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Hard start

J-man67

By J-man67
in Engines & Drivetrain

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J-man67 Senior Enthusiast

J-man67

Posted
Posted

Just got the truck 3 weeks ago. Comparing to my 07 5.3, this motor turns over for a while before starting. Video captured wasn't an overnight soak, but it turns over a few times. Is this normal with the DI. That's the only difference. My 07 turned over instantly every day no matter the temp.

 

 

http://s32.photobucket.com/user/J-man67/media/20150216_175837.mp4.html

txchevy4ever Enthusiast

txchevy4ever

Posted
Posted

Just got the truck 3 weeks ago. Comparing to my 07 5.3, this motor turns over for a while before starting. Video captured wasn't an overnight soak, but it turns over a few times. Is this normal with the DI. That's the only difference. My 07 turned over instantly every day no matter the temp.

 

 

http://s32.photobucket.com/user/J-man67/media/20150216_175837.mp4.html

Direct injection varies how long the crank is depending on temperature.

txchevy4ever Enthusiast

txchevy4ever

Posted
Posted

Thanks! Feel a little better

No problem, in fact, I think somewhere in the manual or online there is a chart showing the relationship between crank seconds and temperature...

gone_fishing Enthusiast

gone_fishing

Posted
Posted

Really? I'll take a look. Thanks again man

 

Check out this post for more info: http://www.gm-trucks.com/forums/topic/165728-first-start-up-in-the-morning/?p=1517802

 

From what I saw in the video, yours looks normal. I've had my crank for a good 5 seconds if left outside in sub zero temps.

 

FYI you don't have to hold the key forward when starting. You can turn it till you engage the starter then let go (it will continue cranking till it starts).

J-man67 Senior Enthusiast

J-man67

Posted
  • Author
Posted

Thanks a lot guys. I was slightly worried. Just comparing it to my last 5.3. It always starts, but over-night temps in single digits, cranks. Now that I know it's normal, I won't worry about it.

gone_fishing Enthusiast

gone_fishing

Posted
Posted

Thanks a lot guys. I was slightly worried. Just comparing it to my last 5.3. It always starts, but over-night temps in single digits, cranks. Now that I know it's normal, I won't worry about it.

 

I've read that other DI motors do this also. Just the nature of the technology.

J-man67 Senior Enthusiast

J-man67

Posted
  • Author
Posted

Yeah I want to learn more about it now. Usually on top of this stuff...busy busy these days.

scott19677 Senior Enthusiast

scott19677

Posted
Posted

Just got the truck 3 weeks ago. Comparing to my 07 5.3, this motor turns over for a while before starting. Video captured wasn't an overnight soak, but it turns over a few times. Is this normal with the DI. That's the only difference. My 07 turned over instantly every day no matter the temp.

 

 

http://s32.photobucket.com/user/J-man67/media/20150216_175837.mp4.html

E85 takes an eternity.lol But for the extra power its worth it. Also much better drivability.

J-man67 Senior Enthusiast

J-man67

Posted
  • Author
Posted

Nice. Found an e85 station near me. Going to try it when it warms up. Heard not so good in extreme cold. Single digits here at night.

patriot Enthusiast

patriot

Posted
Posted

The biggest help for a fast start on my '02 was installing an Optima battery. It'd start FAST then. High current reserve is your friend.

scott19677 Senior Enthusiast

scott19677

Posted
Posted

Nice. Found an e85 station near me. Going to try it when it warms up. Heard not so good in extreme cold. Single digits here at night.

Yeah, I just switched back over to 93. I would wait till warmer weather then run a few full tanks of E85. Driving in M5 on E85 feels like a different truck. And if your feeling a little spunky go ahead and hit the TOW HAUL button lol. Its like having a looser stall converter :driving:

txchevy4ever Enthusiast

txchevy4ever

Posted
Posted

The biggest help for a fast start on my '02 was installing an Optima battery. It'd start FAST then. High current reserve is your friend.

Would make no difference on DI. Crank is computer controlled.

patriot Enthusiast

patriot

Posted
Posted

Would make no difference on DI. Crank is computer controlled.

Yeah..what do I know... I'm just a EE.

 

Basic physics. More current available= starter turns faster.

It has NOTHING to do with being computer controlled. The computer does NOT control the starter's RPMs. It controls the starter solenoid and the engine.

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