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Old 10-16-2018, 08:40 PM   #1
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The hell did the dealership do?

I took my FR-S into the local Toyota dealership for a 27k service (the last service on my ToyotaCare deal). Just wanted an oil change and a fluid check before the big 30k comes around. They also suggested a mass air sensor cleaning (?) and a de-carboning of the engine intake area (hmm...)

They also suggested a brake fluid flushing which I turned down, since I was going to install braided brake lines soon in the future.

When I got the car back, everything seemed okay. While I was driving, I noticed that when I came to a stop, if I pushed in the clutch with the shifter still in gear, the engine would slowly rev up to 2000 rpm, then slowly reduce to idle at 500. If I pushed the clutch in and put the shifter in neutral, the revs would simply go to idle without the odd climbing.

At first I thought it was something to do with the mass air sensor cleaning, but now I'm thinking they did some kind of software update to combat the famous "low idle" issue these 2013 models had. There's nothing in the receipt about a software update but maybe it was a Service Bulletin kind of thing. It almost seems like some kind of "rev match" feature.

I'm going to call the dealership to ask what the deal is, but I thought I'd ask here first. Any info would help.

Needless to say that's my last trip to the dealership for service, now that the ToyotaCare deal is over.
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Old 10-16-2018, 09:51 PM   #2
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I doubt anything happened. I've always noticed my car revving/idling a little funny after every dealer visit but after a bit of a drive it goes back to normal. Always thought it was due to maybe the dealer disconnecting the battery and the ECU having to relearn..got a video clip? 2 k RPMs is a big jump..
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Old 10-16-2018, 09:52 PM   #3
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I will make one.


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Old 10-16-2018, 10:25 PM   #4
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don't know about your specific situation. But I would unplug the battery then let the car idle for about 5 mins before touching the gas pedal
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Old 10-16-2018, 11:26 PM   #5
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I took my FR-S into the local Toyota dealership for a 27k service .
Oh, I wouldn't worry about it. The car is just giving you a sigh of relief that they didn't mess it up -

If they messed with the MAF, your car's ECU is most likely just adjusting. I'd suggest you give it a couple hundred miles to settle down.




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Old 10-17-2018, 12:05 AM   #6
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don't know about your specific situation. But I would unplug the battery then let the car idle for about 5 mins before touching the gas pedal

I agree with Tom, If they cleaned the maf sensor, I'd pull the battery lead. Fyi, when you do this it resets the ecu including the throttle position learning.. it will feel like dead peddle, this is normal, it'll fix itself.
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Old 10-17-2018, 12:45 AM   #7
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imo next time if it aint broke dont fix it. maybe they used too much cleaner and it needs to burn off/dry off.
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Old 10-17-2018, 09:26 AM   #8
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It is the MAF cleaner. Well documented symptoms. Also totally unrequired. Same as the "de-carboning of the engine intake". If you have carbon build up in your intake you have bigger issues!
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Old 10-17-2018, 12:56 PM   #9
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I took my FR-S into the local Toyota dealership for a 27k service (the last service on my ToyotaCare deal). Just wanted an oil change and a fluid check before the big 30k comes around. They also suggested a mass air sensor cleaning (?) and a de-carboning of the engine intake area (hmm...)
I'd suggest you check the maintenance guide that came with your car. For my 2013 FR-S, the 30,000 mile maintenance is no big things.

But, your dealership may try to make big things out of it .


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Old 10-17-2018, 01:34 PM   #10
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... and a de-carboning of the engine intake area...
Why did they do this? The FA20 in the FR-S/BRZ/86 doesn't have carbon build up issues like other Subaru direct injected engines, such as the FA20 in the 2015+ WRX. Our engines have port injection along with direct injection, which helps keep the intake ports and intake valves clean, so "de-carboning" shouldn't be necessary.
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Old 10-17-2018, 01:50 PM   #11
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Why did they do this? The FA20 in the FR-S/BRZ/86 doesn't have carbon build up issues like other Subaru direct injected engines, such as the FA20 in the 2015+ WRX. Our engines have port injection along with direct injection, which helps keep the intake ports and intake valves clean, so "de-carboning" shouldn't be necessary.
Not to mention that no mater what injection system they use there should be no combustion nor carbon build up in the intake.
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Old 10-17-2018, 02:47 PM   #12
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All good points. Just goes to prove that dealerships RARELY suggest things that are actually needed for specific cars.
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Old 10-17-2018, 03:26 PM   #13
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All good points. Just goes to prove that dealerships RARELY suggest things that are actually needed for specific cars.
Just proves THAT dealership does. Not all are like that.
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Old 10-17-2018, 04:06 PM   #14
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Not to mention that no mater what injection system they use there should be no combustion nor carbon build up in the intake.
There shouldn't be, but on directed injected engines it's pretty tough to avoid unless you delete the EGR (if it has an external EGR valve and isn't done through camshaft timing like our engine) and install an air oil separator. The build up on the intake ports/valves in my friend's WRX wasn't exactly carbon. It was more of a thick, black, oily goop.
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