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2001 Seville STS
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98 Posts
Discussion Starter #1
Alright, well I usually put 87 or 89. I decided to use premium fuel, and now the engine is knocking. I remember hearing this before when I used premium fuel but thought it was something else.:yup::yup::yup::yup::yup::yup:
 

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1994 sts
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809 Posts
Hmm, that is very odd.....should be the other way around if anything. I'm pretty sure the computer can adjust for either 87 or 89 oct. and premium is what your supposed to use so it should be fine...lol wierd
 

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STS
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132 Posts
Get a bottle of Lucas Injector Cleaner...
Put it in with 1/4 tank... Go for a good 30 minute ride,
perhaps at times getting into the redline area...
 
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