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Gmc 1500 6.2 won't start sometimes

doozer78

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doozer78 Enthusiast

doozer78

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So my 14 sierra allterrain 6.2 didnt always sound healthy when starting. It seemed weak but still would start. So other day I went to start it and nothing. i was in a hurry and took my other car. Next day it started up. Been fine for a few weeks. We were out tonight at lowes. Went to leave store and bam again dead. Put a jumper box on it battery read almost 13 volts. Tried jumping it from another vehicle...nothing helped. I had a suspicion it wasnt battery. So I started looking at starter and seen that when trying to start truck sparks were shooting out of starter but still won't start. I started moving main wire going into center of starter, tried starting truck again and finally it cranked over and started but it shot out sparks when doing so. Is it safe to guess starter is bad or should I look elsewhere? Thanks for input.

 

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Logan Lanfear Enthusiast

Logan Lanfear

Posted
Posted

Sparks coming out of anything is not the best. I would bring it to a shop somewhere or the dealer. They would probably be able to tell you for sure if its the starter or something else.

x219c Enthusiast

x219c

Posted
Posted

You said you were moving the wire going to the starter? Is it loose? That could cause sparks.

 

 

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Nargg Enthusiast

Nargg

Posted
Posted

OK, work with me here.... I recall when GM did a big revamp of their engine about a decade ago.... give or take. Even for a while they held within their warranty a "start of the engine within a single crank" kind of verbage....

 

Needless to say, this was fantastic. I got very used to GM engines being very eger to start. I now have a 2015 Silverado. OK, yes, it starts by itself no matter what. BUT, it seems to take a LOT of turns/cranks to start on a cold day. We all know that today, engines use computer help to start. Hence the remote starts, and app starts, etc etc. Yes, even the key only communicates to a computer "start me up" and away it goes. But the start is so much more difficult today than it was only a few years ago. As it seams....

 

*soap box for sale....

 

:)

Bowtie Billy Hill Enthusiast

Bowtie Billy Hill

Posted
Posted

So my 14 sierra allterrain 6.2 didnt always sound healthy when starting. It seemed weak but still would start. So other day I went to start it and nothing. i was in a hurry and took my other car. Next day it started up. Been fine for a few weeks. We were out tonight at lowes. Went to leave store and bam again dead. Put a jumper box on it battery read almost 13 volts. Tried jumping it from another vehicle...nothing helped. I had a suspicion it wasnt battery. So I started looking at starter and seen that when trying to start truck sparks were shooting out of starter but still won't start. I started moving main wire going into center of starter, tried starting truck again and finally it cranked over and started but it shot out sparks when doing so. Is it safe to guess starter is bad or should I look elsewhere? Thanks for input.

 

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Sparks from a starter are never a good thing. When I sold and tested starters, the only ones that would spark were the worn out starters that were drawing WAY too much juice, and not turning over anymore.

 

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SSam Enthusiast

SSam

Posted
Posted

My 6.2 starts up fine, but does have a squeak for the first few seconds after it starts.

Sounds like a pulley , thinking the AC.

Drives me crazy, but I assume it will be called out as normal.

 

-S

doozer78 Enthusiast

doozer78

Posted
  • Author
Posted

Let me correct myself so I crawled under the truck it was looking at the starter. You have the starter itself and the selenoid on top of it. Now there is another cylinder type object that is hanging alongside the starter and it has a wire going into the center of it that is where the Sparks were shooting out of but I can't seem to find with that piece is on the parts breakdown anybody have any ideas?

 

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doozer78 Enthusiast

doozer78

Posted
  • Author
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It looks like it might be part of the wiring harness after looking at the harness on the parts breakdown

 

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markreed Enthusiast

markreed

Posted
Posted

OK, work with me here.... I recall when GM did a big revamp of their engine about a decade ago.... give or take. Even for a while they held within their warranty a "start of the engine within a single crank" kind of verbage....

 

Needless to say, this was fantastic. I got very used to GM engines being very eger to start. I now have a 2015 Silverado. OK, yes, it starts by itself no matter what. BUT, it seems to take a LOT of turns/cranks to start on a cold day. We all know that today, engines use computer help to start. Hence the remote starts, and app starts, etc etc. Yes, even the key only communicates to a computer "start me up" and away it goes. But the start is so much more difficult today than it was only a few years ago. As it seams....

 

*soap box for sale....

 

:)

On my 2017, it has taken me a bit to get used to starts with the DI motors. From what GM states, they need about 30% longer to start then Non-DI motors. That may be part of your frustration.

 

OP, sparks are bad, buddy. If you are unsure what is going on, I would recommend taking it somewhere. Take a second to make sure everything is tight, you should be able to move any wires.

Nargg Enthusiast

Nargg

Posted
Posted

On my 2017, it has taken me a bit to get used to starts with the DI motors. From what GM states, they need about 30% longer to start then Non-DI motors. That may be part of your frustration.

 

OP, sparks are bad, buddy. If you are unsure what is going on, I would recommend taking it somewhere. Take a second to make sure everything is tight, you should be able to move any wires.

 

that info is very good to know. I have thought about putting after market plugs in. Something I've done in the past with good results. Maybe it's time for me to consider that here, especially since the warranty is only a couple months before expiring anyway. Thanks for the info!

doozer78 Enthusiast

doozer78

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  • Author
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I believe this is the part where sparks are flying still need to look at it though. Its not a daily driver so havent had time yet. Its the cylinder type object right next tonstarter with wire in center. Anyone know what this is and if it has anything to do with starter?looks like,it part of wiring harness 9cc9ec7ec407a4a5f247c9e744649207.jpg

 

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doozer78 Enthusiast

doozer78

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Anyone know what this part is?

 

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fishlessam Enthusiast

fishlessam

Posted
Posted

Starter problem,mine did the same thing,complained 3 times before before i told the service manager on the last visit that iam not taking the truck back until its fixed.

dagwood2001 Enthusiast

dagwood2001

Posted
Posted

starting to have the same problem with my 5.3L V-8. twice, it wouldn't start, had it jumped by roadside assistance. The first guy who jumped be was just some garage guy, but the second was a GM Mechanic who said they are seeing, in his words, "tons" of battery issues lately.

 

mine is a 2015 Crew Cab with only 11,000 miles on it......if it happens again, I'm taking it in. Are batteries covered by warranty? I'm thinking a new battery for an engine that big can't be cheap......

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