Thread: Is everyone using 91 octane?
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Old 05-14-2008, 02:05 PM
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santoli3 santoli3 is offline
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Join Date: Aug 2004
Location: SE Virginia
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Quote:
Originally Posted by lowmileage View Post
...IMO a car specifically not designed to run on premium (like one with an under 9-1 compression) should actually run better with a Plus 89 octane or Regular 87 octane fuel..
I have a 92 Ford Ranger that sometimes exhibits pre-ignition under load. So for a while there I was using high octane fuel to prevent this. After a while it started suffering hesitation upon acceleration. I wasted a lot of time trouble-shooting this before I came upon a technical bulletin for the hesitation condition. It basically said to tell the client to stop using premium fuel.
I did. And the hesitation went away.
Later when perusing the owner’s manual I found a note proclaiming that slight pre-ignition is normal and harmless, and that premium fuels should not be used...
What do you know?
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