Re: 99 9-3 convertible backfires - Saab 9-3SS Bulletin Board - Saabnet.com
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Re: 99 9-3 convertible backfires
Posted by Dean [Email] (more from Dean) on Fri, 18 Feb 2005 07:37:22
In Reply to: Re: 99 9-3 convertible backfires, Jerry, Fri, 18 Feb 2005 07:27:13
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I would not ignore this until the next service, if the cat is damaged, the cost can be over $1000, and a lot more if the O2 sensors are damaged too.
Pulling and reading the plugs lets one know something about whats going on in the cylinders. Easy to do and should be the first thing that is done for any running/starting problem.
Short trips and a 7ES (cold) plug installed would lead to carbon fouling of the plugs. 7ES should be fine with predominate highway miles. For your application, the BPCR6ES11 plug would be the right plug. And when reading the plugs, one does get to double check the spark gap. And it is not impossible for a low miles DI to have problems.
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