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Rich cold start

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Old Dec 12, 2023 | 03:17 PM
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Default Rich cold start
I was recording a cold start video and noticed a puff of black smoke. It's definitely fuel. I assume this is normal?

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Old Dec 12, 2023 | 03:59 PM
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Mine doesn't do that. I'm sure others will chime in.

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Old Dec 12, 2023 | 04:07 PM
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It's normal for the fuel injection to be commanded rich on cold start. The extra fuel makes the catalytic converters heat up to operating temperature faster. I haven't watched mine from behind the car on a cold start, though, so I'm not sure about smoke. I haven't noticed it in the rear view mirror.
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Old Dec 12, 2023 | 04:12 PM
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Yes, normal. As mentioned, burns rich on start-up to heat up the cats.
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Old Dec 12, 2023 | 07:03 PM
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I haven't viewed my car from the rear on a cold start but I know the noise is MUCH louder than any start after that during the same travel.
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Old Dec 12, 2023 | 07:22 PM
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Smoke was minimal, so definitely normal IMO. A cold engine requires a much richer mixture to start.
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Old Dec 12, 2023 | 08:18 PM
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Normal. My 2020 does the same.
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Old Dec 12, 2023 | 08:46 PM
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Originally Posted by sTz
Yes, normal. As mentioned, burns rich on start-up to heat up the cats.
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Old Dec 13, 2023 | 11:15 AM
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Old Dec 13, 2023 | 11:33 AM
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There's no problem.
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