Trouble Diagnosis And Testing; Tires Wearing Uneven Or Scuffing; Tires Cupping; Front Wheel Shimmy At Low Speeds - Pontiac FIREBIRD 1972 Service Manual

3-2 1972 PONTIAC SERVICE MANUAL
TROUBLE DIAGNOSIS A N D TESTING
TIRES WEARING UNEVEN OR SCUFFING
Follow steps below. If first step is O.K., proceed down list until problem
is corrected.
CAUSE
a. Tires improperly inflated.
b. Excessive speed on turns.
c. Excessive wheel or tire run-out.
d. Toe-in incorrect.
e. Uneven camber.
f. Incorrect toe-out on turns.
g. Control arm or steering knuckle bent.
CORRECTION
a. Inflate tires to recommended pressure.
b. Caution driver.
c. Check wheels and tires for wobble and
proper mounting.
d. Adjust toe-in as required.
e. Check camber and adjust as necessary.
f. Steering linkage is bent and damaged part
must be replaced.
g. Inspect bushings, control arm or steering knuckle.
Bent and damaged parts must be replaced.
TIRES CUPPING
Follow steps below. If first step is O.K., proceed down list until problem
is corrected.
CAUSE CORRECTION
a. Tires improperly inflated. a. Inflate tires to recommended pressure.
b. Excessive mileage without rotating tires.
b. Rotate tires every 6,000 miles.
c. Wheel bearings incorrectly adjusted or worn. c. Adjust or replace parts as necessary.
d. Uneven camber.
d. Check camber and adjust as necessary.
e. Toe-in incorrect. e. Adjust toe-in as required.
f. Tires out of balance f. Balance wheel and tire assemblies
FRONT WHEEL S H I M M Y AT LOW SPEEDS
Follow steps below. If first step is O.K., proceed down list until problem
is corrected.
CAUSE
a. Low or uneven tire pressure.
b. Eccentric or bulged tires.
c. Excessive wheel or tire run-out.
d. Front wheel bearings incorrectly adjusted
or worn.
e. Stabilizer shaft inoperative.
f. Steering linkage incorrectly adjusted or
worn.
g. Steering gear incorrectly adjusted.
h. Incorrect or uneven caster.
i. Toe-in incorrect.
j. Steering knuckle bent or control arm bushing
loose or bent.
CORRECTION
a. Inflate tires to recommended pressure.
b. Replace tires as necessary.
c. Check wheels and tires for wobble, radial
run-out and proper mounting.
d. Adjust or replace bearings as necessary.
e. Inspect bushings and links and replace worn
parts. ,
f. Adjust or install new parts as necessary.
g. Adjust steering gear.
h. Check and adjust caster as necessary.
i. Adjust toe-in as required.
j. Inspect bushings, control arm or steering knuckle.
Bent and damaged parts must be replaced.