6.2L (L9H) Owners - Get all your questions answered here

[stefman722]

Hey guys,

 

I have a 2013 with the 6.2L and have a question to see if anyone else has the same issue. It has been -40 Celsius (same in fahrenheit) for the last two nights. My truck has been plugged in both those nights. When I came to start it both times, the truck cranks no problem, starts has a rough idle for 3-5 seconds, sputters and shuts off. I start it again and it starts without any issues the second time. I have NEVER had a vehicle do this including my last silverado with the 5.3L.

Just curious is the 6.2L not as good in the cold? Is this normal? My truck only has 15,000km

[RyanbabZ71]

Hey guys,

 

I have a 2013 with the 6.2L and have a question to see if anyone else has the same issue. It has been -40 Celsius (same in fahrenheit) for the last two nights. My truck has been plugged in both those nights. When I came to start it both times, the truck cranks no problem, starts has a rough idle for 3-5 seconds, sputters and shuts off. I start it again and it starts without any issues the second time. I have NEVER had a vehicle do this including my last silverado with the 5.3L.

 

Just curious is the 6.2L not as good in the cold? Is this normal? My truck only has 15,000km

 

Actually had this happen once about a month ago. Temp was in the teens and my truck was in the garage. Fired right up the 2nd time. Hasn't happened since.

 

 

Ryan

[EX-F150 owner]

Block heater? I don't have any issue with mine. Have you tried leaving it unplugged to see if it happens cold?

[RyanbabZ71]

Mine doesn't have a block heater

 

 

Ryan

[stefman722]

I haven't tried without the block heater plugged in. I doubt it will make much a difference seeing how the GM block heater barely ever turns on apparently. I left it outside tonight unplugged, Ill report back with results in the morning. Glad to hear though that someone else had the same problem.

[stefman722]

So after the truck spending another cold night outside (-33) I started it up this morning without having it plugged in. To my surprise It started up first shot without a problem at all. Just the typical cold weather squeak all cars have haha. I read up and found that the block heater being plugged in for extended periods of time causes issues. Its recommended to only plug it in 3 hours before you intend on leaving...wtf kind of poopoo is that?

 

My truck starts better without it being plugged in it seems. weird. Ill plug it again tonight but I am sure the same thing will happen.

[EX-F150 owner]

I don't know from experience but have read post from other's having this issue when using the heater. Best I can suggest is to talk to your dealerships service department as to why this does this, and hope they don't blow smoke. My best guess on it is that the temp sensor the computer is reading is either reading too hot or too cold for what the block actually is... but that is just my guess on it. Hope you figure it out.

['01LS1]

Find a timer for the cord. Thinking even with the LLY & LBZ Diesels they recommended 2 hours & not plugged in all night.

[Wolfmanjohn]

I'm thinking with EX-F150 on this; intake air temp not jibing with coolant temp equals a confused PCM in open loop operation.

[stefman722]

So I spoke with the dealer today. They said the same thing as was mentioned above, that they know about this issue, and there really is no fix other then getting a timer for the block heater cord and don't recommend cutting the end and installing a normal plug end. He said they have no clue why GM did something stupid like this and that I was better off leaving it unplugged then plugged in...

[Bvancura6.2]

 

The hemi's not even a challenge, but on paper, the new ecoboost is. I think from a dead stop the 6.2L would pull a pretty quick lead but the ecoboost would catch up in the end. Which is faster.. well it would be close.

 

 

The hemi's not even a challenge, but on paper, the new ecoboost is. I think from a dead stop the 6.2L would pull a pretty quick lead but the ecoboost would catch up in the end. Which is faster.. well it would be close.

[CRSilverado]

Haven't read though all 46 pages of this link but I would like to know if anybody makes 1 3/4" or 1 7/8" shorty set of headers for the 6.2. I read an article where 1 5/8" shorty headers produced 9hp over stock and 1 3/4" long tube 21hp. Not really a fair comparison unless both same diameter IMO.

[bird38]

I havent seen a set bigger than 5/8th either. No matter what size diameter you will always see greater gains with long tubes as opposed to shorties.

[CRSilverado]

The area of the exhaust port on our heads is larger then the ID area of 1 5/8" tubing. I'm surprised 1 5/8" doesn't produce less power than the factory manifolds.

 

Would like to see an equal tube comparison of shorty vs. long tubes.

[Bvancura6.2]

So I'm thinking about putting the autocal in my 2013 Chevrolet 1500 it still has warranty and according to the guy I been emailing He says it won't leave a footprint in the computer so if I have to have warranty work done I just return it to stock and they wouldn't know I had a tune in it is this true or not