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I would go to the parts store and get some octane booster and add it to the gas, then once you get to about half a tank, top it off with the 91 octane fuel until you can finally fill it with the 91.
This should help with the pinging so it's not a huge issue and it should prevent any problems with the engine.
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Do you know what codes are being stored?
Vehicles in the US are required to run on 87 Octane fuel. So the fact that you put in lower octane fuel shouldn't be causing this problem. Since the car is still misfiring it's likely a problem with the ignition coil.
What is the year and model and engine size of this car please?
Even being a wrx, it is suppose to run on 87 minimum.
So, I think the avenue to take here is to try and get the codes read to determine which cylinder is misfiring.
This might even be covered under warranty depending on the mileage.
Since this engine uses individual coils, it's possible one has failed. Most parts stores will read the codes for you at no charge, then at least you can replace the single coil on that particular cylinder.
Passenger side rear cylinder is #3, as for the random misfire, you get that code when it cannot determine which one is misfiring. So, I would swap #3 with #1 which is the front one and see if the misfire moves with it. If it does, replace the coil, if not, then the cylinder itself must have a problem.
If the cylinder itself has an issue it should be covered under warranty. Car's got a 5/60 on the engine and drivetrain. I would take it into Subaru and have it diagnosed.
The warranty on the coil would likely be in the 1yr/12k mile coverage and not the powertrain warranty. If the cylinder has a problem internally then there is an issue with the engine and that would be covered by the 5/60 Do not tell them about the low octane fuel. They would use any excuse not to cover it for you.
That's where I would start, tell them check engine light and it's running rough. If they find a bad coil you will likely have to pay, if it's worse, like an engine problem it should be covered
Well, didn't see that coming.
Car was out of oil or something? Why are they not covering this under warranty?
Is it modded, I don't feel like I am getting the whole story and i am just being strung along here..
I would contact Subaru customer service and talk to them about it.
I would also take the car for a second opinion, even if it's a non dealer. This isnt adding up at all here.
Jst tell the second shop you have a check engine light and see what they say.
Subarus customer service # is 1-800-subaru3 and the price tag is just about right on
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