Bronco Full Size L6-300 4.9L (1987)
Linkage.
911211E
Inspect - Vacuum Hoses,
0.1 Hrs.
Electrical Harnesses,
Connectors And Spark Plug
Wires For Routing Damage.
911211F
Thermactor System -
0.3 Hrs.
Inspect For Proper
Operation And Damaged
Component. Includes
Function Check Of Air
Control Valve, Thermactor
Air Bypass Solenoid, Check
Valves, Silencer And Filter.
911211G
Thermostat - Check For
0.2 Hrs.
Proper Operation.
DEALER CODING
BASIC PART NO.
CONDITION CODE
5E212
25
OASIS CODES:
403000, 603300, 614000
Technical Service Bulletin # 911211
Date: 910612
Engine - Lack of Power/No Start Diagnosis
Article No.
91-12-11
06/12/91
LACK OF POWER 7.5L, 5.8L, 5.0L, 4.9L - CATALYTIC CONVERTER DIAGNOSTIC TIPS
LIGHT TRUCK:
1986-91 BRONCO, ECONOLINE, F-150-350 SERIES 1988-91 F SUPER DUTY, F47
ISSUE:
Lack of power or a no start condition may be diagnosed as an exhaust restriction caused by a plugged catalytic converter. A plugged
catalytic converter (internal deterioration) is usually caused by abnormal engine operation.
ACTION:
Diagnose the catalytic converter to confirm internal failure. Refer to the Catalyst and Exhaust System Diagnostic Section, in the
Engine/Emissions Diagnostic Shop Manual and the following procedures for service details.
1.
Lack of proper HEGO operation may cause, or be the result of a rich or lean fuel condition, which could cause additional heat in the catalyst.
Perform self test KOEO and KOER, service any codes.
NOTE:
IF TWO DIGIT CODES 41, 42, 85 OR THREE DIGIT CODES 171, 172, 173, 179, 181, 182, 183 AND 565 ARE RECEIVED, CHECK
FOR PROPER HEGO GROUND.
If the HEGO ground is good, the following areas may be at fault:
^
Ignition Coil
^
Distributor Cap
^
Distributor Rotor
^
Fouled Spark Plug
^
Spark Plug Wires
^
Air Filter
^
Stuck Open Injector
^
Fuel Contamination Engine OIL
^
Manifold Leaks Intake/ Exhaust
