Re: Plus 4 plugs in turbo engines? - Saab 9000 Bulletin Board - Saabnet.com
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Re: Plus 4 plugs in turbo engines?
Posted by Ken Washington (more from Ken Washington) on Wed, 15 Nov 2000 11:55:22
In Reply to: Re: Plus 4 plugs in turbo engines?, RACR9KT, Wed, 15 Nov 2000 09:32:30
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Everyone has had their experiences. I ran Bosch Platinum single electrode plug in my 83 900T 5 spd, 87 900S and 87 9000S without any problems. I ran the plugs for 30,000 miles before changing. My Saabtech friend tried a set of the Bosch +4 plugs in his 87 9000T 5 spd. He told me his around town mileage per tank increased from 350 to 380 miles per tank and better performance through the middle gears and top end. The +4 plug is another form of multi-spark-distribution. I have been running +4s in my 87 9000S for about 25k to 30k miles. The are still going strong. If you had a head gasket problem, don't blame the plugs fouling on the plugs. That could have caused any plugs to foul, and make sure you use the right plug. The Bosch +4 for non-DI 2.0L engines is 4418. The DI-equipped engines take 4417.
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