2015 Yukon hesitates starting first time in the morning

kakelusa · Jan 9, 2023

Hi there, My 2015 Yukon hesitates to start first time in the morning ( 3 or 4 cranks ), once is warm it will start the first time.
I have replaced the spark plugs, replace Air filter, clean the throttle body, any ideas?

Thanks

B-train · Jan 9, 2023

Sounds like a fuel delivery issue. Do you hear the pump cycle when you open the driver door after it sits all night? I'm speculating that you're losing volume after it cools and sits, which then needs to be replaced when the initial key crank is commanded. How's the oil smell? Any smell of gasoline?

kakelusa · Jan 9, 2023

I dont smell any gas outside the car but I check the oil next.

Thanks for the info

markni12301 · Jan 9, 2023

B-train said:
Sounds like a fuel delivery issue. Do you hear the pump cycle when you open the driver door after it sits all night? I'm speculating that you're losing volume after it cools and sits, which then needs to be replaced when the initial key crank is commanded. How's the oil smell? Any smell of gasoline?

Just curious, should we normally expect to hear the pump cycle when the driver door is open after sitting all night?

B-train · Jan 10, 2023

Yes. I'm not sure what the time delay is, but it's a normal feature on all the new direct injected LT motors I believe.

mrathell · Jan 10, 2023

Have you replaced your fuel filter and regularly put fuel injector cleaner in your gas?

avalonandl · Jan 10, 2023

Direct Inject engines need to crank for a a couple seconds for HP pump to get fuel to injrctors when first starting. Your vehicle is losing its prime.

2015 Yukon hesitates starting first time in the morning

kakelusa

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B-train

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kakelusa

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markni12301

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B-train

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mrathell

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avalonandl

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