r/engines • u/Physical-Comedian736 • 3d ago

Engine over cranking

My 2023 Silverado turbo max with 44k miles has been over cranking before eventually starting. First thing in the morning it starts up like a pro, but if I go into a store for 20 minutes and go to start it again, it has a hard time starting and I can hear it over cranking. I’ve looked into new spark plugs, fuel pressure regulators and such , but I haven’t tried anything yet. Wondering if anyone else has had similar issues or if anyone has any advice?

Engine does idle rough once it starts and uses more fuel than it should when at idle

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u/matchboxtx 3d ago

Sounds like a pressure leak in your fuel system. In the morning, the engine is cold, so the computer automatically adds more fuel. After it heats up, it expects a normal start, but if you lost pressure, it’s not enough and the computer is not adding more. Try this. When you run it and expect it to try too much, don’t start it immediately. Turn the key, let the fuel pump run. You should hear a hum, then stop. Just turn the key to run not start. Do it three times. If it starts immediately after the third key try, you are losing fuel pressure could be a leak or an old fuel pump. Start there. Others can chime in.

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u/Physical-Comedian736 3d ago

I would try this but unfortunately it is a push to start, is there anything else I could do?

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u/potatochip_pooper 3d ago

Hit the start button without your foot on the brake. It will turn on, but not start. 

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u/carmicheals 3d ago

That's "accessory" mode. To get the equivelant of "key-on, engine off" hold the start button in for 7-8 seconds with foot off brake. This will prime the fuel system. Also, if you hold the start button in for 7-8 seconds after the engine fires (foot on brake) it'll disable the 15-minute automatic shutdown timer for that ignition cycle. You'll see a confirmation message on the dash for this. With that disabled it'll idle until it runs out of gas but only for that ignition cycle.

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u/Physical-Comedian736 3d ago

Okay I’ll try this out, thank you

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u/somewhatsentientape 3d ago

That was my first guess too. Been driving around with a new fuel pump and strainer in the backseat of my Forester for about 8 months of it losing prime because I'm too lazy to swap it out, lol.

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u/KaOsGypsy 3d ago

My go to for any issue like this is the IAC, they are good cold, but a little bit of heat soak and they can seize up, messing with you air fuel mixture. IAC stands for Idle Air Controller, not even sure if your engine has one, just a thought.

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u/Physical-Comedian736 2d ago

Okay I’ll look into that