Thanks Dillon. I dropped it off at the shop on Monday and will be checking with them to see if they were able to reproduce the sound. Thank you for reviewing the video and looking for a solution. I'll take a look now and look for what you saw. Would be great if that's it!
Loud *clank* sound from engine - 2007 Tahoe 5.3L
- Thread starter hound_dog
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
swathdiver
Full Access Member
Now how on earth fellas is that clank related to a coil or two with no moving parts???
iamdub
Full Access Member
INB4 "It's still doing it and now the shop wants to try ______."
Dillon2222
Member
- Joined
- Apr 3, 2017
- Posts
- 34
- Reaction score
- 22
If its cylinders 1 and 7 those are AFM cylinders and you might have a lifter that is stuck, causing the misfire. That can get costly real quick. Still think that noise is coming form the water pump though. JMHO
So the morning startup after I picked it up...clank! 5 times actually.
Swathdiver was right...how could this solve the clank? It didn't. The coil replacements were to try to solve the misfires (measured). Not sure if it did anything ask the idle is still a bit rough.
I'm at a loss here. Options are to just drive it until it gets worse or won't run....or maybe take it to the dealership and hope they can figure it out. Since everyone has been stumped, it doesn't seem like it will be an easy fix.
Dillion2222: if the sound is coming from the waterpump ....I should just drive it until the waterpump dies. It's not leaking and not overheating so it seems to be doing its job. Agree?
Swathdiver was right...how could this solve the clank? It didn't. The coil replacements were to try to solve the misfires (measured). Not sure if it did anything ask the idle is still a bit rough.
I'm at a loss here. Options are to just drive it until it gets worse or won't run....or maybe take it to the dealership and hope they can figure it out. Since everyone has been stumped, it doesn't seem like it will be an easy fix.
Dillion2222: if the sound is coming from the waterpump ....I should just drive it until the waterpump dies. It's not leaking and not overheating so it seems to be doing its job. Agree?
swathdiver
Full Access Member
What do your plugs look like on 1 and 7? Did you get a stethescope?
Scooty
Member
- Joined
- Nov 8, 2016
- Posts
- 54
- Reaction score
- 43
I had an intermittent clank on my 08 just this winter. My mechanic put on a lift and checked everything that could possibly be loose and found nothing. he then started it while on the rack and thought it was coming from the starter. Sure enough after pulling the starter he saw the pinion gear was not disengaging all the way from the flywheel. It was barely touching the flywheel thus causing the intermittent clank. Replacing the starter fixed it...just my experience.
Awesome post Scooty! Did yours only do it while cold or also while driving?
Thank you very much for taking the time to read these problem threads and maybe striking gold. I will see what I can do to determine if the sound is coming from the starter.
Thank you very much for taking the time to read these problem threads and maybe striking gold. I will see what I can do to determine if the sound is coming from the starter.
Scooty
Member
- Joined
- Nov 8, 2016
- Posts
- 54
- Reaction score
- 43
Also while driving. It started the Saturday before Christmas and the local shop I went to was closing early but said he didn't want me leaving on the chance of causing more damage. After he got the starter off you could hear there was something loose in it. He thought the pinion would slide out and hit the flywheel and that would kick it back causing the clank. Again this was my experience ...hope this helps you.
Last edited:
Similar threads
