Vibration - Scion IA Forum
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post #1 of 4 (permalink) Old 03-30-2019, 04:42 AM Thread Starter
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My car vibrates at a stop in drive or reverse after I have been driving 30+ mins, goes away if I turn ac on (raising rpm by a couple hundred) rpm still stays stable while vibration occurs, everything else seems fine. Has anyone who's had this found a fix? My theory is maybe the idle rpm was set low at the factory to save gas and they estimated a bit too low and then when the tcm does it's "learning process" if you happen to take mostly shorter dives not ever getting the engine up to its most efficient temp then when it actually does the idle drops accordingly and causes the vibration, or at least thats what I'm hoping.. Gunna unplug the battery for a while tomorrow and hope it can relearn my driving and fix it.. It has powertrain warranty but I don't want them to do just enough to limp me past the warranty and leave me screwed if it is torque converter or transmission related. I want to know as much as possible before I go in so that I dont get taken advantage of.

Last edited by Cole; 03-30-2019 at 04:47 AM.
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post #2 of 4 (permalink) Old 03-31-2019, 12:04 AM
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Yes mine does too when it is fully warmed up in warmer weather.
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post #3 of 4 (permalink) Old 04-02-2019, 07:09 PM Thread Starter
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This seems to have fixed the issue I'll post an update if the vibration comes back.
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post #4 of 4 (permalink) Old 04-21-2019, 02:49 PM Thread Starter
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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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