My 2016 Scion iA idles rough when ...... - Page 2 - Scion IA Forum
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post #11 of 16 (permalink) Old 03-23-2018, 07:39 PM
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I was having a rough idle as well. Plugged my obd2 reader in and reset all the sensors and whatnot and after the ECU relearned O2 sensor, fuel trim etc it idles like new. It's not rough or shaky.
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post #12 of 16 (permalink) Old 03-30-2018, 11:46 PM
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What did you disconnect the battery for 5 mins and reconnect
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post #13 of 16 (permalink) Old 04-05-2019, 02:04 PM
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Disconnect the battery for 10 mins or so reconnect it go for a long drive on the freeway 30 mins+ then when you get off the freeway do some city driving and keep it in drive at all the lights it will vibrate for a second at the first couple lights then it stops completely this fixed the problem for me.
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post #14 of 16 (permalink) Old 04-21-2019, 02:46 PM
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My vibration came back the harmonic balancer looks fine motor/tranny mounts look fine air filters are new and theres no stored codes but I've come to find out that it's normal for 4 cylinder engines to vibrate at low rpm so I'm not going to worry about it unless it gets worse or a code pops up.
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post #15 of 16 (permalink) Old 03-17-2020, 01:35 AM
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Unhappy Still rough idle a 100k.

Idling rough and getting worse at 100k. New coils plugs and cleaned MAF to no avail. when A/C is on idles 700 and is smoother but still rough. Idles 500 and rough with no A/C. Any suggestions as to how I can sell this thing?
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post #16 of 16 (permalink) Old 04-20-2020, 07:01 PM
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Hello, my 2017 iA (38k miles) started idling rough only after doing highway driving then coming to a stop. Now it idles rough doing round town driving. Dealer said...if check engine light isn't on they want $185 just to look at it even tho I have the platinum extended warranty...When it drops to 500 rpm when breaking, i pop it in neutral and the rpms come right back. It is annoying but i dont think its causing any damage.
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