Date: Wed, 14 Apr 2004 20:46:18 -0300 From: Dexter J <lamealameadingdongnospamlamelame.org> Subject: Re: APC problem, Saab 9000CS lpt Bucking under boost
Salutations: On Thu, 15 Apr 2004 23:41:39 +0100, Anthony Cooke <ant7t5nospamali.co.uk> wrote: > sticking wastegate valve.... Does anyone know how I would test it? I > could > spend a fortune fault finding (well, I could if I had a fortune) > Sorry for dropping in on the thread so late. In my 89 non-DI 9000 I (and two previous owners) had exactly the same trouble - it turned out to be a basic ignition problem. Under boost a seal was leaking oil onto a spark lead and grounding it out momentarily so suddenly and quite violently - the engine management system would cut in assuming a knock. The previous owner had rebuilt the tranny and replaced the turbo outright to no avail and my shop only figured it out by accident as the same sort of grounding situation sometimes occurred on Buicks with a distributor head mounted sideways. You are running DI in that unit I know - but perhaps you want to swap out your plugs and test for grounds. Check around for excess oil under the DI, see if the control wires are clean and tidy and have the DI tested. I'd also pull apart any wire couplings I could find right back to the APC checking for corrosion too. It may very well be the wastegate and/or a problem with the battery/alternator and/or the APC computer - but I'd confirm the ignition system first given that the knock management system seems to kick in given almost any variation in firing. Cheers and best wishes. -- J Dexter - webmaster - http://www.dexterdyne.org/ all tunes - no cookies no subscription no weather no ads no news no phone in - RealAudio 8+ Required - all the Time Radio Free Dexterdyne Top Tune o'be-do-da-day En Vogue Salt n Pepa - What a Mighty Good Man http://www.dexterdyne.org/888/168.RAM
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