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Date: 26 Aug 1997 21:06:09 -0400
From: (Ken Bell)
Subject: Re: Question: My Saab hunts at idle..any ideas?

In article <>, Rob MacMahon <> wrote: >I am the proud owner of an 89 saab 3 door. Cute car. But after I ahve >gotten her warmed up and done a nice long run, If I stop, I get a hunt >in the idle from 500 rpm to 1200 rpm, which is not consistent. It goes >down, attempts to die, and then thrums back up into the 1200 range. >Almost like its overcompensating. Any ideas? My dealer keeps telling >me its broken vaccum lines, but this is the third time I have had this >in as many weeks. Quite frankly, I think my vacuum lines are fine. Do you just think that your vacuum lines are fine, or have they been replaced recently? If they are original, take your dealer's advice and just replace all of them (for a total cost of approximately $5 at you favorite local parts store, for the all of the small diameter hoses). As I'm sure you know, old rubber hose gets hard and brittle, doesn't seal well at the fittings, and cracks when stressed. Also check the large intake hose that goes to the throttle body, and if you have a turbo, check the large diameter hose there also, as well as the pressure relief valve whose diaphragm can rupture, causing a vacuum leak. Take off the large diameter intake hose from the throttle body and see if it is leaking, sometimes it tears. More important, clean out the throttle body carefully with carb cleaner spray, and wipe it with a soft lintless cloth, being careful to not bend the butterfly valve mechanism. There are certainly more expensive possibilities, the air mass sensor being a popular (just kidding) one, but I think that your dealer is honestly trying to steer you in the right direction by pointing to what is likely due to a vacuum leak. -- Ken Bell :: :: (212) 475-4976 (voice) ======== :: :: (212) 678-5516 (voice), 678-5552 (fax)

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