from 89 to 87 octane - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-21-2006, 02:00 PM   #1
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Default from 89 to 87 octane

since i've had my car I've always used 89. my wife put 87 octane in my car and almost immediately my gauges went hay wire. While driving all the gauges would spin at the same time, the check engine light would come on, the car would sputter but it would not cut off. So I've continued to us 87 in her to make sure we had no problems but every now and then the same thing would happen but the car wouldn't cut off.
Should I go back to 89 and if so how long should I wait? I do have a code for the knock sensor, should I replace this asap.
any help would be appreciated.
thanx
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Old 07-21-2006, 02:08 PM   #2
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I would use the 89 in it (and do in my car). If you have the owner'* manual, it will tell you what the recommended octane is for your car. I'd have to verify mine to be 100% sure, but I believe it lists 90 octane for mine.

If you already have a knock sensor code (KR), then you would be wise to return to the 89 next tank.

I don't know why your guages went haywire though, so someone else will have to chime in on that.
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Old 07-21-2006, 02:42 PM   #3
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Lower octane WILL NOT make your gauges go haywire. A dying battery/alternator or loose gauge harness will.
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Old 07-21-2006, 04:08 PM   #4
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Quote:
Originally Posted by lash
I would use the 89 in it (and do in my car). If you have the owner'* manual, it will tell you what the recommended octane is for your car. I'd have to verify mine to be 100% sure, but I believe it lists 90 octane for mine.

If you already have a knock sensor code (KR), then you would be wise to return to the 89 next tank.

I don't know why your guages went haywire though, so someone else will have to chime in on that.
87 is the requirement for all L36'*... But the L67 lists 91 or better

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Old 07-21-2006, 07:34 PM   #5
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my car is a l27 so i'm assuming i should use the same octane as a l36
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Old 07-21-2006, 07:35 PM   #6
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Quote:
Originally Posted by strongsun1
my car is a l27 so i'm assuming i should use the same octane as a l36
yes you car is desinged to run on 87
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