Originally Posted by
Frank Wulfers
The 2.3T engine in the 9-5 has never been the smoothest but the problem you're describing is unusual.
My previous 2006 9-5 had some idle problems and that was caused by loose vacuum house on the throttle body. A local car parts store suggested adding HEET to a tank off fuel in case there is a water in the tank.
There is a TSB in the WIS but it doesn't sound exactly like the same problem. What are the RPMs on your car? When was the last time the spark plugs were changed?
TECHNICAL SERVICE BULLETIN
Bulletin Nbr: 248-2565
Date:...........Juni 2005
Market: US/CA
Vibration at idling speed
Cars affected
Saab 9-5 M98- with engine alternative B205, B235 and B308
Background
In certain vehicles, the vehicle may vibrate when it is stationary.
Vehicles equipped with automatic transmission may have the idle speed set higher than the typical idle speed. While the vehicle is in this condition, the driver may experience abrupt shifts as the shift lever is moved from park to drive or reverse.
Symptom description
Vibration in the body while stationary. Abrupt shifts as the shift lever is moved from park to drive or reverse.
Parts required
Not affected
Procedure
1. Establish whether the car has idling speed vibration problems or shifts abruptly.
2. Adjust the engine's idling speed. Connect Tech2.
• • • • • • •
If the car exhibits vibration problems during cold starting for example, then the speed should be increased at a minimum (10 - 30 rpm). If the problem remains at all engine temperatures, then increase the speed by more than 30 rpm.
If the vehicle shifts too abruptly when engaging gear, lower the engine speed in steps of 20 rpm.
If the car is equipped with automatic transmission then the customer should be informed that the tendency to shift abruptly will increase if idling speed is increased.