Bronco II 2WD V6-177 2.9L (1986)
Valve Guide: Customer Interest
Engine - Rough Idle/Oil Consumption
Article No. 86-6-24
IDLE - ROUGH - OIL CONSUMPTION (2.9L)
LIGHT TRUCK 1986 RANGER, BRONCO II
Figure 24
The subject concerns could be caused by loose intake manifold bolts. Before disassembling the engine, check the torque of the intake manifold bolts. If
the torque is less than 8 ft.lbs. (10.8 N-m), inspect No. 3 and No. 6 spark plugs. If either spark plug is fouled, replace the intake manifold gasket and
torque the manifold bolts to the specifications and sequence noted on Figure 24. Page 21-20-36 of the 1986 Ranger/Bronco II Truck Shop Manual also
has the torque specifications.
If the intake manifold bolt torque is above 8 ft.lbs. (10.8 N-m) or the spark plugs appear clean, or the concerns continue after an intake manifold has
been installed, disassemble the engine to check valve guide clearances and condition of piston rings and cylinder walls.
PART NUMBER
PART NAME
CLASS
E6TZ-9439-A*
Intake Manifold Gasket
B
E6TZ-9H486-A
Plenum Gasket
C
*
Parts will be available after April 7, 1986.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: 9424ALW - Torque check only.
TIME:
2.1 Hrs. DLR. CODING: Basic Part No. 9424 - Code: 79
