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Why does my Truck keep Stalling?

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2006gmc

Joined: Dec 05 2008
Posts: 4
Location: Edmonton, Alberta

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2006 GMC Sierra
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Post Sun Apr 05, 2009 10:13 am

I Just recently bought a 2003 GMC SIERRA Truck. It ran good for a few weeks and then the battery kept dying. I had the battery tested and it was no good, so I replaced it. The new battery works well and never dies. Now, most of the time when I slow down my truck stalls. What could be causing this? I was also stalling a lot with the old battery in.

ps. It is an automatic Tranny
justinwebb

Joined: Sep 15 2004
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Location: Columbus, OH

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Post Sun Apr 05, 2009 10:15 am

tune up recently? Vacuum leak? need lots more info
justinwebb

Joined: Sep 15 2004
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Post Sun Apr 05, 2009 10:16 am

also have you had your alternator tested? It could have killed the battery and not supplying enough juice to keep it going or just enough to barely charge the battery but not enough for everything else
BLAZER_97

Joined: Apr 10 2007
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Location: Decatur TX

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Post Sun Apr 05, 2009 10:18 am

low fuel pressure?
A-Ray

Joined: May 01 2005
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Post Sun Apr 05, 2009 10:26 am

I sorta agree with justinwebb. Sounds a lot like a vacuum leak issue, but could also be a bad alternator.
justinwebb

Joined: Sep 15 2004
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Post Sun Apr 05, 2009 10:38 am

start with one thing and work your way to others

you only need air, fuel, and spark....one of those isnt working
corvettecrazy

Joined: Dec 17 2003
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Post Sun Apr 05, 2009 11:12 am

I agree you should have your alt tested. I doubt it has anything to do with the stalling issue but it definitely could have caused the battery to die.

Fuel press, vacuum leak, bad plugs and wires

Some things to consider evaluating.
Kwonrae

Joined: Apr 27 2004
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Post Sun Apr 05, 2009 4:06 pm

Will it stall if when slowing down you put it in NEUTRAL and keep the Rpms above 1k+?? That's your alternator brodude.
JSewell

Joined: Mar 22 2009
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Post Sun Apr 05, 2009 4:10 pm

is the fluid good, maybe you missed that??
Tdawgthegreatest

Joined: Jul 22 2007
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Location: Florence, Oregon

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Post Sun Apr 05, 2009 5:28 pm

Im thinking the Alt. Cause when he slows down, so does his rpms. Making it easier for the alternator to seize up. Which inturn stalls the other pullies. Making his truck stall.
02BlueStang

Joined: Dec 13 2004
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Post Sun Apr 05, 2009 7:38 pm

if the truck is completely dying I would check your fuel injectors....how often does it stall? Everytime you stop? It could be your alternator as well but if the truck is starting after sitting for awhile then that would not be it...as your battery would be dead and you would be jump starting it all the time since the batt would not be charging when you are driving it.

Sounds like a fuel issue....go to autozone etc and hook it up to a code reader for the PCM...see if it is throwing any codes
Tdawgthegreatest

Joined: Jul 22 2007
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Post Sun Apr 05, 2009 7:46 pm

Oh yes.
Fuel Filter also.
GlowinPontiac

Joined: Mar 04 2004
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Post Sun Apr 05, 2009 8:27 pm

does the check engine light come on right before it stalls? Try taking it to autozone and drive around the lot till it stalls. Then leave the key on and go grab their code tester and see if the computer is throwing any faults. Will it die if you let it idle or only when you slow down to stop? Start by checking for any broken/frayed wires and cracked or disconnected vacuum lines. If all that checks out good and its not throwing codes then you should check the fuel pressure and have the alternator tested. I seriously doubt the alternator seizing would cause it to stall as it happened to me once on my old Plymouth POS and all it did was cause the belt to slip and squeal until it snapped and the engine kept on running and this was on a 4cyl making less than 90hp. A fullsize truck should have enough power to either slip the belt or snap it and keep running until the battery dies.
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