Kia Forte: Troubleshooting

Second generation YD (2014-2018) / Kia Forte TD 2014-2018 Service Manual / Suspension System / Troubleshooting

Vehicle inspection

SYMPTOM CHART

Symptom	Suspect Area	Remedy (See page)
Squeak or grunt-noise from the front suspension, occurs more in cold ambient temperatures-more noticeable over rough roads or when turning	Front stabilizer bar	Under these conditions, the noise is acceptable.
Clunk-noise from the front suspension, occurs in and out of turns	Loose front struts or shocks	Inspect for loose nuts or bolts. Tighten to specifications.
Clunk-noise from the rear suspension, occurs when shifting from reverse to drive	Loose rear suspension components	Inspect for loose or damaged rear suspension components. Repair or install new components as necessary.
Click or pop - noise from the front suspension, more noticeable over rough roads or over bumps	Worn or damaged ball joints	Install new lower arm as necessary.
Click or pop - noise occurs when vehicle is turning	Worn or damaged ball joints	Install new lower arm as necessary.
Click or snap - occurs when accelerating around a corner	Damaged or worn Birfield joint	Repair or install a new Birfied joint as necessary. See DS group - driveshaft.
Front suspension noise - A squeak, creak, or rattle noise - occurs mostly over bumps or rough roads	Steering components Loose or bent front struts or shock absorbers Damaged spring or spring mounts Damaged or worn arm bushings Worn or damaged stabilizer bar bushing or links	Go to detailed test A.
Groaning or grinding - noise from the front strut, occurs when driving on bumpy roads or turning the vehicle	Uneven seating surface between the insulator and panel by the burrs around the strut insulator mounting bolts and the insulator boltes mounting holes	Repair or install a new parts as necessary.
Rear suspension noise - a squeak, creak or rattle noise - occurs mostly over bumps or rough roads	Loose or bent rear shock absorbers Damaged spring or spring mounts Damaged or worn control arm bushings	Go to detailed test B.
Shudder - occurs during acceleration from a slow speed or stop	Rear axle assembly mis-positioned Damaged or worn front suspension components	Check the axle mounts and rear suspension for damage or wear. Repair as necessary. Check for a loose stabilizer bar, damaged or loose strut/strut bushings or loose or worn ball joints. Inspect the steering linkage for wear or damage. Repair or Install new components as necessary.
Shimmy - most noticeable on coast/deceleration - also hard steering condition	Excessive positive caster	Check the caster alignment angle. Correct as necessary.
Tire noise - hum/moan at constant speeds	Abnormal wear patterns	Spin the tire and Check for tire wear. Install a new tire as necessary. Inspect for damaged/worn suspension components. Perform wheel alignment.
Tire noise - noise tone lowers as the vehicle speed is lowered	Out-of-balance tire	Balance the tire and road test. Install a new tire as necessary.
Tire noise - ticking noise, change with speed	Nail puncture or stone in tire tread	Inspect the tire. Repair or replace as necessary.
Wheel and tire - vibration and noise concern is directly related to vehicle speed and is not affected by acceleration, coasting or decelerating	Damaged or worn tire	Go to detailed test C.
Tire wobble or shudder - occurs at lower speeds	Damaged wheel bearings	Spin the tire and check for abnormal wheel bearing play or roughness. Adjust or Install new wheel bearings as necessary. See DS group - front/rear axle.
	Damaged wheel	Inspect the wheel for damage. Install a new wheel as necessary.
	Damaged or worn suspension components	Inspect the suspension components for wear or damage. Repair as necessary.
	Loosen wheel nuts	Check the wheel nuts. Tighten to specification.
	Damaged or uneven tire wear	Spin the tire and Check for abnormal tire wear or damage. Install a new tire as necessary.
Tire shimmy or shake - occurs at lower speeds	Wheel/tire out of balance
	Uneven tire wear	Check for abnormal tire wear. Install a new tire as necessary.
	Excessive radial runout of wheel or tire	Perform a radial runout test of the wheel and tire. Install a new tire as necessary.
	Worn or damaged wheel studs or elongate stud holes	Inspect the wheel studs and wheels. Install new components as necessary.
	Excessive lateral runout of the wheel or tire	Perform a lateral runout test of the wheel and tire. Check the wheel, tire and hub. Repair or Install new components as necessary.
	Foreign materal between the brake disc and hub.	Clean the mounting surfaces of the brake disc and hub. See DS group - front/rear axle.
High speed shake or shimmy - occurs at high speeds	Excessive wheel hub runout Damaged or worn tires Damaged or worn wheel bearings Worn or damaged suspension or steering linkage Brake disc or drum imbalance	Go to detailed test D.
Drift left or right	Tires Steering linkage Alignment Base brake system	Go to detailed test E.
Steering wheel	Alignment Steering linkage Front lower arm ball joint	Go to detailed test F.
Tracks incorrectly	Rear suspension Caster	Go to detailed test G.
Rough ride	Front strut and spring assembly Rear shock absorber and spring assembly	Go to detailed test H.
Excessive noise	Front or rear stabilizer bar components Springs Suspension components Shock absorbers	Go to detailed test I.
Incorrect tire wear	Tire or unbalanced wheels Tire inflation Strut Alignment	Go to detailed test J.
Vibration	Wheel/tire Front wheel driveshaft(s) Steering system Strut and spring assembly Spring and strut mounting Front lower arm ball joint Front lower arm mounting bolt bushing Stabilizer bar bushings Wheel hubs and bearing Rear suspension arms and bushings	Go to detailed test K.
Vehicle leans	Tire/wheel Vehicle load Suspension components Incorrect ride height	Inflate tires to specification. Redistribute the load as necessary. Visually inspect the suspention system. Correct the ride height as necessary.
Poor steering returnability	High knuckle rotating torque Alignment	Go to detailed test E.

DETAILED TEST A : FRONT SUSPENSION NOISE

CONDITIONS

DETAILS/RESULTS/ACTIONS

A1. ROAD TEST THE VEHICLE

1.	Test drive the vehicle.

2.	During the road test, drive the vehicle over a rough road. Determine from which area/component the noise is originating. ● Is there a squeak, creak or rattle noise ? → YES Go to A2. → NO The suspension system is OK. Conduct a diagnosis on other suspect systems.

A2. INSPECT THE STEERING SYSTEM

1.	Check the steering system for wear or damage. Perform a steering linkage test. Inspect the tire wear pattern. ● Are the steering components worn or damaged ? → YES Repair the steering system. Install new components as necessary. Test the system for normal operation. → NO Go to A3.

A3. FRONT SHOCK ABSORBER/STRUT CHECK

1.	Check the front shock absorbers/strut mounts for loose bolts or nuts.

2.	Check the front shock absorbers/struts for damage. Perform a shock absorber check. ● Are the front shock absorbers/struts loose or damaged ? → YES Tighten to specifications if loose. Install new front shock absorbers/struts if damaged. Test the system for normal operation. → NO Go to A4.

A4. CHECK THE FRONT SPRINGS

Check the front spring and front spring mounts/brackets for wear or damage

● Are the front springs or spring mounts/brackets worn or damaged ?

→ YES
Repair or Install new components as necessary. Test the system for normal operation.

→ NO
Go to A5.

A5. CHECK THE STABILIZER BAR

1.	Check the stabilizer bar bushings and links for damage or wear.

2.	Check the stabilizer bar for damage.

3.	Check for loose or damaged stabilizer brackets. ● Are the stabilizer bar/track bar components loose, worn or damaged ? → YES Repair or Install new components as necessary. Test the system for normal operation. → NO Suspension system is OK. Conduct diagnosis on other suspect systems.

DETAILED TEST B : REAR SUSPENSION NOISE

CONDITIONS

DETAILS/RESULTS/ACTIONS

B1. ROAD TEST THE VEHICLE

1.	Test drive the vehicle.

2.	During the road test, drive the vehicle over a rough road. Determine from which area/component the noise is originating. ● Is there a squeak, creak or rattle noise ? → YES Go to B2. → NO The suspension system is OK. Conduct a diagnosis on other suspect systems.

B2. REAR SHOCK ABSORBER/STRUT CHECK

1.	Raise and support the vehicle. See GI group - lift support point.

2.	Check the rear shock absorber/strut mounts for loose bolts or nuts.

3.	Check the rear shock absorbers/strut for damage. Perform a shock absorber check. ● Are the rear shock absorbers/struts loose or damaged ? → YES Tighten to specifications if loose. Install new rear shock absorbers/struts if damaged. Test the system for normal operation. → NO Go to B3.

B3. CHECK THE REAR SPRINGS

Check the rear springs and rear spring mounts/brackets for wear or damage.

● Are the rear springs or spring mounts/brackets worn or damaged ?

→ YES
Repair or Install new components as necessary. Test the system for normal operation.

→ NO
Go to B4.

B4. CHECK THE TRAILING ARMS

1.	Inspect the trailing arm bushings for wear or damage. Check for loose trailing arm bolts.

2.	Inspect for twisted or bent trailing arms. ● Are the trailing arms loose, damaged or worn ? → YES Repair or Install new components as necessary. Test the system for normal operation. → NO Suspension system is OK. Conduct diagnosis on other suspect systems.

DETAILED TEST C : WHEEL AND TIRE

CONDITIONS

DETAILS/RESULTS/ACTIONS

C1. ROAD TEST THE VEHICLE

Wheel or tire vibrations felt in the steering wheel are most likely related to the front wheel or tire. Vibration felt through the seat are most likely related to the rear wheel or tire. This may not always be true, but it can help to isolate the problem to the front or rear of the vehicle.

Test drive the vehicle at different speed ranges.

During the road test, if the vibration can be eliminated by placing the vehicle in neutral or is affected by the speed of the engine, the cause is not the wheels or tires.

● Is there a vibration and noise ?

→ YES
Go to C2.

→ NO
The wheel and tires are OK. Conduct a diagnosis on other suspect systems.

C2. CHECK THE FRONT WHEEL BEARINGS

Check the front wheel bearings.
Refer to Wheel Bearing Check (See DS group - front axle).

● Are the wheel bearings OK ?

→ YES
Go to C3.

→ NO
Inspect the wheel bearings. Adjust or Repair as necessary. Test the system for normal operation.

C3. INSPECT THE TIRES

1.	Check the tires for missing weights.

2.	Check the wheels for damage.

3.	Inspect the tire wear pattern. ● Do the tires have an abnormal wear pattern ? → YES Correct the condition that caused the abnormal wear. Install new tire(s). Test the system for normal operation. → NO Go to C4.

C4. TIRE ROTATION DIAGNOSIS

1.	Spin the tires slowly and watch for signs of lateral runout.

2.	Spin the tires slowly and watch for signs of radial runout. ● Are there signs of visual runout ? → YES Go to C5. → NO Check the wheel and tire balance. Correct as necessary. Test the system for normal operation.

C5. RADIAL RUNOUT CHECK ON THE TIRE

Measure the radial runout of the wheel and tire assembly. A typical specification for total radial runout is 1.15mm (0.059 inch).

● Is the radial runout within specifications ?

→ YES
Go to C8.

→ NO
Go to C6.

C6. RADIAL RUNOUT CHECK ON THE WHEEL

Measure the radial runout of the wheel. A typical specification for total radial runout is 1.14mm (0.045 inch.).

● Is the radial runout within specifications ?

→ YES
Install a new tire. Test the system for normal operation.

→ NO
Go to C7.

C7. CHECK THE HUB/BRAKE DISC OR DRUM PILOT RUNOUT OR BOLT CIRCLE RUNOUT

Measure the pilot or bolt circle runout. A typical specification for radial runout is :
● pilot runout - less than 0.15mm (0.006 inch.)
● bolt circle runout - less than 0.38 mm (0.015 inch.)

● Is the radial runout within specification ?

→ YES
Install a new wheel. Test the system for normal operation.

→ NO
Repair or Install new components as necessary.

C8. LATERAL RUNOUT CHECK ON THE TIRE

Measure the lateral runout of the wheel and tire assembly. A typical specification for total lateral runout is 2.5mm (0.098 inch).

● Is the lateral runout within specifications ?

→ YES
Wheel and tires are OK. Conduct diagnosis on other suspect systems.

→ NO
Go to C9.

C9. LATERAL RUNOUT CHECK ON THE WHEEL

Measure the lateral runout of the wheel. A typical specification for total radial runout is 1.2mm (0.047 inch.)

● Is the lateral runout within specifications ?

→ YES
Install a new tire. Test the system for normal operation.

→ NO
Go to C10.

C10. CHECK THE FLANGE FACE LATERAL RUNOUT

Measure the flange face lateral runout. A typical specification for lateral runout is :
● hub/brake disc - less than 0.13mm (0.005 inch)

● Is the lateral runout within specifications ?

→ YES
Install a new wheel. Test the system for normal operation.

→ NO
Repair or Install new components as necessary.

DETAILED TEST D :

CONDITIONS

DETAILS/RESULTS/ACTIONS

D1. CHECK FOR FRONT WHEEL BEARING ROUGHNESS

1.	Raise and support the front end of the vehicle so that the front wheel and tire assemblies can spin. See GI group - lift support point.

2.	Spin the front tires by hand. ● Do the wheel bearings feel rough ? → YES Inspect the wheel bearings. Repair as necessary. Test the system for normal operation. → NO Go to D2.

D2. CHECK THE END PLAY OF THE FRONT WHEEL BEARINGS

Check the end play of the front wheel bearings.

● Is the end play OK ?

→ YES
Go to D3.

→ NO
Adjust or Repair as necessary. Test the system for normal operation.

D3. 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 detailed test C.

● Are the measurements within specifications ?

→ YES
Go to D4.

→ NO
Install new wheels as necessary and Balance the assembly. Test the system for normal operation.

D4. MEASURE THE LATERAL RUNOUT OF THE FRONT TIRES ON THE VEHICLE

Measure the lateral runout of the front tires on the vehicle. Go to detailed test C.

● Is the runout within specifications ?

→ YES
Go to D5.

→ NO
Install new tires as necessary and Balance the assembly. Test the system for normal operation.

D5. MEASURE THE RADIAL RUNOUT OF THE FRONT TIRES ON THE VEHICLE

Measure the radial runout of the front tires on the vehicle. Go to detailed test C.

● Is the runout within specifications ?

→ YES
Balance the front wheel and tire assemblies. If any tire cannot be balanced, Install a new tire. Test the system for normal operation.

→ NO
Go to D6.

D6. 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 ?

→ YES
Balance the assembly. Test the system for normal operation.

→ NO
If the high spot is not within 101.6mm (4 inches) of the first high spot on the tire, Go to D7.

D7. MEASURE THE WHEEL FLANGE RUNOUT

Dismount the tire and mount the wheel on a wheel balancer. Measure the runout on both wheel flanges. Go to detailed test C

● Is the runout within specifications ?

→ 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 D8.

→ 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 D8.

D8. CHECK FOR VIBRATION FROM THE FRONT OF THE VEHICLE

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 ?

→ YES
Substitute known good wheel and tire assemblies as necessary.
Test the system for normal operation.

→ NO
Check the driveline components. Test the system for normal operation.

DETAILED TEST E : DRIFT LEFT OR RIGHT

CONDITIONS

DETAILS/RESULTS/ACTIONS

E1. CHECK THE TIRES

Inspect the tires for excessive wear or damage.

● Are the tires excessively worn or damaged ?

→ YES
Install new tires.

→ NO
Go to E2.

E2. CHECK THE STEERING LINKAGE

1.	Raise and support the vehicle.

2.	Check the steering components for indications of excessive wear or damage. See ST group - specification. ● Is there an indication of excessive wear or damage ? → YES Repair or Install new components as necessary. → NO Go to E3.

E3. CHECK THE VEHICLE ALIGNMENT

Special Service Tools

Tool Name / Number Illustration Description Strut spring compressor 09546-26000 Compression of coli spring ...

Front Suspension System

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Kia Forte: Troubleshooting

Special Service Tools

Front Suspension System

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