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Posted by BillJ (more from BillJ) on Fri, 7 Feb 2003 07:42:57
In Reply to: Re: Spark plug recc's for Aero, Bill Davies, Fri, 7 Feb 2003 04:39:21
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The reason that *only* this plug will work is because the Saab Direct Ignition (DI) system uses the plugs as sensors for various combustion chamber conditions. This system was developed using the NGK plugs Bill Davies mentions and since it uses properties of the plugs not usually specified by manufacturers, no other manufacturer can claim to supply an "equivalent" plug for this particular application.
A number of people posting here and elsewhere have tried to "upgrade" to Bosch plugs, although I'm not sure what the claimed benefit is. After often working fine for a short while, they almost invariably develop problems with misfires or low/inconsistent boost.
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