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Re: Are Bosch Super 7553 spark plugs ok for my car? Posted by Ari [Email] ![]() ![]() In Reply to: Are Bosch Super 7553 spark plugs ok for my car?, Jim in CT, Mon, 28 May 2001 15:46:27 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The Direct Ignition system (which we all assume is what your car has) uses the spark plug as a sensor for conditions inside the cylinder. Pretty clever, but it means the spark plug has to be EXACTLY the right one for things to work.
For years NGK was the only manufacturer who made a plug that met Saab's requirements. In the past few years, Bosch started making plugs to work with the DI. Some folks have had success, others weren't so lucky. I've had the Bosch work in a DI equipped Non-turbo, but I didn't find them to be as good as the NGK's.
Spark plugs are a lot trickier than they look, and with the DI, they become critical. Just because there is a cross-reference in some auto parts store that says Blast-fire 901's will fit doesn't make it so.
There are a lot of funny (or not so funny) things that happen with the wrong plugs, from a Check engine light to just hesistation and misfiring to a blown DI cassette (that will be $300 please). We know the NGK's work - the jury is still out on others. Sometimes they do, sometimes they don't. If you feel like experimenting, go ahead. But the proper NGK's properly gapped are pretty trouble-free - why look for trouble? Mail order a few sets and you'll be fine.
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