Direct Ignition Replacement
Many cars now use Direct Ignition systems with ignition coils integrated
into an assembly that connects directly to the spark plugs.
Diagnosing problems
with Direct Ignition systems can be challenging, but once a faulty Direct
Ignition system is diagnosed, it can be replaced very easily.
It is best to make sure the car has not been operated for several hours.
This allows the engine to cool down, and also allows any high voltage
possibly stored in the direct ignition subsystem to be discharged. To replace
the direct ignition system disconnect the cable that connects it to
the engine control subsystem. This cable is keyed, so that it is
only possible to re-connect when the pins are aligned properly. There is
also a locking mechanism on the connector, that snaps into place to assure
the connector does not come loose. For cable removal it is neccessary to
unlock this connector. Gently pry the purple tab out as shown below.
Next, remove the 4 torx bolts that hold the direct ignition cartridge on top of
the engine and lift it out. (Note: a screw driver for this is provided with the spare
tire) Take special care to avoid making contact with the spark plug connectors on
the direct ignition assembly removed from the car since it is possible that electrical
energy maybe stored in the unit.
The new direct ignition system should now be installed onto the spark plugs.
The 4 torx bolts should be tightened, and the cable re-installed. The keyed
connector should be snapped into place to complete the installation.
Currently, Saab USA is replacing certain direct ignition units for 2000-2002
9-3 & 9-5 models free of charge. Contact your Saab dealer or call 800-955-9007.
Direct Ignintion Modules are available from the Saabsite.
last update Feb 15, 2006