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Posted by Jeff Malin (more from Jeff Malin) on Fri, 2 Mar 2001 03:00:10
In Reply to: Re: Weird throbbing of power at high boost in '88 9kt, Jeff Malin, Fri, 2 Mar 2001 02:55:14
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Forgot to also add:
The "boost up, than power down, then boost back up" cycle that it sounds like you're having may be due to small holes in the vacuum hose that you can't see... I.E. the holes open up at higher boost and cause the boost to drop, upon which they close and allow the boost to build back up... are you seeing your turbo gauge do an up-and-down dance with wide open throttle (or near it)?
Also check your plugs, make sure they're the correct type and gapped correctly - I don't know off the top of my head what you should be using, but if you search the list archives I'm sure it's in there.
One more thing, if your APC valve (the one on the radiator with 3 vac-hoses and a couple wires) is buzzing at idle, and the buzzing cuts out when you tap the brake, the chances may be that either your knock sensor or turbo pressure sensor are malfunctioning. Either one could theoretically cause the high-boost problems you're having.
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