Interested in the outcome here.
Jackhammer sounds from under front end and other horrible noises - 2008 Yukon Denali
- Thread starter Gildan
- Start date
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my money is on the u joints
Martins denali
TYF Newbie
- Joined
- Dec 13, 2014
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- 13
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Air Ride Suspension Compressor Pump
Mine went out and sounded like a jackhammer one minute and would run fine for a week or two and then do it again
Except the compressor is in the rear and his sound is coming from the front.
You didn't specifically mention pulling a wheel and checking the brakes. But an intermittently sticking caliper hitting a severely worn rotor could make the noises you're describing.
gooffeyguy
Tom
My vote is on the AC compressor
Martins denali
TYF Newbie
- Joined
- Dec 13, 2014
- Posts
- 13
- Reaction score
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Driving down the road it sounded like it was coming from the front
I thought you said the ac belt was off? or was the ac just turned off?
swathdiver
Full Access Member
A few years ago someone on here was having ABS pump issues and I came across some youtube videos of them making those hideous noises. Scary, like when a torque converter bolt gets loose and you think the motor has a rod knock!
I had the entire truck gone over by a GMC dealer an they can't find a blessed thing wrong with it. The front stabilizer bar links were bad (bushings gone). Replaced them and the problem got worse. U Joints OK, the crossmember is ok. Transmission and transaxle OK. No problem can be found.
The banging is getting even louder. After replacing the bar links and the mounts and checking the crossmember for looseness; checking the drive line for bad U joints, and everything else the mechanics can thing of, the issue is getting worse.
After I replaced the links on the bar (the old ones were flopping loose) I got a repeated banging noise on backing out of my driveway and then a minute later as I drove off down the road. The banging was loud enough to echo off the trees in the woods. Just like someone was hitting the underside of the Yukon with a hammer. Then it stopped.
I drove about 12 miles to my horse barn, parked the Yukon for about 30 minutes to feed the horses. On backing up, BANG BANG BANG!. Then it stopped. Then it was BANDG< BANG BANG down the driveway until I got on the road. There was a brief scraping noise this time when I turned to the right (it was always on the left) and the problem stopped. The problem always starts on the straight on a smooth road only. If, upon the banging I throw the vehicle into neutral, the banging continues. No feedback through the steering wheel or any change in vehicle performance. Just a nasty, loud (and I mean nasty LOUD) banging and you can feel through the floor of the vehicle.
Again, U Joints are fine, Everything in the front end is tight and at specs, Driveline and everything else are fine. The only thing is that the problem is got very much worse and more persistent after I replaced the stabilizer bar links. It sounds like something is about to break. And I am at wits end trying to figure this one out. The dealership is totally stumped.
The banging is getting even louder. After replacing the bar links and the mounts and checking the crossmember for looseness; checking the drive line for bad U joints, and everything else the mechanics can thing of, the issue is getting worse.
After I replaced the links on the bar (the old ones were flopping loose) I got a repeated banging noise on backing out of my driveway and then a minute later as I drove off down the road. The banging was loud enough to echo off the trees in the woods. Just like someone was hitting the underside of the Yukon with a hammer. Then it stopped.
I drove about 12 miles to my horse barn, parked the Yukon for about 30 minutes to feed the horses. On backing up, BANG BANG BANG!. Then it stopped. Then it was BANDG< BANG BANG down the driveway until I got on the road. There was a brief scraping noise this time when I turned to the right (it was always on the left) and the problem stopped. The problem always starts on the straight on a smooth road only. If, upon the banging I throw the vehicle into neutral, the banging continues. No feedback through the steering wheel or any change in vehicle performance. Just a nasty, loud (and I mean nasty LOUD) banging and you can feel through the floor of the vehicle.
Again, U Joints are fine, Everything in the front end is tight and at specs, Driveline and everything else are fine. The only thing is that the problem is got very much worse and more persistent after I replaced the stabilizer bar links. It sounds like something is about to break. And I am at wits end trying to figure this one out. The dealership is totally stumped.
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