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Tachometer needle sporadic when starting. Is this normal?

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Old Feb 15, 2024 | 07:12 AM
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Default Tachometer needle sporadic when starting. Is this normal?
Just got my 2020 Lexus ES 350 literally a few days ago and noticed the tachometer doing this odd dance every time I start the car. Never seen this before in any other car, took it to Lexus yesterday and they said it's "normal", but I don't think it is. The car only has 24k miles, clean, no accidents reported, good service history.

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Old Feb 15, 2024 | 07:19 AM
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I've never noticed but, and maybe a more smarter person can answer this, isn't it normal for the tach to do that dance on cold start? I know it revs a bit higher on cold start while it gets things warmed up, and it's like it's figuring out the optimal rpms to achieve this or something?
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Old Feb 15, 2024 | 08:50 AM
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It's an engine, so I imagine it's normal for the engine to do engine things as it warms up, meters air, makes adjustments on the fly. It doesn't look out of the ordinary to me. Maybe Mike can start his up and show us his 300 ponies in action.
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Old Feb 15, 2024 | 09:30 AM
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Not normal.
I would clean the butterfly valve and reset the idle control.
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Old Feb 15, 2024 | 10:37 AM
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Originally Posted by E46CT
It's an engine, so I imagine it's normal for the engine to do engine things as it warms up, meters air, makes adjustments on the fly. It doesn't look out of the ordinary to me. Maybe Mike can start his up and show us his 300 ponies in action.
I don't watch it much but on cold start up I'm certain it doesn't stay perfectly still for a few moments.
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Old Feb 16, 2024 | 06:14 AM
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I watched this morning when I started the car. My tach did the same exact thing. I'm going with this is perfectly normal on a cold start
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Old Feb 16, 2024 | 09:07 AM
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turn the HVAC off and it should stabilize it. I have that in my 2016 RX350. same engine
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Old Feb 16, 2024 | 06:17 PM
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Originally Posted by F3Woody
I watched this morning when I started the car. My tach did the same exact thing. I'm going with this is perfectly normal on a cold start
I agree - mine does this as well.
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Old Feb 16, 2024 | 06:21 PM
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Originally Posted by toyotaman7
turn the HVAC off and it should stabilize it. I have that in my 2016 RX350. same engine
So I tried this today and it did the same thing.
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Old Feb 17, 2024 | 06:14 PM
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Originally Posted by Quentin718
So I tried this today and it did the same thing.
enjoy the car and don't worry about it.
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