Date: 23 Dec 2001 07:00:46 -0800 From: johsnopsamanytime.co.uk (Johannes H Andersen) Subject: Re: Fast idle on 85 900T
"Grunff" <runffnopsamo.co.uk> wrote in message news:<hyiV7.18614$4f7.2207907nopsam11-gui.server.ntli.net>... > "Taflet" <nospamnopsam.now> wrote in message > news:j96a2us8de3c9nuhi5qju4ikhoqpro0j6rnopsamcom... > > Hello everyone, > > > > Last night I decided to run the Saab a bit hard (top yellow range of > > the APC gauge) for a short period, and soon after that the idle speed > > climbed to around 1900-2000 rpm range. I checked for loose vacuum > > hoses, but the idle isn't hunting (as a vacuum leak would suggest) - > > it's a racing idle. > > > > I dropped into the local Saab dealership and he suggested that perhaps > > a chunk of carbon got dislodged and is stuck in the idle control motor > > - and that I should try taking out for a hard run again to dislodge > > it. I've been doing a lot of city driving so that seemed a possible > > cause (carbon buildup). I tried going to www.saabnet.com , but the > > website seems to be down or something (getting about 5KB/s on my > > broadband connection). > > > > If anyone here has any additional suggestions I could check out, I'd > > very much appreciate it. > > > I'm willing to bet it's a vac leak. This happens quite often, when you push > a turbo car more than you normally would, you pop off a hose. Vac leaks > don't always cause hunting; it depends where the leak is. > > Check all your hoses, carefully. Use an unlit butane/propane torch around > the ends of each hose. When you come to a leaky one, the idle will shoot up. > > > Grunff Yes, very likely. I while back I reported on how I has found such a vacuum leak. It was a small diameter hose that was split at one end. The spilt was hidden from direct view, but a faint whistle brought me to look closer. I cut an inch off the hose and bingo! - the idle went back to normal. Johannes
 |
 |
 |
 |
 |
