Throttle Body occasional limp mode - Fix - Saab 9-5 Bulletin Board - Saabnet.com
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Throttle Body occasional limp mode - Fix
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Posted by Ro from Woodbridge [Email] (more from Ro from Woodbridge) on Thu, 25 Jun 2020 15:11:17 Share Post by Email
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2008 Saab 9-5 SC AUTO 125K

Three weeks ago attempted TB Potentiometer (pot) cleaning as vehicle would randomly go into limp mode on a slight pavement incline at ambient temps above 70 deg F. ECU would throw two codes P1230 and P1231 could also notice before limp activation on freeway speeds that rpm's would randomly wander slightly back and forth as well as unstable hesitant idle on occasion especially when cold.
Googled the procedure, found some information what's involved and illustrations as to how to get to the carbon disks (pots) etc...

Removed TB, removed black plastic cover housing internals, disconnected and removed induction magnet / coil pack, removed nut holding permanent magnet and removed magnet itself.
Soaked two carbon disks ( pots) with a lot of electrical contact cleaner. With a slight longitudinal play in the TB shaft, was able to spray in between pots while tapping slightly with a rubber mallet on the TB shaft and rotating it back and forth to dislodge carbon build up. Repeated procedure a few more times and assembled everything back. While at it, cleaned carbon build up ( not much ) from TB underside butterfly and housing. Installed TB back in the vehicle.

Three weeks have passed with regular driving, vehicle drives and accelerates very smooth now, accelerates better/faster under heavy loads, engine idle speed is constant and smooth. Since cleaning, TB did not go into limp, and hopefully won't go into it for a while which would saves me from obtaining brand new TB.

I hope this information helps someone here for vehicle experiencing similar symptoms.
Cheers, Keep on SaaB'n
Ro

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