60-80 mph vibration fades in and out - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Brakes, Suspension, Wheels and Tires > OEM Issues

OEM Issues OEM Repairs & Problems

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  #1  
Old 03-05-2010, 08:58 AM
jswineaiv jswineaiv is offline
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60-80 mph vibration fades in and out

Ok here I go. I have a 04 Trailblazer with 4x4 I6. The Tires less than a year old and the last time I had them balanced was over the summer. My problem is once I hit around 60 mph it starts this slow vibration that fades away and comes back consistant. Now as I reach up to 80 mph it speeds up the fade in and out vibration. Once I pass 80mph it stops. At a constant speed between 60 and 80 it does this. I tried the shifting in neutral to see if I still get the vibration between those speeds and I still do as well as letting my foot of the gas. Now I feel it in the floor boards and gas pedal. Other than it being the tires needing to be rebalanced, does anyone have any ideas what it is? I know I had this vibration before in a 97 blazer due to a loose u-joint but that was constant vibration rather than a fadeing one. Plus I checked the u-joints and they felt snug. One last thing, I tried the shifting in neutral a second time but starting above 80. It was fine but once it hit less than 80 it started the vibration agian. Going on a long roadtrip to Tennessee in September for a honeymoon and I dont was this while we are driving down.
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  #2  
Old 03-05-2010, 09:19 AM
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andrerwd andrerwd is offline
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Quote:
Originally Posted by jswineaiv View Post
Ok here I go. I have a 04 Trailblazer with 4x4 I6. The Tires less than a year old and the last time I had them balanced was over the summer. My problem is once I hit around 60 mph it starts this slow vibration that fades away and comes back consistant. Now as I reach up to 80 mph it speeds up the fade in and out vibration. Once I pass 80mph it stops. At a constant speed between 60 and 80 it does this. I tried the shifting in neutral to see if I still get the vibration between those speeds and I still do as well as letting my foot of the gas. Now I feel it in the floor boards and gas pedal. Other than it being the tires needing to be rebalanced, does anyone have any ideas what it is? I know I had this vibration before in a 97 blazer due to a loose u-joint but that was constant vibration rather than a fadeing one. Plus I checked the u-joints and they felt snug. One last thing, I tried the shifting in neutral a second time but starting above 80. It was fine but once it hit less than 80 it started the vibration agian. Going on a long roadtrip to Tennessee in September for a honeymoon and I dont was this while we are driving down.
You've already stated the first step of the troubleshooting process. Have the tires balanced and drive it to see if goes away. I had my new Dura Tracs on for 2 months and they were out of balance. Start at the cheapest and easiest first.
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  #3  
Old 03-05-2010, 09:45 AM
GusMan GusMan is offline
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Also look for any defects in the tires like the sidewall bulging out. That happened to us a couple of years ago. Got new tires and because we do mostly "city" driving under 50MPH, we never realized the issue till we got on the highway a month later.

We always had good luck by taking our cars to Sams for rotate and balance. Its like $16.
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Old 03-05-2010, 10:07 AM
jswineaiv jswineaiv is offline
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Thanks for the Tip with sams club. I will be heading there this weekend. There is no way i want to pay $40 to have my tires balanced. Ill see how it goes this weekend.
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Old 03-05-2010, 11:31 AM
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LMMJ LMMJ is offline
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Have you or anyone used fix-a-flat type stuff? We've had a couple where be would spin balance and add the necessary weights and re-spin to verify. We would then get a different weight reading everytime we adjusted. At some point in time the wheel spun around slow enough for us to hear water sloshing around inside it. I released some air thru the valve stem and sure enough we smelled fix a flat.
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Old 03-05-2010, 11:35 AM
wiltface wiltface is offline
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i would check ball joints and tie rod ends as well. thats something you can do urself.
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Old 03-05-2010, 12:25 PM
jswineaiv jswineaiv is offline
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I never use fix-a-flat stuff. It may be helpful at the moment but in the long run you have more problems. Thats what the spare is for till you get thetire patch correctly.
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Old 03-10-2010, 08:56 AM
jswineaiv jswineaiv is offline
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Tires balanced, still vibration

Ok so I got the tires balanced finaly at Sams club. The frount ones took a lot of weight to balance out the tires but the back ones were fine. He rotated the tires as well. I some times seem to notice the car vibration shake around 70 mph. That was not problem in the first place I was talking about. I still feel the vibration I first posted about. To be a little more clear about the fading in and out vibration, it is more like a grinding vibration opposed to a shaky car vibration. Now that the tires are balance rotated. What are some other ideas that this could be? I have about 1500 miles left on the warrenty that sucks. I want to eleminate any possibilty of it being a part the warrenty will not cover.
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Old 03-10-2010, 09:51 AM
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guano2 guano2 is offline
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Get under there & check for wobble (inboard bearings), your CV axles.....

I've had a rearview mirror, seat of the pants vibration as long as I recall with my TB, ( tires, wheel bearings didn't change things, 72to80 speed range, speed range has finally gotten wider & I AM going to find the cause! ( Finally paid off, so now it's my problem) I'm at 90th now an due to service, replace a lot of stuff frt & rr shortly now that weather is improving....GL ............................. P.S. haven't found anyone directly state they solved this one yet, over the years.
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Old 03-10-2010, 11:04 AM
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LMMJ LMMJ is offline
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Quote:
Originally Posted by jswineaiv View Post
Ok so I got the tires balanced finaly at Sams club. The frount ones took a lot of weight to balance out the tires but the back ones were fine. He rotated the tires as well. I some times seem to notice the car vibration shake around 70 mph. That was not problem in the first place I was talking about. I still feel the vibration I first posted about. To be a little more clear about the fading in and out vibration, it is more like a grinding vibration opposed to a shaky car vibration. Now that the tires are balance rotated. What are some other ideas that this could be? I have about 1500 miles left on the warrenty that sucks. I want to eleminate any possibilty of it being a part the warrenty will not cover.
Sounds like bad wheel sbearing/s. Is it kinda like a hummmmmmmmmmmm? Mine started on the passanger side and gradually dissapeared for a month and came back with a vengeance. It brought the left side for backup too
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