Probe V6-182 3.0L (1990)
Technical Service Bulletin # 91246
Date: 911127
Tires/Steering - Vehicle Drift Concerns
Article No.
91-24-6
11/27/91
STEERING - "DRIFT CONCERNS" - REVISED REPAIR PROCEDURES
FORD:
1888-91 PROBE
ISSUE:
Drift to the left or right on a flat level road surface at highway speeds may be caused by improper tire pressures, tire rotation or improper
wheel alignment.
ACTION:
Diagnose and correct the problem using the following service procedures.
Corrective Actions
Follow the procedures, as listed below, to inspect and confirm that the vehicle steering/suspension components, tires (conicity) and wheels are not
damaged or excessively worn.
1.
For 1989-1991 vehicles, Refer to the 1991 Probe Shop Manual, Section 04-00 pages 2-14 for diagnosis and alignment settings.
Figure 1
2.
Adjust tire pressure to 32 psi front and 36 psi rear, road test the vehicle driving at 55 mph/88 km/h on a level road. If possible drive on a 3 lane
freeway as shown in figure 1.
NOTE: WHEN EVALUATING THE VEHICLE FOR DRIFT CONDITIONS, CROSS WINDS CAN AFFECT THE RESULTS, THEREFORE
DRIVE IN BOTH (OPPOSING) DIRECTIONS AT LEAST TWICE AND AVERAGE THE DRIFT TIMES IN SECONDS. THIS ROAD
TEST EVALUATION SHOULD BE PERFORMED BY TWO (2) PEOPLE IN THE VEHICLE, ONE PERSON TO DRIVE AND THE
OTHER TO MONITOR THE DRIFT TIME IN SECONDS.
3.
If the vehicle changes one complete 12 ft. wide lane in seven (7) seconds or less, proceed to step 4.
NOTE:
IF THE TIME IS SEVEN (7) SECONDS OR HIGHER, THE VEHICLE IS OPERATING AT DESIGN INTENT AND DOES NOT
REQUIRE FURTHER ACTION.