Date: Fri, 23 Nov 2001 22:16:10 -0500
From: "Tony at" <>
Subject: Re: 84 900 Rough Warm Idle

The most likely problem is the warmup regulator. They have the symptoms you describe when they are failing. Tony "Jonah" <> wrote in message > Greetings loyal Saab owners. My 84 900 has 231K, burns no oil and has > run perfectly until now. Cold idle runs fine, but once the car warms > up, idle is erratic. I have checked many posts to this group and > cannot investigate the likely culprit since there is no AIC on an 84 > 900. In trying to diagnose the problem by looking for vacuum leaks, > turns out if I pull off the small vacuum line from the manifold, the > car goes from rough idle to a smooth idle. This tells me that I don't > have a vacuum leak, but instead, something that is supposed to turn > on/off after the car warms up isn't. Any suggestions? Thank you in > advance. > > Jonah

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