FUEL CONTROL MODULE ISSUES (ADVANCED)
Thanks to A Special Thanks to Kevin Johns for the contribution of these photos. Thanks Kevin! for contributing to this FAQ!
This repair is designed to fix cold starting issues with your Saab 900 and Saab 9000 cars up to 1990. A common issue exist where the hybrid circuits in the fuel control module malfunction causing incorrect fuel ratio during cold start (in very basic terms). When this happens the engine would crank during cold start and die repeatedly until the engine warms up enough where the fuel control module gets its readings from the Oxygen sensor instead of the coolant temperature sensor. The engine would no longer die and it would run fine until the engine cooled (usually overnight). Here is the repair:
| STEP 1 | Remove the Connector to the blue topped Coolant temperature sensor |
| STEP 2 | Cut the yellow wire and go to radio shack and buy resistors ranging from 100 ohms up to 300 ohms. Install a 100 ohm resistor in the yellow wire as pictured below (soldering it). You may have to change out the resistors each morning until you find the resistor amount that works best for your climate. In most cases you can tell when have too much resistance in the wire because the idle will be too high and you will not able to adjust the idle down. |
Pricing for 9000 Fuel Control Module (Fuel System & Related)