going from 91 to 87 gave me CEL! FLAME ON

[The little red pill]

that's what you get for using 87 octane. Not only do I use 93, but I add octane booster to give me about 97 octane. I even have a NOS sticker on my car to prove how cool I am!

Seriously though, most likely the gas cap! I had it happen to me on a different car. I actually had to get a new gas cap, because the rubber gasket on mine was bad.

[mikenacarato]

Originally Posted by The little red pill

that's what you get for using 87 octane. Not only do I use 93, but I add octane booster to give me about 97 octane. I even have a NOS sticker on my car to prove how cool I am!

Seriously though, most likely the gas cap! I had it happen to me on a different car. I actually had to get a new gas cap, because the rubber gasket on mine was bad.

you know you will foul your plugs out right? octane increased additives will burn them up. if you have been doing it for a few tanks, pull a plug and see if its turning an orangy burnt color. your eating away the electrodes.

[IllusionX]

Originally Posted by mikenacarato

you know you will foul your plugs out right? octane increased additives will burn them up. if you have been doing it for a few tanks, pull a plug and see if its turning an orangy burnt color. your eating away the electrodes.

As is, higher octane will not do any harm, nor give better performance/mileage.

The only thing is that SOME companies put cleaning additive to their premium fuel. If the engine is not knocking, there's no reason to put higher octane fuel.

/end of discussion.