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Discussion Starter #1
When at 5-7k rpm's in 2nd, 3rd, and, 4th gear, my completely stock '04 WRX spudders.. it wont go through the 5-7k rpm range smothly, it seems like a transmission problem almost like it's slipping but i dont feel anything on the shifter just the engine spudders. It came up with an check engine light once.
Whats wrong!!??:confused:
 

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Discussion Starter #4
I did accidentally fill it with non-premium gas a tank ago so i added two octaine boost bottles to try to get it back up to premium intead of dumping the tank of non-premium gas, and when that tank was 2/3 gone it started to do this. I have used premium every tank before, I just goofed on that one.
 

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Take it easy until you burn the rest of that tank out, no high RPM's or high loads. Fill it with premium, then reset your ECU. Try again. If problems persist let us know.
 

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Ok ill try that, how do I reset my ECU?

Remove the battery cable and depress the brake for a few seconds. Octane booster doesn't really work BTW.. unless you used like a gallon of toluene, that's what I used to use as injector cleaner/octane booster.
 

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Or even easier, just take it to a local auto parts store and ask them to pull the code and clear it for you. They'll do it for free. Post the code up here when you're done.
 

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I did accidentally fill it with non-premium gas a tank ago so i added two octaine boost bottles to try to get it back up to premium intead of dumping the tank of non-premium gas, and when that tank was 2/3 gone it started to do this. I have used premium every tank before, I just goofed on that one.
For future reference.....do not do this, ever. A $50 tank of gas is nothing compared to blowing a motor. My guess is that is exactly what caused your problem
 

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For future reference.....do not do this, ever. A $50 tank of gas is nothing compared to blowing a motor. My guess is that is exactly what caused your problem


Theoretically you could fill your tank with 87 and as long as you don't beat on the car and stay out of boost it will be fine until you can run enough out to top it off with 93. I'm guessing there was a WOT event (or several) with the bad gas that was a precursor to the problem.
 

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Theoretically you could fill your tank with 87 and as long as you don't beat on the car and stay out of boost it will be fine until you can run enough out to top it off with 93. I'm guessing there was a WOT event (or several) with the bad gas that was a precursor to the problem.
Theoretically yes, I still would never do that though. Anything other than 91 goes into my tank (Colorado doesn't have 93) and its getting drained.
 

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From what I've heard, octane booster only increases the octane somewhere around 1/5 of an "ocatane point" or whatever the unit is per bottle.
 

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Discussion Starter #14
Im having the fuel emptied today, My plan is to fill up with premium, change out the spark plugs (its about time anyways), then reset the ecu... Ive been keeping it under 3k rpms lately, does anyone think I did any real damage? I ll get the check engine code today too and post it.
 

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hard to know if there was damage done until you have changed those things and see how it runs. Keep it under 3k for the first fifty miles or so to make sure all the bad fuel is gone from the system
 

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My guess is the check engine light is one or several misfire codes. Which would explain the lack of power, due to not having sufficient octane fuel.
 

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I've had to fill up with non-premium gas in a premium vehicle more than once in my life when I was somewhere in the middle of nowhere that only had regular. I've never had any problems. I just usually put in enough to get me to another station where I can fill it up with the correct fuel.
 

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Plus, the US has a very consistent and reliable fuel supply. For example, in the US when one buys fuel, it's fuel, not petrol diluted with whatever. Low octane in an emergency should be fine. It's just not a good habit.
 

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Discussion Starter #20
THe gas just set it off

After taking it in to get the check engine light checked 3 times with no code when they hooked it up, I finally decided to just do a tune up sense i just got the car 2 months ago and see were that got me. I noticed that the dumb ass that had the car before me put motocross restrictor spark plugs in :whoa: , so i replaced those with double platinum ones, cleaned my mass air flow sensor and replaced the fuel filter.... Now she runs better than ever. :D
 
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