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cm5 Enthusiast

cm5

Posted
Posted

traded in for 2009 gmc sierra. couldnt pass up deal on the new ride and the values on my trades. anyway- when i turn the key to run or shut the truck off i can hear a noise. the noise sounds electrical in nature? its hard to locate by mself to distinguish it better. not surfe if it battery related? the noise isnt loud but it is noticeable.

 

in addition the engine itself pings (detonation) which i hope goes away? put in 93 octane in and hoping that when the engine breaks in more goes away?

i will have dealer take a listen but might not gey many answers.

 

figured would start here to see if any of you have any suggestions as to what the noise could be? or if you have had simliar issues?

 

the motor is a 5.3l and i have never heard it on any of my other trucks in the past.

kdogg Enthusiast

kdogg

Posted
Posted
traded in for 2009 gmc sierra. couldnt pass up deal on the new ride and the values on my trades. anyway- when i turn the key to run or shut the truck off i can hear a noise. the noise sounds electrical in nature? its hard to locate by mself to distinguish it better. not surfe if it battery related? the noise isnt loud but it is noticeable.

 

in addition the engine itself pings (detonation) which i hope goes away? put in 93 octane in and hoping that when the engine breaks in more goes away?

i will have dealer take a listen but might not gey many answers.

 

figured would start here to see if any of you have any suggestions as to what the noise could be? or if you have had simliar issues?

 

the motor is a 5.3l and i have never heard it on any of my other trucks in the past.

I don't think these engines like the high octane gas.

cm5 Enthusiast

cm5

Posted
  • Author
Posted

i've run the higher octane with other trucks fine. i tried it now cuz the truck was 'bout 1/8 of a tank left and not sure if the truck was sent to the dealer with e85 in it or not. plus not sure if the dealer used crap gas or not.

2005LT Enthusiast

2005LT

Posted
Posted

Not sure about the pinging but that 'electrical' sound you hear is just the auto climate control fan if i'm not mistaken. Someone around here probably has the better technical name for it. It should disappear after a few seconds.

cm5 Enthusiast

cm5

Posted
  • Author
Posted
Not sure about the pinging but that 'electrical' sound you hear is just the auto climate control fan if i'm not mistaken. Someone around here probably has the better technical name for it. It should disappear after a few seconds.

 

just odd never heard it on my other rides. but yea after a second or two goes away, makes sense.

superjim Senior Enthusiast

superjim

Posted
Posted
traded in for 2009 gmc sierra. couldnt pass up deal on the new ride and the values on my trades. anyway- when i turn the key to run or shut the truck off i can hear a noise. the noise sounds electrical in nature? its hard to locate by mself to distinguish it better. not sure if it battery related? the noise isnt loud but it is noticeable.

 

 

The noise may be the cooling fan INSIDE the radio.

If you have the NAV system, it may be the NAV unit booting up.

It could also be the fan for the AUTO CLIMATE CONTROL.

I think this one is in the right side of the headliner...right close to your head.

cm5 Enthusiast

cm5

Posted
  • Author
Posted

an update. i had the 4 wheel drive switched turn to the auto setting. i turned it to the 2wd mode and the noise is almost completely gone. must have something to do with the transfer case initializing or some crud. i tested all 4wd settings and seemed to work fine.

 

installing AT grille now!

VMax2007 Senior Enthusiast

VMax2007

Posted
Posted
an update. i had the 4 wheel drive switched turn to the auto setting. i turned it to the 2wd mode and the noise is almost completely gone. must have something to do with the transfer case initializing or some crud. i tested all 4wd settings and seemed to work fine.

 

installing AT grille now!

 

:puke::lol: Post pics!

BrockwayMT Enthusiast

BrockwayMT

Posted
Posted

It's just the actuator on the transfercase. I'd have to check with a controls guy but IIRC when you shut off the truck the actuator moves back to 2HI. When you restart the truck it will move back to its adapt-ready position for auto 4wd.

Sir Dan Enthusiast

Sir Dan

Posted
Posted

Never heard a thing with mine left in auto or 4 HI after shutdown or otherwise. But then again I've been accused of being DEAF and sometimes DUMB! haha

cm5 Enthusiast

cm5

Posted
  • Author
Posted
It's just the actuator on the transfercase. I'd have to check with a controls guy but IIRC when you shut off the truck the actuator moves back to 2HI. When you restart the truck it will move back to its adapt-ready position for auto 4wd.

 

 

thanks!

BrockwayMT Enthusiast

BrockwayMT

Posted
Posted

I was wrong about 2HI. It goes to partial lock when you shut off in auto. I'm told it does a learn procedure about 15 sec after you shut it off in auto. When you start it up it releases from partial lock and goes back to adapt ready. This is so if you park on a hill with mud or snow in auto and you have no traction on the back the tcase locks so the park pawl will hold the front tires as well.

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