1991 FORD FESTIVA torque

Throttle Actuator Module
TAD
Thermactor Air Diverter
TBC
Body Control Module
TBI
Throttle Body Injection
TCC
Torque Converter Clutch
TDC
Top Dead Center
Temp.
Temperature
TFI
Thick Film Ignition
THERMAC
Thermostatic Air Cleaner
TPM
Tire Pressure Monitor
TPMS
Tire Pressure Monitor System
TPS
Throttle Position Sensor/Switch
TS
Temperature Sensor
TV
Thermovalve
TWC
Three-Way Catalyst
"V"
V
Valve
Vac.
Vacuum
VAF
Vane Airflow
VAPS
Variable Assist Power Steering
VCC
Viscous Converter Clutch
Page 14 of 15 MITCHELL 1 ARTICLE - GENERAL INFORMATION Commonly Used Abbreviations
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ENGINES
Valve "O" ring seals damagedReplace "O" ring seals, See
ENGINES
Plugged oil drain back holesRemove restrictions
Improper PCV valve operationReplace PCV valve
Engine oil level too highRemove excess oil
Engine oil too thinReplace thicker oil
Valve stem oil deflectors damagedReplace oil deflectors
Incorrect piston ringsReplace piston rings, See
ENGINES
Piston ring gaps not staggeredReinstall piston rings, See
ENGINES
Insufficient piston ring tensionReplace rings, See ENGINES
Piston ring grooves or oil returnslots clogged Replace piston
rings, See ENGINES
Piston rings sticking in groovesReplace piston rings, See
ENGINES
Piston ring grooves excessively wornReplace piston and rings, See
ENGINES
Compression rings installed upside downReplace compression rings
correctly, See ENGINES
Worn or scored cylinder wallsRebore cylinders or replace
block
Mismatched oil ring expander and railReplace oil ring expander and
rail, See ENGINES
Intake gasket dowels too longReplace intake gasket dowels
Excessive main or connecting rod bearing clearanceReplace main or connecting
rod bearings, See ENGINES
No Oil Pressure
Low oil levelAdd oil to proper level
Oil pressure sender or gauge brokenReplace sender or gauge
Oil pump malfunctionRemove and overhaul oil
pump, See ENGINES
Oil pressure relief valve stickingR e mo ve a n d r e in st a l l va l ve
Oil pump passages blockedOverhaul oil pump, See
ENGINES
Oil pickup screen or tube blockedRemove restriction
Loose oil inlet tubeTighten oil inlet tube
Loose camshaft bearingsReplace camshaft bearings,
See ENGINES
Internal leakage at oil passagesReplace block or cylinder
head
Low Oil Pressure
Low engine oil levelAdd oil to proper level
Engine oil too thinRemove and replace with
thicker oil
Excessive oil pump clearanceReduce oil pump clearance,
See ENGINES
Oil pickup tube or screen blockedRemove restrictions
Main, rod or cam bearing clearance excessiveReplace bearing to reduce
clearance, See ENGINES
High Oil Pressure
Improper grade of oilReplace with proper oil
Oil pressure relief valve stuck closedEliminate binding
Oil pressure sender or gauge faultyReplace sender or gauge
Noisy Main Bearings
Inadequate oil supplyCheck oil delivery to main
bearings
Excessive main bearing clearanceReplace main bearings, See
ENGINES
Excessive crankshaft end playReplace crankshaft, See
ENGINES
Loose flywheel or torque converterTighten attaching bolts
Loose or damaged vibration damperTighten or replace vibration
damper
Crankshaft journals out-of-roundRe-grind crankshaft journals
Excessive belt tensionLoosen belt tension
Noisy Connecting Rods
Excessive bearing clearance or missing bearingReplace bearing, See
ENGINES
Crankshaft rod journal out-of-roundRe-grind crankshaft journal
Misaligned connecting rod or capRemove rod or cap and realign
Incorrectly tightened rod boltsRemove and re-tighten rod
Page 11 of 36 MITCHELL 1 ARTICLE - GENERAL INFORMATION Trouble Shooting - Basic Procedures
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Back To Article
GENERAL INFORMATION
T ROUBLE SHOOT ING
* PLEASE READ THIS FIRST *
ENGINE PERFORMANCE
TUNE-UP TROUBLE SHOOTING NOTE:T his article is generic in nature and all inform ation does not apply to all vehicles. For vehicle specific
inform ation, see the appropriate articles in the ENGINE PERFORMANCE category.
NOTE:T his article is generic in nature and all inform ation does not apply to all vehicles. For vehicle specific
inform ation, see the appropriate articles in the ENGINE PERFORMANCE category.
Problem & Possible CauseAction
Carbon Fouled Plugs
C l o gge d Air Fil t e rReplace Air Filter
Incorrect Idle SpeedReset Idle Speed
Faulty Ignition WiringReplace Ignition Wiring
Sticky Valves/Worn Valve SealCheck Valve Train
Fuel Injection OperationCheck Fuel Injection
Wet/Oil Fouled Plugs
Worn Rings/PistonsOverhaul/Replace Engine
Excessive Cylinder WearOverhaul/Replace Engine
Plug Gap Bridged
Combustion Chamber Carbon DepositsClean Combustion
Chamber
Blistered Electrode
Engine OverheatingCheck Cooling System
Loose Spark PlugsClean/Torque Plugs
Over-Advanced TimingReset Timing
Wrong Plug Heat RangeInstall Correct Plug
Melted Electrodes
Incorrect TimingReset Timing
Burned ValvesReplace Valves
Engine OverheatingCheck Cooling System
Wrong Plug Heat RangeInstall Correct Plug
Engine Won't Start
Loose ConnectionsCheck Connections
No PowerCheck Fuses/Battery
Loose/Worn Timing Belt/Chain/GearsCheck Belt/Chain/Gears
Engine Runs Rough
Leaky/Clogged Fuel InjectorsRepair Fuel Injectors
Leaky/Clogged Fuel LinesRepair Fuel Lines
Clogged Fuel FilterReplace Fuel Filter
Incorrect TimingReset Timing/Check
Advance
Faulty Plugs/WiresReplace Plugs/Wires
Uneven CompressionOverhaul/Replace Engine
Poor Acceleration
Incorrect Ignition TimingReset Timing
Leaky ValvesCheck Compression
Component Failure
Spark ArcingReplace Faulty Part
Defective Pick-Up CoilReplace Pick-Up Coil
Defective Ignition CoilReplace Ignition Coil
Defective Control UnitReplace Control Unit
Ignition Diagnosis By Scope Pattern
All Firing Lines Abnormally High
Retarded Ignition TimingReset Ignition Timing
Lean Air/Fuel MixtureAdjust Fuel Mixture
High Secondary ResistanceRepair Secondary
Ign it io n
All Firing Lines Abnormally Low
Rich Air/Fuel MixtureAdjust Air/Fuel Mixture
Arcing Coil WireReplace Coil Wire
Cracked CoilReplace Coil
Low Coil OutputReplace Coil
Low CompressionCheck/Repair Engine
Page 1 of 3 MITCHELL 1 ARTICLE - GENERAL INFORMATION TROUBLE SHOOTING
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5. Using Shaft Seal Remover/Installer (T87P-19623-C), remove seal by pushing downward on shaft seal remover/installer and rotating
clockwise to engage seal tangs. Pull seal from compressor.
Installation
1. Place Shaft Seal Protector (T71P-19703-H) over compressor shaft. Lubricate shaft seal and nose of compressor with new refrigerant oil.
DO NOT touch sealing surface of seal or shaft. Engage seal tangs on shaft seal remover/installer.
2. Align flats of seal with flats on crankshaft and push new seal on compressor shaft. Push downward on shaft seal remover/installer and
turn counterclockwise to disengage seal tangs.
3. Attach shaft seal seat to shaft seal seat remover/installer and lubricate with new refrigerant oil. Install seal seat and push inward against
seal. Install seal seat retaining snap ring.
4. Install dust seal retainer and felt packing. Install clutch plate shims. Ensure clutch plate aligns with crankshaft key. Using Clutch Plate
Installer (T80L-19703-F), install clutch plate.
5. Install crankshaft nut. Using spanner to hold clutch, tighten crankshaft nut to 10-14 ft. lbs. (13-20 N.m). DO NOT tighten nut with air
tools.
6. Using feeler gauge, check clearance between clutch plate and pulley. Rotate compressor clutch and check clearance in more than one
place. Proper clearance is .021-.036" (.53-.91 mm). If clearance is not correct, add or remove shims.
7. Add same amount new refrigerant oil to compressor as was drained. Rotate compressor 10 revolutions to distribute oil. Install
compressor. Evacuate and recharge system. Perform leak test.
NIPPONDENSO 10P15A SHAFT SEAL
Removal
1. Discharge system using approved refrigerant recovery/recycling equipment and remove compressor. Drain oil from compressor and
record amount for reassembly. Remove clutch assembly. See NIPPONDENSO 10P15A CLUTCH ASSEMBLY R & I in this article.
2. Remove manifold assembly from top of compressor. Clean compressor front hub area. Using Ring Remover (T71P-19703-C), remove
retaining ring from front of compressor shaft.
3. Remove felt seal from front of compressor. Remove front head retaining bolts and front head from compressor. Remove snap ring fro m
rear of front head. Remove seal from rear of front head.
Installation
1. Install seal and snap ring in front head. Install front head on compressor. Tighten bolts to 18-20 ft. lbs. (24-27 N.m). Install felt packing
and retaining ring.
2. Install manifold assembly and tighten bolts to 18-20 ft. lbs. (24-27 N.m). Add same amount of new refrigerant oil to compressor as that
drained from compressor. Rotate compressor 10 revolutions to distribute oil in compressor. Install compressor. Evacuate and recharge
system. Perform leak test.
NIPPONDENSO 10PA17 & 10PA17A CLUTCH ASSEMBLY
Removal
1. Remove compressor shaft bolt and discard. Remove clutch plate and shims. If clutch hub cannot be removed by hand, thread a 8-mm
bolt in center of clutch plate. Tighten bolt and remove clutch plate.
2. Remove pulley assembly retaining snap ring. Remove pulley assembly. Remove snap ring and disconnect clutch coil electrical wiring.
Remove clutch coil.
Installation
1. Install clutch coil so pin in back of coil aligns with hole in front housing. Install snap ring with beveled side away from compressor.
2. Install pulley assembly. Install snap ring with beveled side away from compressor. Coat splines of compressor shaft with White grease. I
f
reusing original clutch plate and pulley, old shims can be used.
3. If installing new components, install one thin shim. Install clutch plate. Tighten compressor shaft bolt to 10 ft. lbs. (14 N.m). DO NOT
air tools to tighten bolt.
4. Using feeler gauge, measure air gap between clutch plate and pulley surface in 3 areas. Proper clearance is .014-.026" (.35-.66 mm).
Adjust shim thickness to obtain correct clearance.
5. Once compressor shaft bolt is tightened, recheck clearance between clutch plate and pulley surface in 4 places. Readjust clearance if
necessary.
NIPPONDENSO 10PA17 & 10PA17A SHAFT SEAL
Removal
1. Discharge system using approved refrigerant recovery/recycling equipment and remove compressor. Drain oil from compressor and
record amount for reassembly. Install compressor in Holding Fixture (T89P-19623-D) and clamp fixture in a vise.
2. Remove clutch assembly. See NIPPONDENSO 10PA17 & 10PA17A CLUTCH ASSEMBLY R & I in this article. Remove front head
retaining bolts. Separate front head from compressor, using care not to scratch sealing surface. See Fig. 4
.
3. Using "O" Ring Remover (T71P-19703-C), remove felt dust seal and dust seal retainer from front head. Remove shaft seal retaining snap
ring. Position front head (nose up) on cardboard placed on a flat surface. Using Shaft Seal Remover (T89P-19623-E), push shaft seal
from front head. NOTE:After installing new clutch, ensure voltage is correct and cycle clutch with 5 seconds on and 5 seconds
off. Repeat cycle for approxim ately 20 tim es with A/C on, blower fan on high speed and engine RPM at
1500-2000. T his provides better clutch torque capability.
Page 6 of 7 MITCHELL 1 ARTICLE - GENERAL SERVICING 1991 Ford Compressor Overhaul
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Fig. 2: Bosch 6
-Cylinder Compressor Clutch
Courtesy of BMW OF NORTH AMERICA, INC.
CALSONIC V5 CLUTCH R & I
Removal
1. Remove shaft nut while holding armature plate with clutch disk wrench. Install clutch disk puller and remove clutch plate. Remo ve sn ap
ring from center of clutch pulley.
2. Use a universal gear puller to remove clutch pulley. See Fig. 3
.Remove screw securing clutch coil ground lead. Use puller to remove
clutch coil.
Installation
1. To install clutch coil, reverse removal procedure. Carefully press clutch coil into place. Ensure that coil lead and connector are
positioned on same side as removed coil.
2. Install a NEW clutch pulley snap ring, being careful not to damage shaft seal. Press clutch plate into place. Install shaft nut and torque
to 0.9-1.4 INCH lbs. (0.10-.12 N.m).
3. Use a feeler gauge to check clutch plate-to-pulley clearance. Clearance should be .012-.024" (0.3-0.6 mm). If clearance is too large,
remove shaft nut and again press in clutch plate. If clearance is too small, increase gap by pulling up clutch plate. Do not remo ve sh aft
nut.
Page 3 of 18 MITCHELL 1 ARTICLE - A/C COMPRESSOR SERVICING 1991 GENERAL SERVICING Compressor Service
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Fig. 1: Exploded View of Heater Unit

Courtesy of FORD MOTOR CO.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
WIRING DIAGRAMS

Fig. 2: Heater Wiring Diagram

ApplicationINCH Lbs. (N.m)
Steering Wheel Nut29-36 (39-49)
Page 3 of 4 MITCHELL 1 ARTICLE - HEATER SYSTEM 1990-92 HEATER SYSTEMS Ford Motor Co.
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WHEEL ALIGNMENT
After performing appropriate service procedures, refer to WHEEL ALIGNMENT SPECIFICATIONS & PROCEDURES article in the WHEEL
ALIGNMENT section.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
ApplicationFt. Lbs. (N.m)
Pinion Adjusting Screw Lock Nut29-36 (39-49)
Mounting Bracket Bolt23-34 (31-46)
Tie Rod End Castle Nut26-30 (35-40)
Tie Rod-to-Rack Ball Joint43-58 (58-79)
Copyr ight 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00054859
Page 3 of 3 MITCHELL 1 ARTICLE - STEERING SYSTEM - MANUAL 1991 STEERING Ford Motor Co. - Steering - Manual Rack & Pi
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1. Position steering gear in its mounting position. Attach intermediate shaft to steering gear pinion and tighten clamp bolt to 13-20 ft. lbs.
(18-26 N.m). Guide intermediate shaft into steering column hole. Lower vehicle.
2. Lift steering gear and align intermediate shaft with universal joint and install clamp bolt. Raise vehicle. Install steering gear mounting
bolts and tighten to 23-34 ft. lbs. (31-46 N.m). Install right tie rod end, using marks made during removal for installation reference.
Attach tie rod ends to steering knuckles. Install tie rod end nuts and tighten to 22-33 ft. lbs. (29-44 N.m).
3. Install tie rod end cotter pins. Attach catalytic converter to inlet pipe and install attaching nuts. Tighten nuts to 23-34 ft. lbs. (31-46
N.m). Install tie rod end splash shields. Install right fender splash shield. install front wheels. Lower vehicle.
4. Connect high pressure and return lines. Connect negative battery cable. Add power steering fluid and bleed air from system and check
for leaks. See HYDRAULIC FLUID BLEEDING
under LUBRICATION.
POWER STEERING PUMP
Removal (Capri)
1. Remove right radiator support and brace. Remove pump drive belt. Disconnect intercooler outlet hose at throttle intake (if equipped).
R e mo ve gr o u n d wir e fr o m e n gin e l ift in g e ye .
2. Remove pressure and return hoses and plug. Remove wire from pressure switch. Remove adjusting screw, nut and block from pump
bracket. Remove pivot bolt. Remove bracket retaining bolts then remove pump.
Removal (Festiva)
Remove air duct and air cleaner. Disconnect electrical connector from fluid pressure switch on power steering pump. Disconnect and plug
return and pressure lines. Remove adjustment bolt. Remove lock nut, washer and bracket bolt. Loosen mounting bolt and disconnect drive
belt. Remove mounting bolt. Remove power steering pump.
Installation (Capri & Festiva)
To install pump, reverse removal procedure. Adjust steering belt tension. Tighten all nuts and bolts to specification. See TORQUE
SPECIFICATIONS . Add power steering fluid and bleed air from system and check for leaks. See HYDRAULIC FLUID BLEEDING
under LUBRICATION.
OVERHAUL
STEERING GEAR
Disassembly (Capri)
1. Remove steering gear and place in soft-jawed vise. Remove external hydraulic lines. See Fig. 1 . Remove mount brackets and rubber
mount bushings. Remove brass tubing seats using a self-tapping screw and 2 screwdrivers.
Page 2 of 9 MITCHELL 1 ARTICLE - STEERING SYSTEM - POWER 1991-92 STEERING Ford Motor Co. - Steering - Power Rack & Pi
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