Engine Performance Troubleshooting.pdf

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GENERAL INFORMATION
TROUBLE SHOOTING
ENGINE PERFORMANCE
TUNE-UP TROUBLE SHOOTING
Problem & Possible Cause
Carbon Fouled Plugs
Clogged Air Filter
Incorrect Idle Speed
Faulty Ignition Wiring
Sticky Valves/Worn Valve Seal
Fuel Injection Operation
Wet/Oil Fouled Plugs
Worn Rings/Pistons
Excessive Cylinder Wear
Plug Gap Bridged
Combustion Chamber Carbon Deposits
Blistered Electrode
Engine Overheating
Loose Spark Plugs
Over-Advanced Timing
Wrong Plug Heat Range
Melted Electrodes
Incorrect Timing
Burned Valves
Engine Overheating
Wrong Plug Heat Range
Engine Won't Start
Loose Connections
No Power
Loose/Worn Timing Belt/Chain/Gears
Engine Runs Rough
Leaky/Clogged Fuel Injectors
Leaky/Clogged Fuel Lines
Clogged Fuel Filter
Incorrect Timing
Faulty Plugs/Wires
Uneven Compression
Action
Replace Air Filter
Reset Idle Speed
Replace Ignition Wiring
Check Valve Train
Check Fuel Injection
Overhaul/Replace Engine
Overhaul/Replace Engine
Clean Combustion Chamber
Check Cooling System
Clean/Torque Plugs
Reset Timing
Install Correct Plug
Reset Timing
Replace Valves
Check Cooling System
Install Correct Plug
Check Connections
Check Fuses/Battery
Check Belt/Chain/Gears
Repair Fuel Injectors
Repair Fuel Lines
Replace Fuel Filter
Reset Timing/Check Advance
Replace Plugs/Wires
Overhaul/Replace Engine
Poor Acceleration
Incorrect Ignition Timing
Leaky Valves
Component Failure
Spark Arcing
Defective Pick-Up Coil
Defective Ignition Coil
Defective Control Unit
Ignition Diagnosis By Scope Pattern
All Firing Lines Abnormally High
Retarded Ignition Timing
Lean Air/Fuel Mixture
High Secondary Resistance
All Firing Lines Abnormally Low
Rich Air/Fuel Mixture
Arcing Coil Wire
Cracked Coil
Low Coil Output
Low Compression
Several High Firing Lines
Fuel Mixture Unbalanced
EGR Valve Stuck Open
High Plug Wire Resistance
Cracked/Broken Plugs
Intake Vacuum Leak
Several Low Firing Lines
Fuel Mixture Unbalanced
Plug Wires Arcing
Cracked Coil Arcing
Uneven Compression
Faulty Spark Plugs
Cylinders Not Firing
Cracked Distributor Cap
Shorted Plug Wires
Mechanical Engine Fault
Spark Plugs Fouled
Carbon Track in Distributor Cap
Hard Starting
Defective Ignition Coil(s)
Reset Timing
Check Compression
Replace Faulty Part
Replace Pick-Up Coil
Replace Ignition Coil
Replace Control Unit
Reset Ignition Timing
Adjust Fuel Mixture
Repair Secondary Ignition
Adjust Air/Fuel Mixture
Replace Coil Wire
Replace Coil
Replace Coil
Check/Repair Engine
Check Fuel System
Clean/Replace EGR Valve
Replace Plug Wire
Replace Plugs
Repair Leak
Adjust Fuel Mixture
Replace Plug Wires
Replace Coil
Check/Repair Engine
Replace Plugs
Replace Cap
Replace Plug Wires
Check/Repair Engine
Replace Plugs
Replace Cap
Replace Coil(s)
Fouled Spark Plugs
Incorrect Timing
FUEL INJECTION TROUBLE SHOOTING
Problem & Possible Cause
Cold Start Valve Inoperative
Poor Vacuum/Electrical Connection
Contaminated Fuel
Bad Fuel Pump Relay/Circuit
Battery Voltage Low
Low Fuel Pressure
No Distributor Reference Pulse
Coolant Temp. Sensor Defective
No Power To Injectors
Hard Starting
Defective Idle Air Control (IAC)
EGR Valve Open
Restricted Fuel Lines
Poor MAP Sensor Signal
Engine Stalls During Parking Maneuver
Rough Idle
Dirty Fuel Injectors
Poor MAP Sensor Signal
Intermittent Fuel Injector Operation
Erratic Vehicle Speed Sensor Inputs
Poor O
2
Sensor Signal
Faulty PCV System
Poor Acceleration
Weak Fuel Pump
Dirty Fuel Injectors
Excessive Intake Valve Deposits
Poor High Speed Operation
Low Fuel Pump Volume
Poor MAP Sensor Signal
Acceleration Ping/Knock
Faulty EGR System
Poor Knock Sensor Signal
Poor Baro Sensor Signal
Improper Ignition Timing
Replace Plugs
Reset Ignition Timing
Action
Test Cold Start Valve
Repair Connections
Test Fuel for Water/Alcohol
Test Relay/Wiring
Charge/Test Battery
Test Press. Regulator/Pump
Repair Ignition System
Test Temp. Sensor/Circuit
Check Injector Fuse/Relay
Test IAC and Circuit
Test EGR Valve/Control Circuit
Inspect/Replace Fuel Lines
Test MAP Sensor/Circuit
Check P.S. Press. Switch
Clean/Replace Injectors
Test MAP Sensor/Circuit
Check Harness Connectors
Harness Too Close to Plug Wires
Test O
2
Sensor/Circuit
Check PCV Valve and Hoses
Replace Fuel Pump
Clean/Replace Injectors
Clean Intake System
Faulty Fuel Pump/Filter
Test Speed Sensor/Circuit
Check EGR Valve and Hoses
Test Knock Sensor/Circuit
Test Baro Sensor/Circuit
Adjust Timing
Engine Overheating
Poor Quality Fuel
Carbon Build-Up
Check Cooling System
Use Different Fuel
Decarbon Engine

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