Chevrolet Sonic Repair Manual: Tire and Wheel Balancing (Road Force Variation (RFV))
- ALL wheel/tire assemblies must have a RFV within spec before being mounted on vehicle.
- RFV is unrelated to tire balance.
- RFV is identifying the stiff portion of the tire and determining if it is within spec.
- If RFV is too high, it will result in a vibration condition.
- Do not attempt to measure RFV on tires that have temporary flat spots. If necessary, drive the vehicle to relieve the flat spots.
- Prior to measuring for RFV, the tires must be inflated to the specification on the label.
- Passenger Cars (including Crossover Vehicles) = 18 lbs.
- Truck Tires: (P) - metric = 24 lbs.
(LT) - metric = 35 lbs.
- It is recommended that RFV measurements are made prior to installation of balance weights. Once adequate road force levels have been achieved, move on to balance the assembly.
Important:
If a wheel/tire assembly is not within the RFV specification after match mounting, the tire must be returned to the tire manufacturer. DO NOT install tire/wheel assembly on a vehicle if it exceeds the RFV specification.
Tire and Wheel Balancing (Collet Cone Selection)
Important: Never use the hub cap bore to center the wheel onto
the balancer. The pilot bore (on the hub side of the wheel) is machined
to be concentric to very tight non - standard tole ...
Tire and Wheel Balancing (Wheel Pilot Bore Greasing)
Beginning with MY 2011 vehicle, pilot bore grease should be applied.
To enable this, grease must be applied to the pilot bore to prevent the
wheel from seizing onto the hub.
Refer to Adhesi ...
Other materials:
System Operation
The vehicle has a Traction Control System (TCS) and StabiliTrak®, an electronic
stability control system. These systems help limit wheel slip and assist the driver
in maintaining control, especially on slippery road conditions.
TCS activates if it senses that any of the drive wheels are spinni ...
Tires and Wheels Description and Operation
There are two types of tire and wheel balancing: static and dynamic.
Static balance is the equal distribution of weight around the wheel. Assemblies
that are statically unbalanced cause a bouncing action called wheel tramp. This
condition may eventually cause uneven tire wear.
...
Intake Manifold Disassemble
Remove the fuel injection rail ground cable nut (1).
Remove the 2 fuel injection rail bolts (2).
Remove the fuel injection fuel rail assembly (3).
Remove the intake manifold gasket (4).
Remove the 2 manifold absolute pressure sensor bolts ...
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