Volkswagen New Beetle. Manual - part 77

 

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Volkswagen New Beetle. Manual - part 77

 

 

GENERAL INFORMATION 

TROUBLE SHOOTING 

ENGINE PERFORMANCE 

TUNE-UP TROUBLE SHOOTING 

Problem & Possible Cause 

Action 

Carbon Fouled Plugs 

Clogged Air Filter 

Replace Air Filter 

Incorrect Idle Speed 

Reset Idle Speed 

Faulty Ignition Wiring 

Replace Ignition Wiring 

Sticky Valves/Worn Valve Seal 

Check Valve Train 

Fuel Injection Operation 

Check Fuel Injection 

Wet/Oil Fouled Plugs 

Worn Rings/Pistons 

Overhaul/Replace Engine 

Excessive Cylinder Wear 

Overhaul/Replace Engine 

Plug Gap Bridged 

Combustion Chamber Carbon Deposits 

Clean Combustion Chamber 

Blistered Electrode 

Engine Overheating 

Check Cooling System 

Loose Spark Plugs 

Clean/Torque Plugs 

Over-Advanced Timing 

Reset Timing 

Wrong Plug Heat Range 

Install Correct Plug 

Melted Electrodes 

Incorrect Timing 

Reset Timing 

Burned Valves 

Replace Valves 

Engine Overheating 

Check Cooling System 

Wrong Plug Heat Range 

Install Correct Plug 

Engine Won't Start 

Loose Connections 

Check Connections 

No Power 

Check Fuses/Battery 

Loose/Worn Timing Belt/Chain/Gears 

Check Belt/Chain/Gears 

Engine Runs Rough 

Leaky/Clogged Fuel Injectors 

Repair Fuel Injectors 

Leaky/Clogged Fuel Lines 

Repair Fuel Lines 

Clogged Fuel Filter 

Replace Fuel Filter 

Incorrect Timing 

Reset Timing/Check Advance 

Faulty Plugs/Wires 

Replace Plugs/Wires 

Uneven Compression 

Overhaul/Replace Engine 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION TROUBLE SHOOTING

  

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION TROUBLE SHOOTING

  

Poor Acceleration 

Incorrect Ignition Timing 

Reset Timing 

Leaky Valves 

Check Compression 

Component Failure 

Spark Arcing 

Replace Faulty Part 

Defective Pick-Up Coil 

Replace Pick-Up Coil 

Defective Ignition Coil 

Replace Ignition Coil 

Defective Control Unit 

Replace Control Unit 

Ignition Diagnosis By Scope Pattern 

All Firing Lines Abnormally High 

Retarded Ignition Timing 

Reset Ignition Timing 

Lean Air/Fuel Mixture 

Adjust Fuel Mixture 

High Secondary Resistance 

Repair Secondary Ignition 

All Firing Lines Abnormally Low 

Rich Air/Fuel Mixture 

Adjust Air/Fuel Mixture 

Arcing Coil Wire 

Replace Coil Wire 

Cracked Coil 

Replace Coil 

Low Coil Output 

Replace Coil 

Low Compression 

Check/Repair Engine 

Several High Firing Lines 

Fuel Mixture Unbalanced 

Check Fuel System 

EGR Valve Stuck Open 

Clean/Replace EGR Valve 

High Plug Wire Resistance 

Replace Plug Wire 

Cracked/Broken Plugs 

Replace Plugs 

Intake Vacuum Leak 

Repair Leak 

Several Low Firing Lines 

Fuel Mixture Unbalanced 

Adjust Fuel Mixture 

Plug Wires Arcing 

Replace Plug Wires 

Cracked Coil Arcing 

Replace Coil 

Uneven Compression 

Check/Repair Engine 

Faulty Spark Plugs 

Replace Plugs 

Cylinders Not Firing 

Cracked Distributor Cap 

Replace Cap 

Shorted Plug Wires 

Replace Plug Wires 

Mechanical Engine Fault 

Check/Repair Engine 

Spark Plugs Fouled 

Replace Plugs 

Carbon Track in Distributor Cap 

Replace Cap 

Hard Starting 

Defective Ignition Coil(s) 

Replace Coil(s) 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION TROUBLE SHOOTING

  

FUEL INJECTION TROUBLE SHOOTING 

Fouled Spark Plugs 

Replace Plugs 

Incorrect Timing 

Reset Ignition Timing 

Problem & Possible Cause 

Action 

Cold Start Valve Inoperative 

Test Cold Start Valve 

Poor Vacuum/Electrical Connection 

Repair Connections 

Contaminated Fuel 

Test Fuel for Water/Alcohol 

Bad Fuel Pump Relay/Circuit 

Test Relay/Wiring 

Battery Voltage Low 

Charge/Test Battery 

Low Fuel Pressure 

Test Press. Regulator/Pump 

No Distributor Reference Pulse 

Repair Ignition System 

Coolant Temp. Sensor Defective 

Test Temp. Sensor/Circuit 

No Power To Injectors 

Check Injector Fuse/Relay 

Hard Starting 

Defective Idle Air Control (IAC) 

Test IAC and Circuit 

EGR Valve Open 

Test EGR Valve/Control Circuit 

Restricted Fuel Lines 

Inspect/Replace Fuel Lines 

Poor MAP Sensor Signal 

Test MAP Sensor/Circuit 

Engine Stalls During Parking Maneuver 

Check P.S. Press. Switch 

Rough Idle 

Dirty Fuel Injectors 

Clean/Replace Injectors 

Poor MAP Sensor Signal 

Test MAP Sensor/Circuit 

Intermittent Fuel Injector Operation 

Check Harness Connectors 

Erratic Vehicle Speed Sensor Inputs 

Harness Too Close to Plug Wires 

Poor O 

2

 Sensor Signal 

Test O 

2

Sensor/Circuit 

Faulty PCV System 

Check PCV Valve and Hoses 

Poor Acceleration 

Weak Fuel Pump 

Replace Fuel Pump 

Dirty Fuel Injectors 

Clean/Replace Injectors 

Excessive Intake Valve Deposits 

Clean Intake System 

Poor High Speed Operation 

Low Fuel Pump Volume 

Faulty Fuel Pump/Filter 

Poor MAP Sensor Signal 

Test Speed Sensor/Circuit 

Acceleration Ping/Knock 

Faulty EGR System 

Check EGR Valve and Hoses 

Poor Knock Sensor Signal 

Test Knock Sensor/Circuit 

Poor Baro Sensor Signal 

Test Baro Sensor/Circuit 

Improper Ignition Timing 

Adjust Timing 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION TROUBLE SHOOTING

  

Engine Overheating 

Check Cooling System 

Poor Quality Fuel 

Use Different Fuel 

Carbon Build-Up 

Decarbon Engine 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION TROUBLE SHOOTING

  

 

 

 

 

 

 

 

Content   ..  75  76  77  78   ..