Hello l have a 2.5 TDl  and it has been making a noise similar to Thomas Svensson's van 5th one down on the troubleshooting page [google]. l had to change the vacume pump 2 weeks ago but that did not change the noise! a mecanic changed the hydraulic valve lifters last week but it was not that! On a previous van the fuel pump rod was tapping and it dosent sound like that. A couple of months ago the cam belt was checked but it was not that. Any ideas? The van dos'ent seem to have any loss of power.
Thank you Matt, your answer is rational, it makes sense, will contact you in the future, with either another question or result, thanks. Out of curiosity did you get to listen Thomas Svensson's engine noise [VW T4 trouble shooting] ?
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Hi Matt Still havent had it checked over using your advice , when your idea has been tested i will rate you so you can get your money!