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Old 07-15-2009, 05:38 PM   #1
Kal
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Shell gas is causing Engine light to come on

This is a wierd issue. I had my check engine light on for months for an 02 sensor .. finally got around to replacing it about 6 weeks ago.

Check engine light goes off .. I fill up my tank with Shell 91 and all the sudden lights on again .. I assume it will go off .. well it doesn't .. so next time I filled in gas I used sunoco 92 just because it was closer to me at that time .. Now there is no check engine light on .. I put in shell again and light comes back on .. WTF? Now I try using Esso Premium and light goes off! I use Sunoco Silver and Esso 89 and light is still off. I put in Shell 91 two days ago and light goes back on!

WTF is going on? Is there something wrong with Shell gas? I used to be a huge supporter of them but there is something fishy going on with their gas.. anyone have any ideas?
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Old 07-15-2009, 06:29 PM   #2
specs18
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I always thought the order of precedence was:

Sunoco 94 (cleanest)
Shell
Petro
Esso (dirtiest)


.. funny you mention that. My cousin had the exact same issue with his 98 Mazda6 v4. He always used to go to Shell, until he put in Esso one day and his check engine light went off. (easy fix!) Apparently it is the additives in the Fuel! In your case, stick with what works ... Esso, PetroCanada both say they use some additives/detergents or something on the gas nozzle.

Last edited by specs18; 07-15-2009 at 06:33 PM.
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Old 07-15-2009, 06:53 PM   #3
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V Power is conflicting with M Power
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Old 07-15-2009, 07:33 PM   #4
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V Power is conflicting with M Power
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Old 07-15-2009, 07:35 PM   #5
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V Power is conflicting with M Power
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Old 07-15-2009, 08:05 PM   #6
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Is this Shells new Nitrogen enriched gasoline that's causing you these problems?
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Old 07-15-2009, 08:23 PM   #7
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That shell Nitrogen crap is such a big marketing scam. Most fuels already have cleaning additives in them. Only use fuel that is recommended in your owners manual for a stock motor. If you're running boost or higher compression, thn run Ultra 94.

Believe it or not, Esso gas is rated up there with Sunoco as the cleanest.

I stay away from Shell or Petro Canada.

Im happy my crx owners manual states (91 RON) 87 octane .
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Old 07-15-2009, 08:25 PM   #8
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out of all the gas - shell has the highest sulfuric acid content. This is what is causing your problem. back in the late 80's the e34 V8 530's were having knocking blow by ring problems. The sulfer was eating away at the cylinder wall coating and this wasn't a design flaw as first thought, but our gas was different from European gas which didn't affect the engines. I don't know if this has changed much since but could be along with the Nitrogen enrichment.
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Old 07-15-2009, 10:14 PM   #9
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+1 "That shell Nitrogen crap is such a big marketing scam" My car runs best with Sunoco or esso. Everything else makes my car knock or some sort of clicking noise when I'm driving.
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Old 07-15-2009, 10:33 PM   #10
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Everyone puts down Esso, but personally, I see nothing wrong with Esso. I've been using is steady for years, including the high mileage 540 I had, with no issues at all. People on this board ranked Shell and Sunoco as first and second, yet there are issues with Shell. hmm
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Old 07-15-2009, 10:44 PM   #11
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there goes all my air miles......
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Old 07-16-2009, 12:11 PM   #12
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Quote:
Originally Posted by Kal View Post
This is a wierd issue. I had my check engine light on for months for an 02 sensor .. finally got around to replacing it about 6 weeks ago.

Check engine light goes off .. I fill up my tank with Shell 91 and all the sudden lights on again .. I assume it will go off .. well it doesn't .. so next time I filled in gas I used sunoco 92 just because it was closer to me at that time .. Now there is no check engine light on .. I put in shell again and light comes back on .. WTF? Now I try using Esso Premium and light goes off! I use Sunoco Silver and Esso 89 and light is still off. I put in Shell 91 two days ago and light goes back on!

WTF is going on? Is there something wrong with Shell gas? I used to be a huge supporter of them but there is something fishy going on with their gas.. anyone have any ideas?
The gas is fine, something is wrong with your car.

The next time the engine light comes on, pull the code.

My guess it will be a "Catalyst efficiency below threshold" When your cat gets older, it can't work good enough (>80%) with some additives.

I have only used Shell for years and so far no codes. (except for secondary air too lean, but that was a bad secondary air pump)
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Old 07-16-2009, 01:14 PM   #13
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Usually we put gas at the station close to home etc, I found that some gas station is really bad, so try different location
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Old 07-16-2009, 01:25 PM   #14
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i run shell V-power almost exclusively in my 328. Doesn't miss a beat.
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Old 07-16-2009, 01:49 PM   #15
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you might not be clicking your gas cap hard enough, orrr since you fixed you're 02 sensor, try looking up the code like mentioned above.. you might have a simple crack in the air intake boot that you can't see.... Those tend to pop up engine lights here and there...
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