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Cold start after sitting all night

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Old 09-18-2023
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Cold start after sitting all night
Slight hesitation with rumble first start in AM after sitting all night in 70 degree weather.After the first start and drive it starts immediately for rest of day.Any ideas?
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Old 09-18-2023
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Re: Cold start after sitting all night
Any faults?
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Old 09-19-2023
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Re: Cold start after sitting all night
No faults/codes
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Old 09-19-2023
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Re: Cold start after sitting all night
Possibly coolant leaking into a cylinder overnight from faulty head gasket?
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Old 09-19-2023
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Re: Cold start after sitting all night
Coolant level has stayed normal
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Old 09-19-2023
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Re: Cold start after sitting all night
Primary o2 sensor could be on the way out, or maybe coolant temp
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Old 09-20-2023
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Re: Cold start after sitting all night
Should have mentioned car only has 50,000 miles on it but maybe I'll multimeter test the sensors in any case.Thanks
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Old 10-05-2023
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Re: Cold start after sitting all night
Do you think a fuel pump check valve going bad could cause this?
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Old 10-05-2023
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Re: Cold start after sitting all night
No. I think a faulty check valve would only cause extended cranking before starting.
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Old 10-06-2023
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Re: Cold start after sitting all night
OK Thanks for your input
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