Comments on: 87 octane in an engine that requires 93–what happens? http://www.ricksfreeautorepairadvice.com/repair-topics/fuel-pump-and-fuel-deliver/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93 Car Repair Questions Answered FREE Fri, 03 Sep 2010 16:18:41 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Anonymous http://www.ricksfreeautorepairadvice.com/repair-topics/fuel-pump-and-fuel-deliver/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/comment-page-1#comment-377 Anonymous Tue, 21 Oct 2008 05:38:00 +0000 http://www.ricksfreeautorepairadvice.com/testblog/uncategorized/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/#comment-377 you rock ! keep up all of the good work we really appreciate your expertise.<br/><br/>sincerely, a fellow car DYIer you rock ! keep up all of the good work we really appreciate your expertise.

sincerely, a fellow car DYIer

]]> By: Anonymous http://www.ricksfreeautorepairadvice.com/repair-topics/fuel-pump-and-fuel-deliver/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/comment-page-1#comment-376 Anonymous Tue, 14 Oct 2008 22:21:00 +0000 http://www.ricksfreeautorepairadvice.com/testblog/uncategorized/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/#comment-376 I will agree that a car thats suppose to use 91 or higher should be using higher octance as labeled on the gas cap, owners manual or gauge cluster.<br/><br/>Few people might not agree but I have a 2.0L Turbo DOHC Mitsubishi 4G63 motor in my car. Today I made the mistake of using 87 octane, only since I am runing lower boost 9lbs vs. 25lbs. Well as I drove I started to get misfire codes. Car would take off, hail butt then at a cruizing speed would misfire. I pulled out my scanner to see that I had code P0300 and my P0400(motor swap removes EGR). I now have a misfire till I refuel with 91 or above. How this helps! I will agree that a car thats suppose to use 91 or higher should be using higher octance as labeled on the gas cap, owners manual or gauge cluster.

Few people might not agree but I have a 2.0L Turbo DOHC Mitsubishi 4G63 motor in my car. Today I made the mistake of using 87 octane, only since I am runing lower boost 9lbs vs. 25lbs. Well as I drove I started to get misfire codes. Car would take off, hail butt then at a cruizing speed would misfire. I pulled out my scanner to see that I had code P0300 and my P0400(motor swap removes EGR). I now have a misfire till I refuel with 91 or above. How this helps!

]]> By: Rick http://www.ricksfreeautorepairadvice.com/repair-topics/fuel-pump-and-fuel-deliver/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/comment-page-1#comment-378 Rick Wed, 14 May 2008 15:24:00 +0000 http://www.ricksfreeautorepairadvice.com/testblog/uncategorized/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/#comment-378 Sorry Randy, We'll have to agree to disagree. I have a friend who put 87 in her 2000 Acura TL, hardly an "ulta high performance" engine. The PCM lit up the check engine light like a Christmas tree. A scan showed misfires on all cylinders. All in all, it's a bad idea. You can try this with your car and your friends, but I'll advise my readers to avoid this where ever possible. Sorry Randy, We’ll have to agree to disagree. I have a friend who put 87 in her 2000 Acura TL, hardly an “ulta high performance” engine. The PCM lit up the check engine light like a Christmas tree. A scan showed misfires on all cylinders. All in all, it’s a bad idea. You can try this with your car and your friends, but I’ll advise my readers to avoid this where ever possible.

]]> By: Randy B http://www.ricksfreeautorepairadvice.com/repair-topics/fuel-pump-and-fuel-deliver/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/comment-page-1#comment-379 Randy B Wed, 14 May 2008 14:40:00 +0000 http://www.ricksfreeautorepairadvice.com/testblog/uncategorized/what-happens-if-you-use-87-octane-in-an-engine-that-requires-93/#comment-379 Sorry, your answer only applies to very few ultra-high performance engines. In most modern engines the computer will not be 'chasing an unknown', it will find the timing that eliminates pinging. There is no damage risk to the cat. You'll be gaining money, the only question is whether the loss in economy (if any!) is greater. If you use regular, hear no pinging, and lose little/no mileage, then there's no problem. Sorry, your answer only applies to very few ultra-high performance engines. In most modern engines the computer will not be ‘chasing an unknown’, it will find the timing that eliminates pinging. There is no damage risk to the cat. You’ll be gaining money, the only question is whether the loss in economy (if any!) is greater. If you use regular, hear no pinging, and lose little/no mileage, then there’s no problem.

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