Date: Sat, 22 Sep 2007 20:32:47 +0100
From: Eeyore <rabbitsfriendsandrelationsnospamail.com>
Subject: Re: Intermittent engine vibration


Doug Schwarz wrote: > "Jim M" <jbmoore3nospamnospamast.net> wrote: > > >> Doug Schwarz wrote: > > > > > Any other thoughts, anyone? > > > > > Have you checked the inside of the distributor cap to see if it's clean. > > Many of the non-turbo's (including my 1995 900S) have a leaky distributor > > shaft seal. Mine's done it for years. It's only a little oil that gets by, > > but every a few months it accumulates and I notice the idle is less smooth > > and it's more difficult to start off from a stop(5sp-M/T). Lately I just > > pull and clean the cap at every oil change (3k miles) and that works fine. > > > Thanks for the suggestion. As it so happens I have just come in from > having done exactly that! Yes, there was some oil in there, but not > very much. I cleaned it up and took a short test drive, but the > vibration was still present. > > I visually inspected all the HT wires and they look to be in quite good > shape. I'll have to look at the service records to see when they were > last replaced. I realize that you can't tell if they're faulty just by > looking at the outside, but if they're new they're most likely okay. Sometimes things just fail unexpectedly. Plugs can develop degraded insualtion for example. I had a Vauxhall once that behaved a bit like your Saab. The problem turned out to be a hairline crack in the distributor cap. Graham

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