Sounds like really bad pinging (timing? Gas?). 

But, I would start by looking for loosened ancillaries. 

Chris.

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Dnia Dec 18, 2011 o godz. 12:00 grant l lindberg <grant_lindberg@HOTMAIL.COM> napisał(a):

> Severe loss of power + rattling sounds from '90 engine.   I made a short recording - the rattling is most pronounced after 6 sec,  around 8 sec there is a "clunk",  rattling is in the recording is not as noticeable after this.
> 
> http://dl.dropbox.com/u/13252992/vanagon%20engine.mp3
> Any ideas what might be happening?    I'm debating whether it will be worth towing it to shop; I fear that repairs will be too costly.   Also,  any recommendations for engine repair shops  in the SF bay area?   Thanks!