F 150 Heritage 4WD Pickup V8-5.4L CNG VIN M (2004)
NOTE
WHEN EVALUATING THE CONDITION IT IS RECOMMENDED THAT THE VEHICLE BE OPERATED ON A FLAT
SMOOTH-SURFACED ROAD THAT HAS MINIMAL OR PREFERABLY NO EXPANSION JOINTS, SUCH AS ASPHALT. ROUGH ROAD
SURFACES MAY MASK THE CONDITION OR GIVE A FALSE FEELING OF VIBRATION.
SERVICE PROCEDURE (Refer To Figure 1)
FIRST ORDER TIRE/WHEEL DIAGNOSTIC PROCEDURE 10-12 HZ, 88-105 KM/H (55-65 MPH)
NOTE
FOR 4X2 VEHICLES GO DIRECTLY TO STEP 2.
1.
Check the integrated wheel end (WE) on 4X4 units. Raise the front of the vehicle (wheels off the ground), engine running, vehicle in 2WD mode.
The front half shafts should not turn when wheels are rotated by hand. If the IWE is functioning correctly proceed to Step 2. If not, refer to the
Workshop Manual Section 308-07 to repair IWE first. Then proceed to Step 2.
2.
If road force measurement equipment (Hunter G5P9700/9712, or equivalent) is available, proceed to Step 3. If not. mark the original fire/wheel
location on each tire. (i.e. LF. LR, RF, RR) and remove from the vehicle. Check wheel balance, and rebalance as required to achieve less than 0.25
oz. (7g) of imbalance. Reinstall wheels and road test vehicle. If the condition is corrected return the vehicle to the customer. If not, proceed to Step
5.
3.
If road force measurement equipment available (Hunter G5P9700/971 2, or equivalent), measure the tire road force variation on all four (4) tires,
following the manufacturer's instructions and TSB 03-20-8. If any wheel assembly measures more than the values listed below for R1H or R2H
then proceed to Step 4. If not proceed to Step 5.
Tire Types:
^
P Metric Tires, (R1H 26 lbs.) (R2H 18 lbs.)
^
LT Tires, (R1H 39 lbs.) (R2H 27 lbs.)
4.
Using the tire road force measurement machine, determine the low spot of the wheel run out. Match high point force variation on the tire with the
low spot of wheel run out. Re-test the wheel assembly force variation. If the wheel assembly is now acceptable, rebalance and road test vehicle. If
the condition is corrected return the vehicle to the customer. If not, replace the tire and re-check, then rebalance and road test vehicle. If the
condition is corrected return the vehicle to the customer. It not, proceed to Step 5.
5.
Condition is due to vehicle sensitivity. Obtain Damper Kit 4L3Z-5D008-AA and refer to the instruction sheet included in the kit for installation.
NOTE
THE DAMPER KIT WILL NOT HELP STEERING WHEEL NIBBLE CONDITIONS.
FIRST ORDER DRIVELINE VIBRATION DIAGNOSTIC PROCEDURE 30-40 HZ, 64-97 KM/H (40-60 MPH)
1.
Drive Vehicle at speed where 1st Order Driveline Vibration is most pronounced, typically 64-97 km/h (40-60 MPH).
2.
Once peak vehicle vibration is reached place transmission into neutral.
a.
If the vibration remains with transmission in neutral, the source is most likely the driveshaft. Replace the driveshaft and re-evaluate.
b.
If the vibration is eliminated, the source of vibration is either transmission or rear axle related. Proceed to Step 3.
NOTE
IF POSSIBLE, PERFORM STEPS 3 & 4 WHILE GOING UP A SLIGHT GRADE TO INCREASE LOAD ON ENGINE.
3.
Achieve peak vehicle vibration and set vehicle Speed Control.
4.
Unlock transmission torque converter by hitting overdrive cancel button.
a.
If vibration remains with transmission torque converter unlocked, source of vibration is most likely the rear axle. Replace rear axle and
re-evaluate.
b.
If the vibration is eliminated, the source of the vibration is most likely transmission related. Refer to the Workshop Manual Section 307-01,
Diagnosis By Symptom, Other Concerns. Noise/Vibration in Forward or Reverse for continued diagnosis. Repair as required and
re-evaluate.
