Car feels a little less peppy
 

I have a 2013 FRS AT and it seems a bit less peppy currently. It has 31k miles on it and does get regular oil changes and maintenance. Also there are no codes showing any problems when I do a scan. What could be causing this? Everything is stock and I only use 93 octane gas also.

has it been less peppy for a prolonged period or just in the last day or two? I know sometimes in certain weather conditions my car feels a tad slower as well due to the timing changes. How is the intake filter looking?

I need to check the filter. Its been less peppy for about 4 days now.

There is so much construction going on where I live and where I work. Maybe the filter needs a cleaning.

I'm also in Florida, really peppy in the morning but not so much on the way home. The temperatures around here have been swinging wildly from morning to afternoon. Seems to have a big impact on this car.

Yeah the car was running great with that cooler weather we had for a while.

So, not to hijack this thread, but it's sort of related... I recently read in GRM a recommendation from a well established Subaru tuning house that they suggest walnut media blasting to remove carbon buildup from the FA20 intake valves in WRXs every 30K miles (!). Since common symptoms of carbon buildup are lower power, poor idle quality, etc, I wonder how much truth there is to this, and how applicable this would be for us...?

They say the port injectors help out with carbon buildup normally associated with DI. But it may still be helpful.

Less applicable to us, as we have port injection as well as direct. The main reason for the carbon build up is that the WRX is DI only, so there is no washing for the intake valves with fuel.

Yeah, and because of this, I try to drive somewhat frequently in a manner which uses the port injectors, and use the best quality fuel (high detergents) I can find. However, the 30K mile recommendation still surprised me quite a bit... Would we double that for our cars versus the DIT motors? Triple it? Or maybe only half again as much? Or is it enough bullshit to not worry about it? Dunno...this is my first DI car.

Clean maf sensor?

High heat/humidity really effect these cars.

It is possible I got used to the cooler weather we experienced. I can not remember such a long cold spell in Florida my 40 years living here. Not that is was to cold but in the low 50's in the morning in Fort Lauderdale for about 1 month at least. Now that it started the summer rains and warmed back up it might be the cause of this.

This ^
No cars like hot, humid weather and these are not immune to it. Since they rely on high compression for power they can even be a bit more susceptible to it.