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Pinpoint Test K: High Speed Shake Or Shimmy

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 CHECK FOR FRONT WHEEL BEARING ROUGHNESS 
    • Chock the rear wheels.
    • Raise and support the front end of the vehicle so that the front wheel and tire assemblies can spin.
    • Spin the front tires by hand. Refer to WHEEL BEARING CHECK  .
    • Do the wheel bearings feel rough? 
    1. Yes  : INSPECT the wheel bearings. REPAIR as necessary. TEST the system for normal operation.
    2. No  : GO to K2.
  2. K2 CHECK THE END PLAY OF THE FRONT WHEEL BEARINGS 
    1. Yes  : GO to K3.
    2. No  : ADJUST or REPAIR as necessary. TEST the system for normal operation.
  3. K3 MEASURE THE LATERAL RUNOUT AND THE RADIAL RUNOUT OF THE FRONT WHEELS ON THE VEHICLE 
    • Measure the lateral runout and the radial runout of the front wheels on the vehicle. Go To PINPOINT TEST J: WHEEL AND TIRE 
    • Are the measurements within specifications? 
    1. Yes  : GO to K4.
    2. No  : INSTALL new wheels as necessary and BALANCE the assembly. TEST the system for normal operation.
  4. K4 MEASURE THE LATERAL RUNOUT OF THE FRONT TIRES ON THE VEHICLE 
    • Measure the lateral runout of the front tires on the vehicle. REFER To Pinpoint Test J.
    • Is the runout within specifications? 
    1. Yes  : GO to K5.
    2. No  : INSTALL new tires as necessary and BALANCE the assembly. TEST the system for normal operation.
  5. K5 MEASURE THE RADIAL RUNOUT OF THE FRONT TIRES ON THE VEHICLE 
    1. Yes  : BALANCE the front wheel and tire assemblies. If any tire cannot be balanced, INSTALL a new tire. TEST the system for normal operation.
    2. No  : GO to K6.
  6. K6 MATCH MOUNT THE TIRE AND WHEEL ASSEMBLY 
    • Mark the high runout location on the tire and also on the wheel. Break the assembly down and rotate the tire 180 degrees (halfway around) on the wheel. Inflate the tire and measure the radial runout.
    • Is the runout within specifications? 
    1. Yes  : BALANCE the assembly. TEST the system for normal operation.
    2. No  : If the high spot is not within 101.6 mm (4 inches) of the first high spot on the tire, GO to K7.
  7. K7 MEASURE THE WHEEL FLANGE RUNOUT 
    • Dismount the tire and mount the wheel on a wheel balancer. Measure the runout on both wheel flanges. Refer to WHEELS & TIRES article.
      Fig 1: Measuring Runout On Both Wheel Flanges
      G03272053Courtesy of FORD MOTOR CO.
    • Is the runout within specifications? 
    1. Yes  : LOCATE and MARK the low spot on the wheel. INSTALL the tire, matching the high spot on the tire with the low spot on the wheel. BALANCE the assembly. TEST the system for normal operation. If the condition persists, GO to K8.
    2. No  : INSTALL a new wheel. CHECK the runout on the new wheel. If the new wheel is within limits, LOCATE and MARK the low spot. INSTALL the tire, matching the high spot on the tire with the low spot on the wheel. BALANCE the assembly. TEST the system for normal operation. If the condition persists, GO to K8.
  8. K8 CHECK FOR VIBRATION FROM THE FRONT OF THE VEHICLE 
    WARNING: If only one drive wheel is allowed to rotate, speed must be limited to 55 km/h (34 mph) using the speedometer reading, since actual wheel speed will be twice that indicated on the speedometer. Exceeding a speed of 55 km/h (34 mph) or allowing the drive wheel to hang unsupported can result in tire disintegration or differential failure, which can cause serious personal injury and extensive vehicle damage.
    • Spin the front wheel and tire assemblies with a wheel balancer while the vehicle is raised on a hoist. Feel for vibration in the front fender or while seated in the vehicle.
    • Is the vibration present? 
    1. Yes  : SUBSTITUTE known good wheel and tire assemblies as necessary. TEST the system for normal operation.
    2. No  : GO to K9.
  9. K9 CHECK FOR VIBRATION FROM THE REAR OF THE VEHICLE 
    WARNING: If only one drive wheel is allowed to rotate, speed must be limited to 55 km/h (34 mph) using the speedometer reading, since actual wheel speed will be twice that indicated on the speedometer. Exceeding a speed of 55 km/h (34 mph) or allowing the drive wheel to hang unsupported can result in tire disintegration or differential failure, which can cause serious personal injury and extensive vehicle damage.
    • Chock the front wheels.
    • Raise and support the rear end of the vehicle so that the rear wheel and tire assemblies can spin.
    • Engage the drivetrain and carefully accelerate the drive wheels while checking for vibration.
    • Is the vibration present? 
    1. Yes  : GO to K10.
    2. No  : TEST the system for normal operation.
  10. K10 CHECK THE DRIVETRAIN 
    WARNING: If only one drive wheel is allowed to rotate, speed must be limited to 55 km/h (34 mph) using the speedometer reading, since actual wheel speed will be twice that indicated on the speedometer. Exceeding a speed of 55 km/h (34 mph) or allowing the drive wheel to hang unsupported can result in tire disintegration or differential failure, which can cause serious personal injury and extensive vehicle damage.
    • Remove the rear wheel and tire assemblies. Refer to WHEELS & TIRES article.
    • Secure the brake drums (if so equipped), by installing wheel hub bolt nuts, reversed.
    • Carefully accelerate the drivetrain while checking for vibration.
    • Is the vibration present? 
    1. Yes  : CHECK/TEST the drivetrain and driveline components. TEST the system for normal operation.
    2. No  : SUBSTITUTE known good wheel and tire assemblies as necessary. TEST the system for normal operation.
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