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Engine Grinding noise

Tiny
SAMIAMINMN
  • MEMBER
  • 2008 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 239,000 MILES
When I turn my key to on, not actually trying to start the vehicle, I hear a grinding noise, it seems to be coming from somewhere near the intake. When driving the vehicle this noise goes in and out as well. My oil pressure gauge is not registering any pressure either. Oil level is full and I just had it changed.
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Sunday, December 8th, 2019 AT 9:05 AM

14 Replies

Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
Hello,

Can you record the sound so we can hear it please?Video is fine too. These Chevrolet's have all kinds of strange grinding noises.
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Sunday, December 8th, 2019 AT 9:25 AM
Tiny
SAMIAMINMN
  • MEMBER
  • 7 POSTS
Video added.
Video (Click to make bigger)
Thumb
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Sunday, December 8th, 2019 AT 10:44 AM
Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
Okay, these vehicles have an air injection system to pump more air into the engine. That's what it sounds like to me. It's definitely a strange noise. The pumps go bad causing these noises. And actually it's supposedly pretty easy to change. But that's my diagnosis.
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Sunday, December 8th, 2019 AT 11:01 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Can you take another video for under the hood if that is where the noise is coming from please? Can you tell where the noise is coming from?
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Sunday, December 8th, 2019 AT 11:13 AM
Tiny
AL514
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Can you take that plastic cover off the top of the intake? It sounds very close to the throttle body.
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Sunday, December 8th, 2019 AT 11:26 AM
Tiny
SAMIAMINMN
  • MEMBER
  • 7 POSTS
Video added, starting it as well.
Video (Click to make bigger)
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Sunday, December 8th, 2019 AT 11:31 AM
Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
So what you can do, is start unplugging things and try it with just the key on, not running and see if you can isolate the noise.
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Sunday, December 8th, 2019 AT 11:36 AM
Tiny
SAMIAMINMN
  • MEMBER
  • 7 POSTS
Tried disconnecting multiple plugs and couldn't isolate the noise.
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Sunday, December 8th, 2019 AT 12:12 PM
Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
Did you unplug the throttle position sensor? And the idle control valve? I've read up on this and it always seems to be the throttle body. And is this drive by wire system? Meaning no cable for the throttle plates, just an actuator that moves the throttle.
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Sunday, December 8th, 2019 AT 12:47 PM
Tiny
AL514
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Also try unplugging the abs unit, it may be running a self test at key on.
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Sunday, December 8th, 2019 AT 12:49 PM
Tiny
SAMIAMINMN
  • MEMBER
  • 7 POSTS
Did the throttle body unit, that is what was making the sound.
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Sunday, December 8th, 2019 AT 1:01 PM
Tiny
SAMIAMINMN
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  • 7 POSTS
Replaced the throttle body unit, no more grinding.
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Sunday, December 8th, 2019 AT 2:44 PM
Tiny
AL514
  • MECHANIC
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Good news.
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Sunday, December 8th, 2019 AT 4:02 PM

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