Check engine light just came on after 2k miles.

[Oriental Life]

Guys, relax. OP is in SoCal, which means 91 octaine fuel. We simply don't get higher 93 octain in Cali.

The fact that engine shook and RPM dropped prior to the light appeared, lead me to believe that its a detonation. Why? DI + port injection switching.

Give both companies some time to gather more cases and stats. Demo cars had 10K + miles on them during some reviews we read back April. I'm sure it would come up if it was THAT big of a deal.

Take notes and bring those to your dealers. Meanwhile get gas only from reputable gas stations.

[eriktherod]

While that may be a contributing factor, it shouldn't start throwing CELs from 91 vs 93. Even the lowest grade fuel should 'work' but just not optimally. This is a 2013 car, I doubt it's that sensitive to fuel grade to the point it starts having idling issues and throwing codes.

Also, to Toyota's credit, they've beat Subaru in reliability for the last decade on both year-old and 10-year old cars.

[Oriental Life]

We don't know anything about OP fuel. Numbers written on the wall are nothing. Deponation could trigger CEL and its a nasty one to figure out via codes - they are all over the board.

[carbonBLUE]

Originally Posted by Oriental Life

Oh, now you remembered that its a Subaru! :-) How about the fact that issue may lay in the ONLY part that Toyota provided - DI. :-)

You guys make me smile:happy0180:

actually the valve timing was left to toyota because of D4S
toyota was in charge of
1. money
2. exterior
3. D4S( injection)
4. the Diff
5. transmission(both manual and automatic)
6. intake
7. keyless
8. power steering(its actually tech trickled down from the LFA!!)
9. interior design
10. electronics(buttons, ergonomics of the cabin)
11. areo dynamics
12. exhaust tuning/development
13. all the glass window( thicknesses, auto up down, uv protection)
14. airbags
15. frame design(types of metals used/crash testing)

subaru
1. suspension
2. engine donor
3. chassis
4. homelink
5. driveshafts
6. brakes
7. wheels
8. making the car
9. carpets
10. Frame design (ring shaped designed)

[Hawaiian]

Originally Posted by Oriental Life

Oh, now you remembered that its a Subaru! :-) How about the fact that issue may lay in the ONLY part that Toyota provided - DI. :-)

You guys make me smile:happy0180:

Cam sensors/alignment/engine internals (sans DI) are from Subaru, not Toyota. Don't try to be a fanboi and pin things on the other "parent". The twins belong to both companies and the most important thing is they work together to settle the issues quickly and efficiently.

[dirk_diggler]

Originally Posted by the_3d_man

Dealerships are always so quick to say that the ECU must be defective. I've NEVER seen a car with a bad ECU. They don't just fail but I know so many people who in the process of trying to diagnose a problem have had the dealership replace the ECU. It's just the answer that dumb service techs like to give.

ECUs can and do fail, especially if they are exposed to the heat and NVH of the engine bay. Sometimes it's a design fault, like the 90's Jeep Grand Cherokee ECU. These cars also had really bad main harnesses. A harness in good shape goes for $400+. Ask me how I know.

The JGC had all of the above going for it.

[eriktherod]

When you mention a Chrysler from that era, it says it all to me. My dad had one of those Chrysler vans from that same time period, eugh..

[Pscylo]

I've put over 3500 miles on my FR-S, driven all over the southwest....giving her all the chances I could to break on me.

[w arghh x]

Originally Posted by Oriental Life

Guys, relax. OP is in SoCal, which means 91 octaine fuel. We simply don't get higher 93 octain in Cali.

The fact that engine shook and RPM dropped prior to the light appeared, lead me to believe that its a detonation. Why? DI + port injection switching.

Give both companies some time to gather more cases and stats. Demo cars had 10K + miles on them during some reviews we read back April. I'm sure it would come up if it was THAT big of a deal.

Take notes and bring those to your dealers. Meanwhile get gas only from reputable gas stations.

Its interesting because here in Aus we are told to run 98octane (95 at a minimum) and in Japan I'm fairly certain their fuels are 100octane.

I wonder if there is a difference between quality of US vs AUS/JPN fuels or if the US market cars have been de-tuned to suit etc..

[eriktherod]

I believe the fuel trims (ECU maps) are different for each region.

I remember when I would reflash the ECU on my Si, the Hondata stock maps for various regions were different and even some of the ECUs themselves were different.

[Oriental Life]

Originally Posted by Hawaiian

Cam sensors/alignment/engine internals (sans DI) are from Subaru, not Toyota. Don't try to be a fanboi and pin things on the other "parent". The twins belong to both companies and the most important thing is they work together to settle the issues quickly and efficiently.

:happy0180: Read my sarcasm between the lines! Peace!

[Oriental Life]

Originally Posted by w arghh x

Its interesting because here in Aus we are told to run 98octane (95 at a minimum) and in Japan I'm fairly certain their fuels are 100octane.

I wonder if there is a difference between quality of US vs AUS/JPN fuels or if the US market cars have been de-tuned to suit etc..

There is a differense. US 91 come as 95 EU. This car needs 98 EU. I guess its the same for you as well. Need tl look it up, but not in the mood.

[Bonburner]

The octane discussion is entertaining but it doesn't address the problem.
It says in the manual that 91 will do the job fine - most likely the ECU has been tuned to it then.

[BlaineWasHere]

Originally Posted by Oriental Life

Meanwhile get gas only from reputable gas stations.

I never had this problem when I lived in MI, but out here in CA I find if I stray from Shell or Chevron you can get bad fuel. Stations like Rotten Robbie and other cheaper stations would throw CEL in my GTI, which is a DI motor.