Engine - Lack of Power/No Start Diagnosis
91ford21
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
^ Fuel Pressure
^ Poor Power Ground
^ Engine Not At Normal Operating Temperature
^ HEGO Sensor
2. Spark timing that is retarded from specification may increase exhaust gas temperature and shorten catalyst life. Refer to the following procedure for service details.
a. Check spark timing. Check base timing with spout disconnected. Set base timing to the specification on the vehicle emission decal.
b. Check computed timing with spout connected.
NOTE: COMPUTED TIMING IS EQUAL TO BASE TIMING PLUS 20~ BTDC +/- 3~.
3. Misfiring spark plugs may cause an unburned fuel air mixture to pass through the catalyst, which could cause higher than normal catalyst temperatures. Refer to the following procedure for service details.
a. Check secondary ignition, hook the vehicle up to an engine analyzer and check for a secondary ignition misfire.
NOTE: SERVICE ANY ITEM THAT IS NOT PERFORMING AT PROPER SPECIFICATIONS BEFORE CONTINUING.
4. Fuel pressure that is too high may cause rich air fuel mixtures to pass through the catalyst which could cause higher than normal catalyst temperatures. Refer to the following procedure for service details.
a. Check fuel pressure, install fuel pressure gauge, start and run the engine at idle. Fuel pressures between 28 and 34 PSI are typical (4.9L typically is 15 PSI higher).
b. Disconnect the vacuum line going to the fuel pressure regulator. Fuel pressure typically jumps to 40 PSI +/- 3 PSI (4.9L typically is 15 PSI higher). Visually inspect vacuum line for raw fuel.
NOTE: FUEL PRESSURES ABOVE THESE VALUES SHOULD BE CORRECTED. HOWEVER, THIS MAY NOT BE THE CAUSE OF THE CONCERN. SERVICE AS NECESSARY.
5. Throttle plates in the throttle body not returning to the proper closed position may cause excessive catalyst temperatures during downhill grades. Refer to the following procedure for service details.
a. Visually inspect the throttle body and linkage for:
^ Binding or sticking throttle linkage.
^ Tight speed control linkage or cable.
^ Vacuum line interference.
^ Electrical harness interference.
NOTE: AFTERMARKET GOVERNORS, THROTTLE LINKAGE AND CABLES ASSOCIATED WITH POWER TAKE-OFF UNITS, MAY ALSO INTERFERE WITH PROPER THROTTLE RETURN. SERVICE AS NECESSARY.
6. It is extremely important that all systems related to the engine and emission systems operate properly.
a. Visually inspect the engine compartment to make sure all vacuum hoses and spark plug wires are properly routed and securely connected.
b. Inspect all wiring harnesses and connectors for insulation damage, burned, overheated, loose or broken conditions.
c. Verify proper operation of the thermactor system. Thermactor systems that fail to dump thermactor air to the atmosphere properly or at the correct time can cause high catalyst temperatures.
d. Visually inspect thermactor system for damaged or kinked hoses and perform a function test on following components: air control valve, check valve, silencer, filter and the air bypass solenoid.
e. Verify proper operation of the engine cooling system thermostat.
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under Basic Warranty
Coverage, Emissions
Warranty Coverage
OPERATION DESCRIPTION TIME
911211A Diagnostics - Perform 0.5 Hrs.
KOEO And KOER Self Tests
911211B Timing - Check Or Adjust 0.5 Hrs.
Spark Timing, Check
Computed Timing And
Check Secondary Ignition
System With Engine
Analyzer.
911211C Check - Fuel Pressure And 0.2 Hrs.
Inspect Vacuum Line For
Raw Fuel.
911211D Inspect - Throttle Body And 0.1 Hrs.
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