Engine knock

30

Asked by Mar 22, 2017 at 10:54 AM about the 2011 Chevrolet Traverse LS FWD

Question type: Maintenance & Repair

2011 Chevy Traverse LS 3.6 V6 44000
miles. Out of the blue I heard a light
constant ticking noise while driving. Next
day I started the car to warm it up before I
put my kids in and could still hear a light
tick. As soon as I started driving the tick
turned into a full blown knock. I turned
around and brought it back home. No
trouble codes have come up. I brought it to
one mechanic who immediately said "rod
knock, get rid of it" just by sound alone.
Second mechanic thought maybe rod
knock and wanted to drop the oil pan to
verify. Well to get to the oil pan on this car,
you have to pull the transmission and a
bunch of other stuff. So basically he would
have to pull the whole front end off from
the bottom to even diagnose the issue. We
are out of all warranties, and even
diagnosing would be extremely expensive.
Basically he wanted us to have a
replacement engine ready to go because
of the labor involved to even find the issue.
We decided to sit on it for now. I've been
searching around and I have found that
there's a slight possibility that our noise
could be coming from the intake manifold.
Maybe the flappers are loose or broken
and are banging around in there. I'm pretty
handy, so I'd like to try a couple things
before I junk this car that I still owe on. My
question: Is there a way to disable the
intake manifold while on the engine to see
if it changes the noise? It seems pretty
straightforward removing it and even
swapping it with a new one, but I'd like to
be able to actually diagnose the issue first.
I am also planning on pulling the power to
each cylinder to see if the noise changes
as well. Also, like I said, no engine lights
are on, and the car drives fine. No loss of
power, as far as I can tell no oil pressure
drop, etc. it just sounds like it's going to
explode.

13 Answers

67,995

Kill the power to cylinders one by one and if the knock gets noticeably quieter a rod bearing is the likely cause. My guess is you mechanic is correct. Has anyone bothered to check the oil level in the engine?

30

Yes, I plan on doing that as well. I didn't mention that oil level is fine, I always change my oil and filter when I should. As a matter of fact, I got an oil change maybe 300 miles prior to the knock. When the mechanic pulled out the oil he did not see and obvious metal shavings or anything. I'm going to check the oil filter myself as well.

67,995

A spun rod bearing may not put lots of metal into the oil.

30

Thanks, good to know. I think my chances of spinning a rod bearing are on the low end, since I have so little miles on the car, I've never beat on it, have always kept up on maintence, never let get low on oil. Could it be a spun rod? Sure. Could it be something else? Maybe. I just want to find out for sure myself. I can't drop the oil pan, or tear apart the engine myself, so I'm looking for other ways to diagnose. All I want to know is if there's a way to stop the intake manifold from opening and closing the flappers while the car is on to see if I can get a change in the sound. I found a gm service manual somewhere online for my car that said when someone brings in this car with a rod knock sound to first replace intake manifold, if that doesn't work, proceed to tearing apart engine.

38,025

Bob gave you a good suggestion, pull a plug wire one-by-one, and see if knock changes. It will not only let you know if it is indeed rod knock it will let you which cylinder is the guilty culprit. I would also look for an exhaust leak, pull valve covers and listen to valve train - you can also determine if it is lower end related or valve train related by determining if knock is equal to engine RPM (lower end related) or one-half engine RPM (camshaft/valve train). BTW there are a lot of complaints about the high-pressure fuel pump being a source for a ticking noise, and that is driven by the cam, so again if the tick is at half engine RPM, that might be a source for your noise. This engine being direct fuel injection, I think you would be better off taking it to a GM tech and not a neighborhood mechanic, they might be more familiar with the noises common with this engine.

30

Thank you for the insight! I'll be digging in this weekend. Hoping I get some answers before I decide to just drive it off a cliff

67,995

Please post what you find during your investigation of the knock.

30

Will do. Found an interesting tidbit that I'm going to look into as well: the DI systems can cause major carbon buildup in the back of the valve stems since there's no fuel to wash over them and keep them clean. I pulled off my air filter yesterday because I had a minute to take a peak. My pcv port was pretty full of oil and the air intake tube was pretty saturated too. The throttle body was also coated with oil. Known issue from what I've read. I'm thinking about getting a bottle of sea foam and spraying it in the throttle body to try to clean up the valve stems. I only drive the car for short trips so maybe carbon buildup is a possibility.

1 people found this helpful.
30

It's a rod. Thanks for the help guys. So if anyone wants to buy a 2011 Chevy Traverse that's going to need a new engine, but otherwise is in great shape.... I have one available. I don't have the cash to put in a new engine at the moment, but someone could make a good profit if they have the time, money and space.

2 people found this helpful.

GuruDS2V Im having the same issues with my 2009. Any chance you could email me so I could ask you some questions eastendsillest@gmail.com. I need help on what time do.

30

Sorry to hear you're having the same issue. The way the Traverse was built, the entire front end needs to be removed to even get in there and confirm it's a rod. Which costs a pretty penny, especially if you're not planning on fixing it. I opted to sell mine as is and try to forget I ever owned it. If you want to keep it, look at Ebay for new engines. I think I was quoted around $4000 for the engine and the install. Hope that helps

Is the 2011 traverse still for sale and how much?? Get with me 517 four88 eight518

I have 2010 Chevy Traverse ..I was on the interstate heard small ticking sound coming from under my hood as i drove the worse it got so i got off the interstate & the whole car lock up on me . So i sit for second it finally started back & it had very little power and a very loud sound coming from under the hood ...Ive got oil in it , water so not sure what it could be so please help me ...Cant afford whole new motor :(

Your Answer:

Traverse

Looking for a Used Traverse in your area?

CarGurus has 1,210 nationwide Traverse listings starting at $4,900.

Postal Code:

Chevrolet Traverse Experts

  • #1
    Rowefast
    Reputation
    250
  • #2
    Mike Bonnell
    Reputation
    170
  • #3
    Js08016
    Reputation
    100
View All

Related Models For Sale

Used GMC Acadia
36 Great Deals out of 1,710 listings starting at $3,995
Used Chevrolet Tahoe
10 Great Deals out of 778 listings starting at $5,900
Used Chevrolet Equinox
70 Great Deals out of 4,635 listings starting at $4,888
Used Ford Explorer
22 Great Deals out of 1,756 listings starting at $2,700
Used Buick Enclave
16 Great Deals out of 1,483 listings starting at $4,877
Used Toyota Highlander
17 Great Deals out of 1,234 listings starting at $4,910
Used Dodge Durango
27 Great Deals out of 1,107 listings starting at $2,400
Used Honda Pilot
12 Great Deals out of 794 listings starting at $2,740
Used GMC Terrain
48 Great Deals out of 3,111 listings starting at $1,240
Used Kia Sorento
55 Great Deals out of 2,609 listings starting at $798
Used Jeep Grand Cherokee
63 Great Deals out of 5,329 listings starting at $1,900
Used Nissan Pathfinder
29 Great Deals out of 1,117 listings starting at $2,980
Used Chevrolet Suburban
13 Great Deals out of 454 listings starting at $4,988
Used GMC Yukon
24 Great Deals out of 1,046 listings starting at $3,995
Used Chevrolet Silverado 1500
99 Great Deals out of 11,128 listings starting at $4,950

Used Cars For Sale

2018 Chevrolet Traverse LS FWD For Sale
33 listings starting at $35,540
2017 Chevrolet Traverse LS FWD For Sale
3 listings starting at $21,200
2016 Chevrolet Traverse LS FWD For Sale
2 listings starting at $21,500
2015 Chevrolet Traverse LS FWD For Sale
11 listings starting at $18,495
2014 Chevrolet Traverse LS FWD For Sale
5 listings starting at $16,498

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.