RPM fluctuation.....

[Tcoat]

Originally Posted by Astral Abyss

I have a brand new 2016 that started doing this today. 280 miles on it. Drove it into work on the interstate for 22 miles, AC on. Pulled into my parking garage downtown, no issues, but when I parked and turned off the AC, it started dropping down to 400rpm, started to stall, jumped up to 1100rpm, slowly started to fall all the way to 400 again, and back up to 1100. It did this about 5-6 times before I turned off the car.

To me at least, it seems like an ECU programming/learning issue. I bet if I pulled the battery for 15 minutes and reconnected it that it would be fine for a while. My 2014 Mustang would do the same thing, but only occasionally and never this bad.

At 280 miles your ECU hasn't completely learned yet. Give it some time and I bet it clears up.

[Astral Abyss]

Originally Posted by Tcoat

At 280 miles your ECU hasn't completely learned yet. Give it some time and I bet it clears up.

I'm hopeful that's all it is. I'll let the car idle for a few minutes with the AC off before I head home today.

[Tcoat]

Originally Posted by Astral Abyss

I'm hopeful that's all it is. I'll let the car idle for a few minutes with the AC off before I head home today.

If it doesn't level out then take er in. Not a common issue but still pops up every once in a while.

[cdo221]

This happens to my 2015 RS 1.0 still after 6000 miles. I've pulled the battery a few times, to try to get it to relearn. It doesn't happen often, maybe like once a month I notice it.

[Scavanger]

so I have a 13 10 series frs just had the motor replaced and im having this issue now (didn't have it with the old motor) RPMs will go between 550ish to 1000 and It threw a CEL for codes P015A P015B P119E and P219A talked to the dealership and they don't know what the issue is any help. Also I checked my AFRs and they go from 11 ( where it hits 550 RPMs) to 20.4 (1000 RPMs). Any help? Tuned with a custom ECU tune for intake manifold, intake, and full exhaust. (I did have to put back on my stock headers since the last ones cracked yay shitty welds)

[Tcoat]

Originally Posted by Scavanger

so I have a 13 10 series frs just had the motor replaced and im having this issue now (didn't have it with the old motor) RPMs will go between 550ish to 1000 and It threw a CEL for codes P015A P015B P119E and P219A talked to the dealership and they don't know what the issue is any help. Also I checked my AFRs and they go from 11 ( where it hits 550 RPMs) to 20.4 (1000 RPMs). Any help? Tuned with a custom ECU tune for intake manifold, intake, and full exhaust. (I did have to put back on my stock headers since the last ones cracked yay shitty welds)

Have you tried going back to a stock tune to see if the problem resolves?

[Scavanger]

I went back to the stock tune and it went away for a little while but that's like a few hours. Now it feels like it is jumpy going up through the rpms and is staying around 20.4 for the AFR as im on it. Also when in neutral going down the road it still fluctuates between 500 and 900 and it hit 489 rpms and almost stalled. Think it might be a legit issue at this point.

[Astral Abyss]

I've discovered that mine only does it when I'm in Park (automatic). As soon as I put it into Reverse or Drive, the fluctuation issue stops. Engine RPM doesn't fluctuate all the time, but it really likes to do it after I've been driving a while and put it into Park. A/C on or off makes no difference. I'm at 950 miles on the odometer now.

[Premium 615]

In for updates...

I just had the pulsing RPMs happen to me this morning while picking up prescriptions. I was like wtf is going on. I'm not sure where the BRZ stalls at but the 500-490 range seems like it was imminent.

I drive a 2015 BRZ with the automatic just to clarify.

[cdo221]

Originally Posted by AKUSHOU

In for updates...

I just had the pulsing RPMs happen to me this morning while picking up prescriptions. I was like wtf is going on. I'm not sure where the BRZ stalls at but the 500-490 range seems like it was imminent.

I drive a 2015 BRZ with the automatic just to clarify.

Were you in drive or in park?

[Premium 615]

Originally Posted by cdo221

Were you in drive or in park?

The car was in park at the time.

[Newtothegrounds]

I'm running into the same issue 2016 frs have had it for a bit over a week and over 1000km on it when I sit parked the rpms will drop down too 500 than shoot up to a 1000 and back and forth, a lot of times when it dips it shakes the car.

[steve99]

Originally Posted by Scavanger

so I have a 13 10 series frs just had the motor replaced and im having this issue now (didn't have it with the old motor) RPMs will go between 550ish to 1000 and It threw a CEL for codes P015A P015B P119E and P219A talked to the dealership and they don't know what the issue is any help. Also I checked my AFRs and they go from 11 ( where it hits 550 RPMs) to 20.4 (1000 RPMs). Any help? Tuned with a custom ECU tune for intake manifold, intake, and full exhaust. (I did have to put back on my stock headers since the last ones cracked yay shitty welds)

Those codes are afr imballance and o2 sensor slow respomse.

possible stuffed 02 sensor cracked damaged leaking at seal not in bung all the way ect or its been contaminated with grease\oil ect.

might also be exhaust air leak did you use new gaskets ?

ive seen those caused also when poeple mistakenly put o2 spacer on the front o2sensor instead of rear one or they plug the wrong sensors in , should be black plug to black socket grey to grey, also one exhaust shop did not even plug sensors back in :-)

[steve99]

Originally Posted by Newtothegrounds

I'm running into the same issue 2016 frs have had it for a bit over a week and over 1000km on it when I sit parked the rpms will drop down too 500 than shoot up to a 1000 and back and forth, a lot of times when it dips it shakes the car.

are you on good fuel ?
if fuel is ok take it to dealer, maybe video issue to show them if its intermittent.