Ford Festiva. Manual — part 63
Back To Article
GENERAL INFORMATION
TROUBLE SHOOTING
* PLEASE READ THIS FIRST *
ENGINE PERFORMANCE
TUNE-UP TROUBLE SHOOTING
NOTE:
This article is generic in nature and all information does not apply to all vehicles. For vehicle specific
information, see the appropriate articles in the ENGINE PERFORMANCE category.
NOTE:
This article is generic in nature and all information does not apply to all vehicles. For vehicle specific
information, see the appropriate articles in the ENGINE PERFORMANCE category.
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
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
FUEL INJECTION TROUBLE SHOOTING
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)
Fouled Spark Plugs
Replace Plugs
Incorrect Timing
Reset Ignition Timing
NOTE:
This article is generic in nature and all information does not apply to all vehicles. For vehicle specific
information, see the appropriate articles in the ENGINE PERFORMANCE category.
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
Engine Overheating
Check Cooling System
Poor Quality Fuel
Use Different Fuel
Carbon Build-Up
Decarbon Engine
Back To Article
GENERAL INFORMATION
Computer Relearn Procedures
COMPUTER RELEARN PROCEDURES
Vehicles equipped with engine or transmission computers may require a relearn procedure after vehicle battery is disconnected. Many vehicle
computers memorize and store vehicle operation patterns for optimum driveability and performance. When vehicle battery is disconnected,
this memory is lost. The computer will use default data until new data from each key start is stored. As computer memorizes vehicle operation
for each new key start, driveability is restored. Vehicle computers may memorize vehicles operation patterns for 40 of more key starts.
Customers often complain of driveability problems during relearn stage because vehicle acts differently then before being serviced. Depending
on type and make of vehicle and how it is equipped, the following complaints (driveability problems) may exist:
Harsh Or Poor Shift Quality
Rough Or Unstable Idle
Hesitation Or Stumble
Rich Or Lean Running
Poor Fuel Mileage
These symptoms and complaints should disappear after a number of drive cycles have been memorized. To reduce the possibility of
complaints, after any service which requires battery power to be disconnected, vehicle should be road tested.
GENERIC COMPUTER RELEARN PROCEDURES
Some manufacturers identify a specific relearn procedure which will help establish suitable driveability during relearn stage. These procedures
are especially important if vehicle is equipped with and electronically controlled automatic transmission or transaxle. Always complete
procedure before returning vehicle to customer. The following general procedures are to be used if driveability problems are encountered after
power loss or battery has been disconnected. These procedures may provide an aid in eliminating these problems.
Automatic Transmission
Set parking brake, start engine in "P" or "N" position. Warm-up vehicle to normal operating temperature or until cooling fan cycles.
Allow vehicle to idle for one minute in "N" position. Select "D" and allow engine to idle for one minute.
Accelerate at normal throttle position (20-50%) until vehicle shifts into top gear.
Cruise at light to medium throttle.
Decelerate to a stop, allowing vehicle to downshift, and use brakes normally.
Process may be repeated as necessary.
Manual Transmission
Place transmission in Neutral position.
Ensure emergency brake has been set and all accessories are turned off.
Start engine and bring to normal operating temperature.
Allow vehicle to idle in Neutral for one minute.
Initial relearn is complete, and process will be completed during normal driving.
Copyright 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00012612
Back To Article
GENERAL INFORMATION
Drive Axle Noise Diagnosis
* PLEASE READ THIS FIRST *
UNRELATED NOISES
Some driveline trouble symptoms are also common to the engine, transmission, wheel bearings, tires and other parts of the vehicle. Make sure
that cause of trouble actually is in the drive axle before adjusting, repairing, or replacing any parts.
NON-DRIVE AXLE NOISES
A few conditions can sound just like drive axle noise and have to be considered in pre-diagnosis. The 4 most common noises are exhaust, tires,
CV/universal joints and trim moldings.
In certain conditions, the pitch of exhaust gases may sound like gear whine. At other times, it may be mistaken for a wheel bearing rumble.
Tires, especially radial and snow tires, can have a high-pitched tread whine or roar, similar to gear noise. Also, some non-standard tires with an
unusual tread construction may emit a roar or whine.
Defective CV/universal joints may cause clicking noises or excessive driveline play that can be improperly diagnosed as drive axle problems.
Trim and moldings can also cause a whistling or whining noise. Ensure that none of these components are causing the noise before
disassembling the drive axle.
GEAR NOISE
A "howling" or "whining" noise from the ring and pinion gear can be caused by an improper gear pattern, gear damage, or improper bearing
preload. It can occur at various speeds and driving conditions, or it can be continuous.
Before disassembling axle to diagnose and correct gear noise, make sure that tires, exhaust, and vehicle trim have been checked as possible
causes.
CHUCKLE
This is a particular rattling noise that sounds like a stick against the spokes of a spinning bicycle wheel. It occurs while decelerating from 40
MPH and usually can be heard until vehicle comes to a complete stop. The frequency varies with the speed of the vehicle.
A chuckle that occurs on the driving phase is usually caused by excessive clearance due to differential gear wear, or by a damaged tooth on the
coast side of the pinion or ring gear. Even a very small tooth nick or a ridge on the edge of a gear tooth is enough to cause the noise.
This condition can be corrected simply by cleaning the gear tooth nick or ridge with a small grinding wheel. If either gear is damaged or scored
badly, the gear set must be replaced. If metal has broken loose, the carrier and housing must be cleaned to remove particles that could cause
damage.
KNOCK
This is very similar to a chuckle, though it may be louder, and occur on acceleration of deceleration. Knock can be caused by a gear tooth that
is damaged on the drive side of the ring and pinion gears. Ring gear bolts that are hitting the carrier casting can cause knock. Knock can also be
due to excessive end play in the axle shafts.
NOTE:
This is GENERAL information. This article is not intended to be specific to any unique situation or
individual vehicle configuration. For model-specific information see appropriate articles where
available.
NOTE:
This is GENERAL information. This article is not intended to be specific to any unique situation or
individual vehicle configuration. For model-specific information see appropriate articles where
available.
NOTE:
This is GENERAL information. This article is not intended to be specific to any unique situation or
individual vehicle configuration. For model-specific information see appropriate articles where
available.
NOTE:
This is GENERAL information. This article is not intended to be specific to any unique situation or
individual vehicle configuration. For model-specific information see appropriate articles where
available.
NOTE:
This is GENERAL information. This article is not intended to be specific to any unique situation or
individual vehicle configuration. For model-specific information see appropriate articles where
available.
NOTE:
This is GENERAL information. This article is not intended to be specific to any unique situation or
individual vehicle configuration. For model-specific information see appropriate articles where
available.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст