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Old 10-16-2016, 10:35 PM   #1
Kkw22cal
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Default Rough Starting

I have been experiencing a problem with my 2012 WRX STi. The car currently has 39,700 miles on it. I bought the car new and have changed the oil at 3,000 mile incraments. Let me know if there is any other information needed about the car. Whenever I fill up my tank the car starts rough. I have to pump the gas peddle to keep the car from stalling out. What I find strange is any other time I start my car without getting gas, the car starts right up. I brought it to the dealership when the hard start disabled my cruise control and performance selection but this has occurred once, which is too much for me. They stated there were no codes other than a random misfire on cylinder three, which the tech stated was not a concerning code. They collected a sample of my gas from the injectors and was told that it was the correct volume and the gas looked good. I asked if it was the gas cap and I was told no. The dealership stated they spoke with the Subaru tech department and they stated that it was all in my mind. The dealership suggested that I use a different gas station. I have now filled my tank with 11 gallons of another brand of gas (still premium) with the same problem. Why does this only happen when I get gas? What systems do I need to be looking at?
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Old 10-16-2016, 10:47 PM   #2
Drew STi
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Sounds like a weird fuel pump issue. That's really the only thing I can think of that might be affected by the change in volume of the gas tank. Your not running the motor while you gas up ever right?
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Old 10-17-2016, 04:47 AM   #3
Kkw22cal
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I appreciate your reply as I am not sure where to turn. The dealership stated it could be how the gas was going into the tank and to wait some time before putting the gas cap back on. That does not fix the problem in my mind. They also suggested that the gas is old, but if that was the case the car would start poorly all the time. I don't run the car when the gas cap is off. I don't run it while I am filling up either. Is there a way to test the fuel pump? I drove it enough to replace 11 gallons this weekend. I will take it back to the dealer with a half of a tank which is about as low as I ever go before filling it again.
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Old 10-17-2016, 08:11 AM   #4
Drew STi
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Yes the dealer can check your fuel system. My thought is that you could have sedimentin the bottom of the tank getting stirred when you fill and temporarily clogging your fuel filter or some bad gas. Not sure if it can happen though. If I were you I would run the fuel down to 1/8 of a tank before filling and try a different gas station. You using 93 octane right?
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Old 10-17-2016, 09:15 AM   #5
Kkw22cal
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I only use premium gas in my car. I drive it on weekends and it sits outside all week. Would changing the filter resolve the problem? Though it is not what I normally do I will dive down to a quarter of a tank. I appreciate all of these ideas.
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Old 10-17-2016, 01:28 PM   #6
Samurai Jack
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Quote:
Originally Posted by Kkw22cal View Post
The dealership suggested that I use a different gas station. I have now filled my tank with 11 gallons of another brand of gas (still premium) with the same problem. Why does this only happen when I get gas? What systems do I need to be looking at?
Quote:
Originally Posted by DrewSTi
My thought is that you could have sedimentin the bottom of the tank getting stirred when you fill and temporarily clogging your fuel filter or some bad gas. Not sure if it can happen though.
Quote:
Originally Posted by Kkw22cal
I only use premium gas in my car.
Using only premium gas alone does not mean you can't get bad gas. Depending on how old the tanks are at any particular gas station, you can get water / sediment with the gas you are pumping into your car

It can definitely happen.

I think the fuel filter is only in the gas tank of your car. So you may not be able to change it unless you pull the fuel pump.

If the issue is water-based ( too much water in your tank ) you can use fuel injection cleaner which also contains additives to dry out the water.

YOu may have to experiment with different gas stations until you find one or more that work
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Old 10-17-2016, 01:50 PM   #7
Kkw22cal
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If it was water in the gas tank wouldn't the car idle bad all the time? I have been putting Techron into my gas every 3,000 miles. The dealer told me to stop doing this. I also asked about a dry gas additive but they stated that if there was water in the gas it would drive poorly all the time. I have an "open case" with Subaru and an appointment this Saturday. The tech will call them on Monday. My goal is to drive the gas out of the tank so there is 1/2 a tank or less on Saturday. I like the ideas that have been given and they stimulate conversation with the tech.
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Old 10-18-2016, 08:09 AM   #8
Samurai Jack
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Quote:
Originally Posted by Kkw22cal View Post
If it was water in the gas tank wouldn't the car idle bad all the time? I have been putting Techron into my gas every 3,000 miles. The dealer told me to stop doing this. I also asked about a dry gas additive but they stated that if there was water in the gas it would drive poorly all the time. I have an "open case" with Subaru and an appointment this Saturday. The tech will call them on Monday. My goal is to drive the gas out of the tank so there is 1/2 a tank or less on Saturday. I like the ideas that have been given and they stimulate conversation with the tech.
Not necessarily. Depends on how much water we are talking about.

You don't need to the additive every 3000 miles. That is just a marketing campaign by the manufacturer to get people to buy more when it is unnecessary so they make more money
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Old 10-18-2016, 09:14 AM   #9
Kkw22cal
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The dealership stated that the code for misfire on cylinder three came up again. I left the car with them so they could follow whatever directives the Subaru Technical Support Suggests. They are more concerned that the code was tripped again with only 400 miles since it was cleared.
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Old 10-18-2016, 09:20 AM   #10
Drew STi
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I would think the 2 were related. If your fuel tank has junk or water in it you would get a misfire because of the bad mix I would think . maybe I'm wrong though Not sure
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Old 10-19-2016, 02:21 PM   #11
Samurai Jack
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Quote:
Originally Posted by Drew STi View Post
I would think the 2 were related. If your fuel tank has junk or water in it you would get a misfire because of the bad mix I would think . maybe I'm wrong though Not sure
You are not wrong
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Old 10-19-2016, 04:20 PM   #12
Drew STi
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Thanks Samurai.
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Old 10-19-2016, 05:41 PM   #13
Kkw22cal
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I am still waiting for the dealership to get back to me about their next steps. The fact that they do not want to do anything without the blessing of the Subaru Tech Department is going to slow things down. I will report out once I hear something. I was hoping for a quick turnaround because I need to drive the car so that all the systems reset so I can go through inspection.
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Old 10-19-2016, 11:29 PM   #14
mbtech764
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Purge valve stuck open?
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Old 10-19-2016, 11:33 PM   #15
Davidbag001
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Sounds to me like it's a problem with your evap system possibly purge solenoid stuck open or charcoal canister is flooded with gas witch can happen if you over fill your tank. I have similar problem with my dodge truck every time I fill it up I drive 100ft or so and it will stumble and die no codes the part to fix it is $230 so i just live with it. Any way its just temporarily running supper rich causing it to stumble. Do you have an access port to data log the event?
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Old 10-22-2016, 10:52 PM   #16
Kkw22cal
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I was called by the dealership and the Subaru Tech Support wants to do a "draw down test", I might have heard that wrong, a compression test, as well as test the evaporation system. The Subaru Techs want to do the evaporation system test last but the mechanic does think that is the culprit. They should be doing them on Monday so I should have more information late that day. I am hoping that I get the car back by Friday so I can drive it on the weekend. I don't think I can live with this condition as the car really doesn't want to start after filling it up. The car went into a "safe mode" after one of the starts and I need to get the car inspected by the end of November. After this repair I am going to have to drive it several hundred miles for the all the programs to be ready. I appreciate everyone's input and will continue posting updates.
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Old 10-24-2016, 07:21 PM   #17
Kkw22cal
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Have a Nice Day?

The draw down test and the pressure test were completed and they came back fine. When the tech clamped off the hoses to the evaporation system the car started and ran well. When the clamps were taken off the car began to have trouble again. The tech states it is only the lower valve and not the upper valve. The fun is about to begin as I was told that the part is covered for three years/50,000 miles. I am good on the miles but not the years. I wouldn't have had the drawn down or pressure test until the evaporation system was completed if I was paying for it. My hope is that Subaru will good will it. They have good willed some parts in the past, one front and one rear caliper on my break job. I hope I have not used up my good will. They are saying the part installed is $260.00. I don't even want to know what they want for the diagnostic testing. All I want is my car back for the weekend so I can drive it.
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Old 10-25-2016, 09:05 PM   #18
Kkw22cal
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Have a Nice Day?

No good will on the part or instillation. The dealership stated they would not charge any diagnostic fees. I just want my car back so I can start driving it again. I need to drive it so that there are no codes that come back "not ready" so I can get the car inspected.
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Old 10-30-2016, 08:39 PM   #19
Kkw22cal
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Picked up the car yesterday after two valves on the evaporation system were replaced. I put around 200 miles on it filling it up twice. Both times the car started right up. Does anyone know how many miles and what kind of driving conditions I have to do to get all the systems in the computer ready? I really want to get rid of this failed inspection sticker. The wing is enough, I don't need another reason for the police to look for me. I don't drive the car to work because of where I work but I would take it out each night to put more miles on it. My hope, however misguided, is to get it inspected next Saturday.
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Old 10-31-2016, 10:02 PM   #20
Drew STi
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If it's fixed it's fixed. Learning happens constantly on the factory ecu. Everythi g should be pretty well adjusted after a hundred miles of different throttle positions and what not.
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Old 11-06-2016, 07:21 PM   #21
Kkw22cal
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All the systems were running and no codes on Thursday when the dealer checked them. Took the car through inspection on Saturday and now have a new inspection sticker, good until December 2018.
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Old 11-07-2016, 11:27 AM   #22
Onyxyth
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This sounded exactly like an EVAP problem - glad they figured it out. I wouldn't expect anymore problems.
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