppet valves are still working well at that mileage, but, again, some of them must have been made correctly, simply due variations in tolerances - you might have the exception that proves the rule... but, yeah, it probably kaput.....
Any particular electric one you'd recommend?Well, it's well beyond the MTBF which I have seen - but clearly, there must be a good one out there
Indeed - though I have seen a small number let go quite badly - low engine oil ( or crap oil ), and the thing seizes up, and then goes bang .... i even tried bolting one back together years ago..... waste of time ... first loss was the best one
I think any of mine that disintegrate, I'll replace will be with an electric one....
Ahh, thought you'd seen a few set up. I might have a look at those on eBay. CheersI've no experience to base anything on - but the Aussie's seem to have good results with the Facet ones, which seems a bit dear to me, and also the Audi ones - which are cheapish on the bay
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