Quick Start?

[FirstTimeTruckOwner]

Hey all. I have a 23 AT4X and I've noticed lately that sometimes the truck starts very quick when pushing the start button. It's hard to explain, but sometimes when you push the start button, it starts normal, but then others it's like the truck turns over super quick.

Anyone else notice something similar with your truck?

 

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[True Bee]

Welcome to the forums
If this is a diesel maybe it's a temperature thing?

 

[FirstTimeTruckOwner]

Welcome to the forums
If this is a diesel maybe it's a temperature thing?

No it's the 6.2 gas engine.

 

[pinebaron]

Hey all. I have a 23 AT4X and I've noticed lately that sometimes the truck starts very quick when pushing the start button. It's hard to explain, but sometimes when you push the start button, it starts normal, but then others it's like the truck turns over super quick.

Anyone else notice something similar with your truck?

Is it during a first time or subsequent start on a day?

 

[True Bee]

Is it during a first time or subsequent start on a day?

Are you thinking fuel priming?

You get up about as early as I do, what is it barely even 0500hrs over there...

 

[pinebaron]

Are you thinking fuel priming?

You get up about as early as I do, what is it barely even 0500hrs over there...

Yes. I woke up at 03:55, shaved and was at my desk by 0407hrs and logged into my work/client network.

 

[FirstTimeTruckOwner]

Is it during a first time or subsequent start on a day?

Subsequent starts throughout the day. I only notice it once in a while and haven't been able to pinpoint when or how it happens.

 

[pinebaron]

Subsequent starts throughout the day. I only notice it once in a while and haven't been able to pinpoint when or how it happens.

That would explain it. Due to an earlier run or runs, with fuel rail still under pressure and depending on outside and engine temperature, relative humidity (low humidity will result in faster starts), enabling instant fuel injection/atomization and spark ignition, resulting in immediate engine start with minimal crank. Although crank position prior to crank start also plays a slight part in it, my explanation is more or less correct. Modern engines are built so much better.

 

[FirstTimeTruckOwner]

That would explain it. Due to an earlier run or runs, with fuel rail still under pressure and depending on outside and engine temperature, relative humidity (low humidity will result in faster starts), enabling instant fuel injection/atomization and spark ignition, resulting in immediate engine start with minimal crank. Although crank position prior to crank start also plays a slight part in it, my explaination is more or less correct. Modern engines are built so much better.

So essentially nothing to worry about?

 

[pinebaron]

So essentially nothing to worry about?

Exactly!

 

[True Bee]

That would explain it. Due to an earlier run or runs, with fuel rail still under pressure and depending on outside and engine temperature, relative humidity (low humidity will result in faster starts), enabling instant fuel injection/atomization and spark ignition, resulting in immediate engine start with minimal crank. Although crank position prior to crank start also plays a slight part in it, my explanation is more or less correct. Modern engines are built so much better.

And more simply stated
Fuel priming
Lol

 

[FirstTimeTruckOwner]

It's just so strange to hear the truck start so quickly. There's a very loud click noise right before it happens and it always catches me off guard. Obviously only happens once in a while, so it's definitely surprising.