5.3 engine starting problems

[euromade]

I noticed this on my 2014 Chevy and especially when using E85. Have not had a chance to observe this yet on my 2015 Sierra, as I only had it for a week now ( I put only 200 miles on it so far). Today is close to 0F ; will report back if there are any issues.

[seansharley]

Cold temps, dry gas (isopropenol helps) you may wanna find a different gas station, if you're using the same one all the time, and a tank of 93 octane. Worth a shot before you go nuts

[donc]

Latest update- I took my truck to the dealer last night to have it tested on the computer. They say there were two service engine codes; po689 and p1682 and a 3343 code for ig relays. They cleared the codes and thought possibly the relay (IG) was frozen, no parts replaced? I'm going back tomorrow to talk to the service manager as this doesn't make sense.

 

My problem evolved when I started the truck getting ready to leave a hotel. I ran the engine for 15 minutes to warm it up while I tied down snowmobiles and prepared to leave. I shut the truck off, went into the hotel for 10 minutes to check out and when I returned the engine cranked but would not fire, after four or so attempts at starting and maybe 20 minutes later the engine started instantly when I turned the key, no 3-4 second cranking like normally. Something was holding out the spark I think.

 

The truck sat there for 2 days but it started , so I wonder how they assumed something was now frozen after the engine ran for 15 minutes, was reaching mid temperature and was off for maybe 10 minutes. Sounds to me like a relay stuck or something else is wrong so now I'm supposed to keep driving and hope this doesn't occur again when I'm 200 miles away from home in the mountains somewhere.

 

I know they are different animals, but my fuel injected snowmobiles start instantly after sitting in storage for 7-8 months or under extreme cold conditions!

 

don

 

Last update: Service manager looked at report and ordered new ignition relay before I even asked; hopefully this will be the end of that problem.