Time for another round of collective wisdom regarding a poorly described car problem.

The car: Saab 9-3, 2007, 2.0T, auto

The symptoms: Upon start up vehicle has trouble maintaining a constant idle. For about 20 seconds it hunts. Sometimes is seems like it is about to stall but comes back up. After 20 seconds, it is gone and car idles normally. Car runs normally at all other times. This only occurs on a cold start up, mornings and sometimes in the evening on the way home from work. When running errands, symptoms to not present themselves. Forum searches do not turn up similar symptoms.

My guesses:

  1. Carbon buildup in the throttle plate.
  2. Dirty fuel injectors

My attempts at solutions

  1. Cleaned throttle plate with throttle body cleaner and a q-tip.
  2. Added a couple bottles of Lucas fuel system treatment.


For your time, an old car. I’ve really started to appreciate pre-war stuff lately.