Won’t start when colder than 25 degrees

[02_Tahoe]

My truck has a hard time starting below 25, but usually around 20. I’ll crank it, and nothing. Crank again push the pedal down then sometimes it will fire up. But this morning I️ must have cranked it 10-15 times before it even started, and when it does start it sounds like I️ have a big cam in there, almost like it’s misfiring but it’s not a rhythm so it’s not the same cylinder. Anyone have this problem? I’m going to the gas station today and throwing a bottle of HEET in there to see what that does

 

[PG01]

Is it cranking slow? As if battery is low?

 

[swathdiver]

My truck has a hard time starting below 25...

So do I, that's cold!

What kind of fuel are you using?

 

[Tkrysl]

Following. This curious the expert advice...

 

[02_Tahoe]

Is it cranking slow? As if battery is low?

No cranks fine, battery isn’t even 2 years old

 

[02_Tahoe]

So do I, that's cold!

What kind of fuel are you using?

What do you mean, like what octane? 87 if that’s what you mean

 

[Fless]

Ethanol (E85, Flex Fuel)?
E10?
Ethanol-Free?

 

[swathdiver]

What do you mean, like what octane? 87 if that’s what you mean

Bingo! Get rid of that stuff for 93. You'll get better mileage anyways.

 

[CamReynolds]

spark plugs look ok?

 

[rockola1971]

Bingo! Get rid of that stuff for 93. You'll get better mileage anyways.

Raising the BS flag. Our engines were designed to run just fine on 87 octane regular unleaded. Because 87 has 10% or so ethanol in it and 93 has zero in it then it will get slightly higher gas mileage but most likely not enough to warrant the extra cost per tank of 93 octane over 87 octane. We are talking maybe 20-30 miles more per tank. But it would still boil down to it would be cheaper to drive one mile with 87 vs. 93 octane.

The intake gaskets are most likely leaking in unmetered air into the intake stream. Gets harder to start the colder it gets outside and runs like crap until the engine warms up and gasket leak seals up enough to slow down the intake of unmetered air.

And you have the stereotypical symptoms of a long known problem of the intake gaskets leaking.