2002 Chevrolet Trailblazer jerky on bumpy roads

Tiny
ARIESS
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 250,000 MILES
I am feeling little jerks on bumpy road. I showed to mechanic, but he could not find the exact cause as shocks are good. What can be the actual cause? Can anyone suggest please?
Do you
have the same problem?
Yes
No
Monday, December 8th, 2014 AT 10:55 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
Shock absorbers are the last thing to suspect. Have the vehicle inspected at a tire and alignment shop. They specialize in finding the causes of handling problems and noises. The smaller Blazers have a real big problem with repeat failure of the upper ball joints. I have not seen one separate yet leading to loss of control or crashes, but it is real common for them to make clunking noises and to allow a wheel to shift position while driving. Shifting position changes the alignment which can result in intermittent pulling to one side, shifting steering wheel position, and darting slightly from side to side.

A lot of manufacturers have been having trouble with worn control arm bushings too for about the last dozen or so years. That will also allow a wheel to shift its position. Anything that allows a wheel to shift will cause a variety of handling problems. Shock absorbers aren't involved in that. They just reduce a wheel's tendency to keep bouncing after it hits a bump.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2014 AT 11:26 PM
Tiny
ARIESS
  • MEMBER
One of the mechanic said that I should change the upper and lower ball joint on both side. Will it cure the problem I am having, i.E; feeling like front tyres are fee moving up and down on bumpy road. It seems that on bumpy road; nothing is there to keep the front tyres stop moving the tyres up and down and in results it produces constant up down jerks.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2014 AT 11:34 PM
Tiny
CARADIODOC
  • EXPERT
You have to go by your mechanic's observations and recommendations. I'm a specialist in suspension and alignment, but I have to be able to see movement when I poke and pry on parts to tell if they're worn or a safety issue. Over a computer I can only go by what you describe and the corresponding typical solutions. Based on my past experience with upper ball joints on Blazers, at the mileage you listed, and the vehicle's age, they should have been replaced multiple times already. It was necessary to replace them on two former coworkers' Blazers every two years, but I think mileage is a better predictor than age.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2014 AT 11:45 PM
Tiny
ARIESS
  • MEMBER
Very right. I agree 100%.
Was this
answer
helpful?
Yes
No
Tuesday, December 9th, 2014 AT 12:09 AM

Please login or register to post a reply.

Recommended Guides