1991 FORD FESTIVA Ignition switch

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Page 233 of 454

FORD FESTIVA 1991  Service Manual Starter Turns but Engine Does Not Rotate
Starter clutch slippingSee STARTER article
Broken clutch housingSee STARTER article
Pinion shaft rusted or drySee STARTER article
Engine basic timing incorrect

Page 234 of 454

FORD FESTIVA 1991  Service Manual TUNE-UP TROUBLE SHOOTING - GAS ENGINE VEHICLES 
BASIC SPARK PLUG TROUBLE SHOOTING CHARTS 
Faulty solenoid switch, switch connections or relayCheck all wiring between 
relay and solenoid or replace 
re

Page 235 of 454

FORD FESTIVA 1991  Service Manual BASIC ELECTRONIC IGNITION TROUBLE SHOOTING CHARTS 
BASIC ELECTRONIC IGNITION TROUBLE SHOOTING CHARTS - USING OSCILLOSCOPE PATTERNS 
plug, see ENGINE 
PERFORMANCE
Chipped Insulators
Severe detonationCh

Page 251 of 454

FORD FESTIVA 1991  Service Manual FUEL INJECTION TROUBLE SHOOTING 
Se ve r a l  High  F ir in g Lin e s
Fuel Mixture UnbalancedCheck Fuel System
EGR Valve Stuck OpenClean/Replace EGR 
Valve
High Plug Wire ResistanceReplace Plug Wire
C

Page 272 of 454

FORD FESTIVA 1991  Service Manual carburetor. As the exhaust gas quickly warms the intake mixture, distribution is improved. This results in better cold engine driveability, 
shorter choke periods and lower emissions. 
Ensure EFE valv

Page 274 of 454

FORD FESTIVA 1991  Service Manual Back To Article 
GENERAL INFORMATION 
Engine Perform ance Safety Precautions 
Always refer to Emission Decal in engine compartment before servicing vehicle. If manual and decal differ, always use d

Page 278 of 454

FORD FESTIVA 1991  Service Manual Back To Article 
GENERAL INFORMATION 
Parasitic Load Explanation & T est Procedures 
* PLEASE READ THIS FIRST * 
GENERAL INFORMATION 
The term Parasitic Load refers to electrical devices that continue

Page 279 of 454

FORD FESTIVA 1991  Service Manual 2. Turn test switch knob to ON position (current through switch). Road test vehicle with vehicle accessories on (radio, air conditioner, etc). 
After road test, turn ignition switch to LOCKED position