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Engine noise?

Tiny
ADAM SACKLER
  • MEMBER
  • 2007 GMC YUKON
  • 150,000 MILES
I changed all the sensors that the codes were throwing and it was still throwing those codes after I changed them. So I changed the spark plugs, now it drives great but the idle still sounds rough. I don't hear it as much when accelerating in higher gears now that I have changed the spark plugs, but when idling and taking off it does not sound good. Looking for some guidance.
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Sunday, October 20th, 2019 AT 4:06 PM

22 Replies

Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
Welcome to 2CarPros!

You mentioned the codes returned after replacing the suspect sensors. Even though the engine is running better with the new plugs installed, are the codes still present? If so, can you provide these codes?
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Monday, October 21st, 2019 AT 8:00 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
No, the codes are not present, the codes were P0700, P0716, and P0717. The car is driving better, but the engine is still sounding rough. I'm not sure if it would be one of the control modules causing the problem or not. The engine is sounding rough though, knocking or rattling sound or whatever you want to call it.
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Wednesday, October 23rd, 2019 AT 12:34 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,389 POSTS
It sounds like you may have an injector going out. Can you please shoot a quick video with your phone so we can hear the noise? That would be great. You can upload it here with your response. That way we can tell for sure whats going on.
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Saturday, October 26th, 2019 AT 12:48 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
See I'm not sure if you would call that a rattling or knocking, but it does not sound right and is not sounding smooth. It was driving better at first after I changed the spark plugs, but now it is starting to shift hard out of first gear again.
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Sunday, October 27th, 2019 AT 12:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,389 POSTS
Thanks for the video, it helps. Let remove the serpentine belt and restart the engine to see if the noise is gone. Here is how:

https://www.2carpros.com/articles/replace-serpentine-belt

Please upload a video of the belt removed. Please let us know what happens.
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Monday, October 28th, 2019 AT 12:01 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Should I take off the A/C belt too or just the big one?
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Saturday, November 2nd, 2019 AT 12:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,389 POSTS
Try the main belt first, let me know. Here are the instructions in the diagrams below.
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Saturday, November 2nd, 2019 AT 12:55 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Okay, I watched the video and I'm not sure if it sounds problem free without the belt or not. I can kind of hear a sound in the video and I wasn't sure if it was a rattling or not. But it sounds so much better without the belt. It wasn't on the video but when I was standing there recording it I was hearing a humming sound. I wasn't sure if that was because the belt was off or if that is a problem also. Does this help? Do you know what the problem is?
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Saturday, November 2nd, 2019 AT 2:15 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
I ordered a transmission control module because I think that is the source of my problems, or at least some of them. Did the video help? Were you able to figure anything out?
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Sunday, November 3rd, 2019 AT 4:41 PM
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
I agree, it sounds significantly better. It appears one of your engine accessories has a failed bearing. I would start by spinning each pulley (including the tensioner) and see if any of them feel rough. Based on the severity of the noise, I would expect you'll be able to feel it pretty easily.
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Sunday, November 3rd, 2019 AT 6:03 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Would that have anything to do with it shifting hard? Or do you also agree I have a problem with the transmission control module?
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Monday, November 4th, 2019 AT 8:14 AM
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
I think the two conditions are probably unrelated. Have any of the transmission codes returned?
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Monday, November 4th, 2019 AT 10:10 AM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Yea, my check engine light came back on. I have not went to get the codes checked, but every time I get them checked it is the same codes; P0700, P0716, and P0717 and I have replaced all of the sensors. Previously I have replaced the throttle body with sensor, the transmission input sensor, and I replaced the gas pedal with sensor and I also replaced the connectors to the sensors in case of wiring going bad. I unplug the battery when I work on it, so the codes clear and it drives better for a short amount of time but then starts shifting hard again and throws the same codes. So I'm thinking at this point it would be the transmission control module?
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Monday, November 4th, 2019 AT 10:18 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,389 POSTS
Please start a new thread for the transmission issue please stick to the engine noise problem on this post. We must keep the subject matter the same throughout the post.

Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Please let us know which accessory or belt tensioner is making the noise, sounds like a belt tensioner to me.

Cheers, Ken
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Monday, November 4th, 2019 AT 11:42 AM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Yea. It was the tensioner pulley.
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Monday, November 4th, 2019 AT 12:35 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Actually, I forgot about the position of the tensioner pulley when I tested it and it was resting up against something since it is not in tension. I pushed it out with my ratchet and gave it a spin and it is rotating just fine, the idler pulley also is rotating freely and so is the alternator. The power steering pulley does not make noise when I rotate it and seems to turn smoothly but does not rotate freely when I spin it, it will only make a rotation or two before stopping. The water pump pulley rotates freely but makes a noise when I rotate it.
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Monday, November 4th, 2019 AT 1:08 PM
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
The water pump sounds pretty rough to me too. I would definitely say that's the source of your noise. Below is the procedure on how to replace a water pump. There's also a great video of the procedure towards the end of the article.

https://www.2carpros.com/articles/water-pump-replacement

You may also want to verify that the belt tensioner arm is not binding. When you load and unload the spring tension on it, make sure it moves smoothly from the full tension point to the fully unloaded position.
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Monday, November 4th, 2019 AT 6:04 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Okay, thanks. It seemed to be moving smoothly but I will check it again to make sure. Thanks for your help.
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Monday, November 4th, 2019 AT 10:40 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
The belt tensioner moves back and forth fine. There is just some noise in the spring, is that okay?
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Tuesday, November 5th, 2019 AT 6:26 AM
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
Yes, a little noise from the spring is fine as long as it moves freely.
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Tuesday, November 5th, 2019 AT 9:38 AM

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