Start issues

[Powersc17]

My 2014 GMC Sierra has about 1000 miles on it when it sits over night and is cold it takes a lot to start it instead of the normal quick start any ideas on what could cause this?

[Chris the navy mech]

mine does this after long cold night it could be that the battery that came with your truck when you bought it was sitting for awhile. with all the electronics on these trucks it could have eating up some of the amps.

[Gringo1873]

I have noticed that my 2014 Sierra typically takes longer to start than my 2007 Silverado did, especially after sitting overnight.

 

Gringo

[HondaHawkGT]

It can take up to 10 seconds to start depending on just how cold it is. The delay is a result of the mechanical fuel pump -- it's powered by the cam and takes more time to build fuel pressure when it's cold or the truck sat a while.

[GMCustomerService]

I understand that you have a concern about how long it take for your Truck to start when cold, Powersc17. Your fellow forum members have provided you with some insight but if you have any lingering concerns, please feel free to contact us.

 

Jennifer T.

GM Customer Care

[redwngr]

My 2014 GMC Sierra has about 1000 miles on it when it sits over night and is cold it takes a lot to start it instead of the normal quick start any ideas on what could cause this?

Is it the same if you leave it in the 'on' position and let the computer start up before turning it to start vs immediately turning to the 'start' position?

[310racing]

I switched to E-85 2 tanks of gas ago, and noticed my truck spun longer before cranking. Just switched back to 93, will see if that changes anything.

[Andy Chabot]

I have experienced this also... It is normal apparently. It is weird to just do a quick turn of the key and let the engine start itself...

[timstruck]

Hey everyone. I have also noticed this running E85 only. New tank of regular and truck starts up immediately. GM Service?

[310racing]

I ran my tank of E-85 down to 4 gallons remaining. Went and filled up with 93, starts right up, no long turn over.

 

Appears it just takes a few more revs before firing off with E -85.

[GMCustomerService]

Hello timstruck,

I see you have concerns about how your truck may take longer to start when running on E85 compared to regular. I’m glad some members on the forum have given their advice. Although I’m not technically trained, I can reach out to your dealership if you decide to take it in. Just send a private message if I can be of any assistance.

Sincerely,

Eddie A.
GM Customer Care

[30 yards]

Guys, our new gen 3 ecotech are running a high pressure injection system that requires normal 30-50 psi fuel pressure to jump to 15-20,000 psi to run the direct injection. I notice this on my 2014 and know that you can have some normal bleed down through this system.

[j5wilson]

I also noticed this on my current tank of e85. I normally never use it but figured I'd try it out, definetly takes longer to crank than the usual 87 octane

[gone_fishing]

I found some information in an ACDelco Techconnect issue regarding the cranking times for the DI motors. I attached the article as a picture. Here is the issue where I got this information: http://acdelcotechconnect.com/pdf/newsletters-press-releases/acdelco/2014/ACDelco-TechConnect-May-June-2014-Newsletter.pdf

[SouthernSilveradoGuy85]

I just run 87 octane and don't have any issues and starts right up. There's been a handful of times where it took an extra second so not too worried. Been starting fine ever since I bought it and it just hit 7,000 yesterday.

 

About the ones mentioning E85. It makes sense that E85 would be a little harder to start since it requires more of it to burn normal, which is why mileage is worse but seems to give a little more power.