Question about 1984 Cadillac Eldorado

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Service engine light came on after i put in gas other than premium

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  • jhcherryhill Jan 04, 2009

    i don't have a knock but the check engine light continues to come on



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Actually the Eldorado does require 91 or higher octane ... It's needed to cause the proper detonation and pressure for your cylinders to cycle!
They didnt just mention it in the manual to make gas stations rich!

But yea, u wanna make sure the gas cap is on tight!

If it came on right after putting in lower than 91 I would run my car to E then fill up with Shell preferably

Posted on Apr 11, 2009

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Your car does not require premium fuel. If you have a lead foot and live in a hilly area, it's possible you're causing knock. Best bet... check that your gas cap is tight.

Posted on Aug 20, 2008


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Posted on Jan 02, 2017

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SOURCE: will your service engine light come on if you put different fuel in tank

The answer is NO, you have an unrelated problem that just happened to come up at the same time. Have your trouble codes checked.

If you need further help, reach me via phone at

Posted on Jan 05, 2012

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Will your service engine light come on if you put different fuel in tank

The answer is NO, you have an unrelated problem that just happened to come up at the same time. Have your trouble codes checked.

If you need further help, reach me via phone at

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