GM Inside - Ford Inside - Ford Ranger - Jeep - American Muscle

Support FSC and see no ads! - Click Here
Page 1 of 2 12 LastLast
Results 1 to 20 of 22

Knocking noise in 2003 Denali

This is a discussion on Knocking noise in 2003 Denali within the Technical / Maintenance forums, part of the General Discussion category; Okay, so I have a 2003 Yukon Denali, and I just noticed a slight knocking/ticking sound that is coming from ...

  1. #1
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Knocking noise in 2003 Denali - VIDEO NOW POSTED...


    Support FSC and see no ads! - Click Here
    Okay, so I have a 2003 Yukon Denali, and I just noticed a slight knocking/ticking sound that is coming from my engine. I'm pretty mechanically inclined, but I have never really done any internal work on engines and it sounds like this may be something like that. It's not a very loud noise, just a faint knocking/clicking/ticking sound that occurs about 3-4 times per second. Anyone have any ideas on what this noise might be?
    Last edited by jleonard711; 07-09-2007 at 11:11 PM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  2. #2
    Registered User
    Join Date
    Jul 2004
    Location
    Kansas City
    Age
    36
    Posts
    507

    Re: Knocking noise in 2003 Denali

    sounds like knocking pistons or something of the like. how is your oil pressure? If it's low it can cause knocking. also, if you put in higher octane does it go away?

  3. #3
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    Quote Originally Posted by Old77
    sounds like knocking pistons or something of the like. how is your oil pressure? If it's low it can cause knocking. also, if you put in higher octane does it go away?
    My oil pressure is perfect. As for higher octane gas, I already use 91 octane which is the highest you can get here in AZ. And I even have my truck tuned specifically for use with 91 octane fuel.

    I did let it sit in my driveway running for about an hour a few weeks ago (I forgot the truck was on), and when I came back out the temp guage was way past the red zone and I got a warning message in my dash that my coolant temp was too high. It was shortly after then that I noticed the knocking sound. Could that have somehow damaged something internally in the engine, and if so, what?? A buddy of mine told me it sound like a lifter, but I honestly know nothing about engine internals which is why I'm turning to the forum for help. I'll probably just take it into a shop, but I want to go in there having at least an idea of what it might be...
    Last edited by jleonard711; 07-03-2007 at 04:12 AM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  4. #4
    Registered User
    Join Date
    Jul 2004
    Location
    Kansas City
    Age
    36
    Posts
    507

    Re: Knocking noise in 2003 Denali

    Over heating is definitely not good and can cause internal issues and therefore cause knocking!!

  5. #5
    Homesick NBer
    Join Date
    Jul 2005
    Location
    Edmonton, AB (but still an easterner at heart)
    Age
    29
    Posts
    2,395

    Re: Knocking noise in 2003 Denali

    very common on the denali, the dealership i work at just did like 5 engine rebuilds on 2002-2004 denalis, in the last 2 months, and they all had the same knock.
    2003 Chev Silverado 4x4 4.10 gears and it has a 4.8L
    1997 GMC Sierra 4x4 4.3L 4L60E KOSS CD player,16mpg,3.73 gears z71 skid plates <<<sold

    4th year apprentice at Chev Dealer

  6. #6
    Basterdization Specialist mousemotorman's Avatar
    Join Date
    Jun 2007
    Location
    Olympia, Washington
    Age
    51
    Posts
    140

    Re: Knocking noise in 2003 Denali

    Does it continue when you rev it?
    Get louder ? Goes away ? How does it run ?

    With the over heating, it could be bad or it could be something simple as the idler pully on the serpentine belt. more info please.
    Last edited by mousemotorman; 07-03-2007 at 04:25 PM.
    No rats just mice
    96 Z-71
    83 S-10 V-8
    06 Hemi Commander

  7. #7
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    Quote Originally Posted by mousemotorman
    Does it continue when you rev it?
    Get louder ? Goes away ? How does it run ?

    With the over heating, it could be bad or it could be something simple as the idler pully on the serpentine belt. more info please.
    I can't really tell if it continues when I rev it, because my stock clutch fan is so damn loud I can't hear anything else. I'll be replacing it this weekend with my e-fans, so I'll be able to get a better listen to the engine while revving it after that fan is gone. It definitely does not get louder, because when I rev it the sound gets drowned out and I can't really hear it anymore.

    A few have commented that overheating could definitely cause knocking - what exactly would be the cause of the knocking as a result of overheating?
    Last edited by jleonard711; 07-06-2007 at 01:21 AM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  8. #8
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    I tried to do some more detective work on this noise today, and here is what I have come up with:

    -it does NOT make the sound when it's cold (well, cold in terms of engine temps, b/c it's already somewhat "hot" at start-up because it's 115 here in Phoenix today)

    - the noise starts after the engine heat up to about 190 degrees.

    -the sound is actually more like "tapping" sound, and it seems to be coming from the lower part of the engine on the passenger side (although it could be the top of the engine, it's hard to tell)

    -as I rev the engine, the sound doesn't get louder but it does get faster. For example, I can hear the noise speed up as I rev it to about 1500rpm, but past that it gets drowned out by the noise of the engine & exhaust.

    Does this info give anybody any ideas as to what this might be??

    Thanks to all you guys in advance for your help...

    James.
    Last edited by jleonard711; 07-07-2007 at 02:00 PM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  9. #9
    Basterdization Specialist mousemotorman's Avatar
    Join Date
    Jun 2007
    Location
    Olympia, Washington
    Age
    51
    Posts
    140

    Re: Knocking noise in 2003 Denali

    Get a long screw driver(place one end on the part your checking and the handle to your ear) or a mechanics stethiscope and check the valve covers and the pan, see where it's coming from.
    No rats just mice
    96 Z-71
    83 S-10 V-8
    06 Hemi Commander

  10. #10
    Registered User
    Join Date
    Jun 2005
    Location
    Outside B'ham
    Posts
    430

    Re: Knocking noise in 2003 Denali

    Main bearings have too much clearance. I just had my 6.0 rebuilt because it had the same sound in the bottom end. I bought it right because of the noise.

    In your case, the oil viscocity got so low that it quit protecting the load bearing surface.

    In my case, a previous owner/mechanic installed a crank kit and did a poor job. When the engine was dis-assembled, there was literally dirt behind some of the bearing shells.
    The inside of the bearing had wear consistant with too little tolerance. Some of the bearings had grooves ground into them from the dirt between the bearing and journal.

    Have you changed the oil yet? A thicker oil will make it a little better. I think you will eventually have to go into the engine to fix the problem.

    Hope that helps.

    Ronnie
    "96 ECSB Totalled 11/06 "99 ECSB K1500 5.3 Base Silverado with 320K miles on the clock "01 GMC CCSB K2500 6.0 153K with 19.5" Michelin Medium Duty Tires "95 Cummins TD 310/751

  11. #11
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    Quote Originally Posted by SteppinLo
    Main bearings have too much clearance. I just had my 6.0 rebuilt because it had the same sound in the bottom end. I bought it right because of the noise.

    In your case, the oil viscocity got so low that it quit protecting the load bearing surface.

    In my case, a previous owner/mechanic installed a crank kit and did a poor job. When the engine was dis-assembled, there was literally dirt behind some of the bearing shells.
    The inside of the bearing had wear consistant with too little tolerance. Some of the bearings had grooves ground into them from the dirt between the bearing and journal.

    Have you changed the oil yet? A thicker oil will make it a little better. I think you will eventually have to go into the engine to fix the problem.

    Hope that helps.

    Ronnie
    Why do you say that my oil viscocity got too low? Would that have to do with the overheating issue I had about a month ago? And wouldn't it make the same noise at a cold start-up if it was an issue with bearing clearance? Or will it only make the noise once my oil heats up & thins out a bit?
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  12. #12
    Registered User
    Join Date
    Jul 2006
    Location
    california
    Posts
    70

    Re: Knocking noise in 2003 Denali

    my Buick turbo used to make no noise till it got up to temperature and then i would get a constant taping from the side of the motor it ended up being a spun bearing and i had to rebuild the motor and get the crank resurfaced.
    Last edited by pugads650; 07-07-2007 at 10:44 PM.

  13. #13
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    How would I be able to narrow it down to a bearing problem without opening up the engine? If I switch to a thicker viscosity oil and it stops the noise, then would that confirm that it's a bearing?

    Also, I am running 5W-30 right now, so do you suggest that I go up to a 10W-30 or 10W-40? Or could I even go up to a 15W-40 since it never drops below 30 degrees on the coldest days here in Phoenix?
    Last edited by jleonard711; 07-08-2007 at 12:42 AM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  14. #14
    Basterdization Specialist mousemotorman's Avatar
    Join Date
    Jun 2007
    Location
    Olympia, Washington
    Age
    51
    Posts
    140

    Re: Knocking noise in 2003 Denali

    Quote Originally Posted by jleonard711
    How would I be able to narrow it down to a bearing problem ?
    10W-40

    Isolate it with a stethiscope, if it's in the pan,it is more than likely a rod bearing or oil pump issue.
    No rats just mice
    96 Z-71
    83 S-10 V-8
    06 Hemi Commander

  15. #15
    Registered User
    Join Date
    Jun 2005
    Location
    Outside B'ham
    Posts
    430

    Re: Knocking noise in 2003 Denali

    The oil is "heavier" when it is cold than when it is hot. The thicker oil "when cold", will take up some of the excess tolerance within any bearing surface. When your motor ran hot, I think the oil got very thin and quit protecting the tight tolerances.

    Fact is, you could change to a thicker oil and maybe quieten some of the noise. Like mousemotorman said, use a stethoscope and isolate the origin of your sound. Locate the exterior main bolts and listen to them.

    You may never diagnose your problem until you open the engine up and visually check until you find something.

    Are you the original owner? If not, you don't know the history of the work done on the truck. A previous owner could have done something that has now caused you a problem.

    I had several reputable mechanics look/listen to my engine. Everyone said "bottom end" but could not be more specific. You might just consider ignoring the noise until it gets worse or you decide to do something with it.

    I hope I am wrong. I hope you will find a belt tensioner or a loose bolt that fixes your noise.

    Good luck and keep us informed.

    Ronne
    "96 ECSB Totalled 11/06 "99 ECSB K1500 5.3 Base Silverado with 320K miles on the clock "01 GMC CCSB K2500 6.0 153K with 19.5" Michelin Medium Duty Tires "95 Cummins TD 310/751

  16. #16
    Registered User turnintires's Avatar
    Join Date
    Nov 2006
    Location
    Vancouver
    Posts
    200

    Re: Knocking noise in 2003 Denali

    Quote Originally Posted by jleonard711
    Why do you say that my oil viscocity got too low? Would that have to do with the overheating issue I had about a month ago? And wouldn't it make the same noise at a cold start-up if it was an issue with bearing clearance? Or will it only make the noise once my oil heats up & thins out a bit?
    like your last statement said, change the oil and put in a little thicker oil and see if that quietens it out
    "GO BIG OR GO HOME"
    C/K's NBS&OBS (too many to list)
    2003 Suburban 1500 soon to be a 2500.(needs front clip ++)

    frame, axles, eng, trans, all together
    body back on with new front clip
    is now driveable!! and almost complete

  17. #17
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    First of all, thanks for all the input from everyone. I'm fairly new to this forum, but so far I'm very impressed with how helpful everyone has been. Forgive me if some of my questions sound like rookie questions, but I've never really done any serious mechanical work getting down into the engine. I've worked on just about every other part of a car or truck, but I've just never had the need to crack open an engine yet so this is new territory for me. I'm trying to learn as much as I can since I'll be installing a Radix kit soon and I want to put it on myself.

    Now back to your regular schedule program - my damn engine noise! I took the advice of many and changed my oil to a thicker viscosity to try and quiet it down a bit, but no luck. I even flushed some SeaFoam through it before the change to help free up any possible sticking lifters, and then put in 10W40 Royal Purple synthetic oil. But after all that, it till makes the exact same sound with the exact same characteristics.

    I decided to take a couple of videos of the truck at idle, and then while revving, so you guys could listen to it and tell me what you think. (the first video is at idle, and the second one is revving between 500-2000 rpms). Notice the faint tapping sound in the background in the first one? As you rev up to about 1000 rpm's it speeds up, and it sounds like a can of BB's rattling around. In the second video, hear how it makes a grinding/rattling sound as the rpms drop back down after revving up? It seems to make that noise from 1500 down to 1000 rpms.

    Anybody have any input after hearing the noise? As I said above, I'm not very familiar with the internals of an engine, so that's why I'm trying to get some feedback from you guys before I decide to try and tackle it myself or take it into a mechanic and pay out the a$$ just to have it looked at.

    Thanks!

    Video #1: http://www.youtube.com/v/uVeNYDsA8eU
    Video #2: http://youtube.com/v/FuFDk4uEipI (it's harder to hear the low-idle tapping sound in this one, but you can hear the griding noise as it comes down from revving. By the way, sorry about the text at the top! My Adobe video editing software is on the fritz, so I had to find some free demo program to convert this to a smaller format so I could put it online)
    Last edited by jleonard711; 07-09-2007 at 11:16 PM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  18. #18
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    Anyone have any other guesses as to what this knocking sound might be after listening to the videos that I posted? As I mentioned above, I already tried a thicker oil and it made no difference (I went from 5W-30 to 10W40, so it's thicker at both startup and operating temps). I also tried an octane booster but it made no difference. Here are the videos again:

    Video #1: http://www.youtube.com/v/uVeNYDsA8eU
    Video #2: http://youtube.com/v/FuFDk4uEipI (it's harder to hear the low-idle tapping sound in this one, but you can hear the griding noise as it comes down from revving. And sorry about the text at the top, my Adobe video editing software is on the fritz so I had to find a free demo program to convert this to a smaller file so I could put it online)
    Last edited by jleonard711; 07-11-2007 at 03:57 PM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  19. #19
    Registered User
    Join Date
    Jul 2006
    Location
    Gilbert, AZ
    Posts
    28

    Re: Knocking noise in 2003 Denali

    Nobody has any other ideas after listening to those video clips??
    Last edited by jleonard711; 07-13-2007 at 09:50 AM.
    ‘03 Denali, Radix S/C (pending install), 160 T-stat, Outlaw Intake, Corsa Exhaust, Belltech 3/2 Drop, E-fans, Beefed-up 4L65E Tranny, B&M Trans Cooler, PowerSlot 14" Rotors w/Hawk HPS Pads, Wester’s Tune, Boss 313 22" Black Chrome wheels, Speed Grilles (upper & lower), Carbon Fiber dash kit.

  20. #20
    GMC RULZZ NEUMANNZZ's Avatar
    Join Date
    Mar 2005
    Location
    San Diego
    Age
    47
    Posts
    19,995

    Re: Knocking noise in 2003 Denali

    Quote Originally Posted by kenman1717
    very common on the denali, the dealership i work at just did like 5 engine rebuilds on 2002-2004 denalis, in the last 2 months, and they all had the same knock.
    what exactly was wrong with them?
    O2 GMC RCSB 4.8L V8 AUTO 3.73's
    rebuilt/beefed up 4L60E(at 43,000miles)
    Matching Ninja 500r


 

 
Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •