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pardon if I'm redundant But this seemed really good.
Guide for Direct Ignition cassette and spark plug service - all DI-equipped vehicles
Using non-resistor spark plugs could cause several different types of fault symptoms and driveability problems in the car. The DI uses the spark plugs are used to monitor the combustion process.
An incorrect spark plug gap (excessive wear) can also lead to driveability problems. Use of non-resistor spark plugs could also destroy the DI cassette.
! - Spark plug burn-off - !
Automatic spark plug burn-off is carried out with a burst of sparks each time the engine is switched off. Burn-off is carried out in all cylinders simultaneously and lasts for 5 seconds at a rate of 210 sparks per second.
! -This Is Lethal Current Use Extreme Caution- !
Therefore, it is very important to adhere to the following guidelines :
When replacing the spark plugs it's important to check following:
First Allow 30 seconds for the module to power down then remove the electrical plug to ensure your safety.
Always use resistor type NGK spark plugs. All Saabs equipped with DI cassettes have been specified with resistor type NGK plugs
Verify the correct gap at the electrode (1.0mm -1.1mm)
Check For oil leakage from coil assemblies. This would indicate a failed DI assembly.
Before installation of the DI cassette:
Coat the rubber boots on the cassette with Krytox (P/N 30 19 312) or a name brand dielectric grease.
Check to be sure that the contact springs can be seen inside the coil towers and replace them if they are damaged or missing ( P/N 91 67 032)
Coat the thread of the spark plugs with Molycote 1000 (P/N 30 20 271) or high temperature anti-sieze.
Torque:
Install and torque the Spark plugs to 21 lbf ft
Fit the Cassette to the valve cover and torque to 8.1 lbf ft
Recommended spark plugs for DI-equipped cars: 1990-2001
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