Re: Dean, please expand on plug problem - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Dean, please expand on plug problem
Posted by Dean (more from Dean) on Thu, 5 Jun 2003 18:17:16
In Reply to: Dean, please expand on plug problem, Baron In Markham, Wed, 4 Jun 2003 09:30:12
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They will carbon up in the turbo models and at high boost you will get some misfiring after a while. That it turn creates more carbon deposits. At high boost the spark tracks down the carbon and not across the gap. As things get worse, the mis firing occurs at lower levels of boost. The boost pressures determine the break down voltage of the spark gaps.
You cannot adjust the gap on those can you? You need a .035" gap.
They will run fine for a while. Turbo plugs need to be a hotter heat range so that the carbon from on-boost conditions is burnt off when off-boost. Many have walked down the same path as you. It adds to the collective knowledge. I would scold your parts guy. Are this plugs recommended by Bosch for the turbo application or just for the NA engines? If (when) they carbon up, I would expect that you can take them back to the place that sold them to you, as they are obviously a mis-application.
Stick with NGK BPCR6ES11's and gap to .035". Not the .039" recommeded in the owners manual or on the emissions sticker over the rad. These engines do not like trick plugs!
posted by 65.68.101...
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