Repair and Diagnosis: Technical Service Bulletins

• How to Find Technical Service Bulletins by Category/Symptom
• Customer Interest
  • Engine - Droning Noise From External Oil Cooler Area
  • Engine Performance - Surging Idle or Hesitations
  • Engine - Oil In the Cooling System
  • Intake Manifold Temperature Switch - Not Functional
  • Brakes - Objectionable Noise
    • Overview
    • General Information:
    • Front Axle Vibration Damper and Damping Plate Application Chart
    • Vibration Damper and Damping Plate Application Chart
  • Front Brakes - Groaning Type Noise
  • Camshaft Drive Belt - Noise at 1800 RPM
  • Coolant Pump - Leaks
  • Leather Upholstery - Reconditioning
  • Hydraulic Clutch - Pedal Stays Down/Air In the System
  • Battery - Diagnosing a Discharging Condition
    • Overview
    • 1. General Information
    • 2. Battery Service/General
    • 3. Vehicle Delivery Hints (See Delivery Check Sheet)
    • 4.0 Replacement Battery (Filled or DRY)
    • 5. Discharged Battery
      • Overview
      • 5.1 Preservation Charging
      • 5.2 Discharged and Sulfated Batteries
      • 5.3 Reference Values For Battery Discharge/Parking Time
    • 6. Battery Voltage Checking
      • Overview
      • 6.1 Battery Voltage Correction Values
      • 6.2 Checking Electrolyte Density
      • 6.3 Correction Values For Electrolyte Density
    • 7. Starting Capability (Load Test)
    • 8. Checking Constant Current Draw ( All Vehicle Types)
    • 9. Summary
    • Battery Maintenance Log Sheet
    • Battery Check Sheet
  • Electric Seat - Jammed in Backward Stop Position
  • Radio DIN Cable - Damaged During Removal
  • Radio Knobs - Broken
  • Radio - Discharged Battery/Alarm System Malfunction
  • Brakes - Pedal Pulsation/Vibration
  • Steering Wheel - Noise When Turning
  • Cabriolet Top & Trunk Compartment - Water Leaks
    • Overview
    • Water Test
    • Section A:Additional Water Drains
    • Section B:Trunk Area
    • Section C:Top Sealing
    • Section D:Door Window Adjustment
  • Cabrio Top - Water Leaks
  • Air Bag Warning Lamp ON, DTC 60 Set
  • Engine - Oil Pressure Too High
• Labor/Parts Updates
  • Front Brakes - Groaning Type Noise
• Superceded Bulletins
  • 20/07 - 12/21/07
  • 91/05 - 07/28/05
  • 43/02 - 11/18/02
  • 49004 - 02/15/90
  • WARR9007 - 04/06/90
  • 49006 - 06/22/90
  • 69001 - 01/26/90
  • 98806 - 12/30/88
  • TOOLS9001 - 06/08/90
  • WARR9019 - 11/18/88
  • 48811 - 12/02/88
  • 48705 - 06/05/87
  • 49006 - 08/07/90
  • WARR9007 - 12/21/90
  • 49101 - 01/22/91
  • 69101 - 02/08/91
  • 49104 - 04/09/91
  • 49108 - 08/16/91
  • 9201 - 06/25/92
  • 49303 - 09/14/93
  • 9407 - 02/17/94
  • WARR9409 - 09/02/94
  • WARR9508 - 01/26/95
  • 19011 - 05/08/90
  • 19001 - 02/02/90
  • 18708 - 06/03/87
  • 18628 - 12/16/86
  • Warranty Program - Pre-Owned Vehicles
  • A/C - New Sealing Rings for Expansion Valves
  • Power Steering Racks - Diagnosing & Repairing Leaks
  • Brakes - Objectionable Noise/Vibration
  • Cylinder Head Gaskets - Oversized for Machined Heads
  • Tires/Wheels - Winter Recommendation Summary
  • Tire Manufacturers - Customer Service Phone Numbers
  • Tires/Wheels - Winter Snow Chain Summary
  • Engine - Porsche Approved Engine Oils
  • Engine - Engine Oils Approved By Porsche
  • Engine - Overview Of Approved Engine Oils
  • Engine - Approved Engine Oil Specifications
• All Technical Service Bulletins
  • Drivetrain - Drive Shaft Grease Incorrectly Labeled
  • Vehicle - Use Only Approved Parts For Collision Repairs
  • 49005 - 05/08/90
  • 18801 - 02/12/88
  • Warranty - Pre-Owned Program Changed
  • Tools - Quick Scope Plus
  • Tools - Auto Scopemeter & Engine Analyzer
  • Technical Information (Advanced) - 23rd Supplement
    • Overview
    • 928 M.Y. 1985/86 Flywheel/Ignition Timing-Performance Problems
    • 924S, 944, 944S M.Y. 1988 Crankcase Ventilation Heater
    • 928 S4 M.Y. 1988 Engine Oil Level Checking System -- Modified
    • 944 Engine Performance - to Determine Cause of Problem
    • 928/928 S4 Ignition Trigger Control Heat Conducting Paste
    • 911 Turbo M.Y. 1986 Ignition Delay Relay - Modified
    • 911 Turbo M.Y. 1986 Acceleration/Enrichment Relay - Modified
    • 924 Turbo M.Y. '81/'82 Ignition Control Unit - Pressure Line
    • 911 Carreara M.Y. 1987 DME Control Unit Modified
    • 911 Turbo M.Y. 1987 Acceleration - Enrichment Relay - Modified
    • 944S, 944T M.Y. 1988 DME Control Unit: Modified
    • 944S, 944T Knock Sensor - Modified
    • 928 S4 M.Y. '87 - '89 Battery - Modified
    • 928 S4 M.Y. '89 TDC Sending Unit - Deleted
    • 911C2/4 *Reduced Engine Broking Effect
    • 911 Carrera M.Y. 1984 Trans Mainshaft Bearing Loose
    • 944 Transmission/Drive Train Noise
    • Carrera 2/4 *Additional Shifter Boot Installed
    • 911 Carrera M.Y. 1987 Rear Stabilize BAR - Modified
    • 944, 944S 944T M.Y. 1988 With M-593 ABS - Modified
    • 911 Carrera 911 Turbo M.Y. '88 Hand Brake Shoes - Modified
    • 944, 944S, 944 S2, 944T, 928, 928S 928 S4, 928 GT P.S. Belt Tension
    • 911 Carrera Door Lock/Tumbler Set - Replacements
    • 928S Front Hood - Height Adjustment
    • 944 Front Fender - Modified
    • 944, 944T M.Y. '89 Rear Lid Modified
    • 911 C 2/4 *Door Contact Switch Modified
    • 911 Carrera M.Y. 1985 Electric Window Winder Relay - Relocated
    • 911 Carrera M.Y. 1985 Mirror Switch and Window Heater
    • 911 Cabrio M.Y. '86 - '89 Convertible Locking Motors - Modified
    • 911 C2/4 *Tonneau Cover Strap Fasteners Installed
    • 944, 944 Turbo M.Y. '86 Seat Back Unlocking Knob - Installation Procedure
    • 944, 944T M.Y. '89 A/C High and Low Pressure Switch Modified
    • 924 Turbo M.Y. 1981 Tachometer - Supersession
    • 911 Carrera 911 Turbo M.Y. 1988 Luggage Compartment Wiring Harness
    • 928 S4 Securing of Battery Ground Cable - Modified
    • 928 S4 911/T M.Y. '88 Alarm System - Modified
    • 928 S4 All 4 CYL. M.Y. 1988 Windshield Wiper Relay - Modified
    • 928S/928 S4 M.Y. '86, '87, '88 Modified Rear Lid Motor
    • 911 Carrera 911 Turbo 928 S4 Spare Paint Deleted
  • Tools - Minimum Requirement for Vehicle Repairs
  • Tools - PSD Lock Measuring Cylinder Has Wrong Spring
  • Warranty - Special Colored Mailing Envelopes
  • Warranty - Roadside Assistance Rental Car Authorization
  • Warranty and Procedures Manual - Revised
  • Warranty - Request For Repair Assistance Forms Change
  • Tools - Modules for Bosch Tester 9288
  • Warranty - Engine Follow Up Service After Major Repairs
  • Electrical Harnesses - Routing and Securing
  • VIN, Certification, & Emission Label - Availability
  • Vehicle - Approximate Oil/Fluid Capacities Chart
  • Tools - Minimum Requirement Listing
  • Vehicle - Repair Times & Maintenance Requirements
    • Overview
    • General Information and Operation Numbers
    • 2,000-2,500 Mile Service
    • 15/45 and 75,000 Mile Service
    • 30/60 and 90,000 Mile Service
    • Other Service Intervals
  • Warranty - Access Start Dates and Recall Inquiry
  • Technical Information Books - Available Stock Listing
  • Techincal Information Booklets - Current Availability
  • Warranty Training - Available for Year 1990
    • Overview
    • Long Beach, CA
    • Atlanta
    • Chicago
    • Pine Brook
    • Reno
  • Warranty - Microfiche Tips, Types of Labor Time
    • Overview
    • Claiming Actual Time (A-Time)
    • Diagnosis Time
    • Overlapping Labor
    • Operation Description Labor Overlap, Examples
  • Tools - List of Recommended General Tools and Equipment
  • Warranty - Transactions Close-Out Announcement
  • Microfiche - Suggested Repair Times, Table of Contents
  • Warranty Training - Videotapes Available
  • Warranty - Improper Modifications to Electrical System
  • Warranty - Current Bulletins
  • Tools - Testers for Alarms, Central Warning, & Air Bag
  • Air Regulation Controls - Modified
    • Overview
    • Parts Information:
    • Repair Information:
    • Warranty Information:
  • A/C - Revised Sealing Rings for Expansion Valves
  • Tools - Refrigerant Recovery/Recycling Equipment
  • A/C - Substitutes for R-12 Refrigerant
  • A/C Refrigerant - Identifier
  • A/C - Retrofitting R12 Systems to R134
    • Overview
    • Procedures
  • A/C - Refrigerant 134a Use
  • Power Steering - New Procedures Working on Pumps/Racks
  • Camshaft Drive Belts - Recommended Usage
  • Connecting Rod Nuts - Incorrectly Made
  • Engine - Droning Noise From External Oil Cooler Area
  • Engine Performance - Surging Idle or Hesitations
  • Pistons & Rings - Modified
  • Engine - Oil In the Cooling System
  • Tools - Oil Cooler Testing
  • Sodium Filled Valves - Scrapping Instructions
  • Oil Pan - Sealing
  • Cylinder Heads - Tightening Procedure & Service Changes
    • Overview
    • 924 Model
    • 924 Turbo Model
    • 924S, 944, 944S, 944 Turbo Model
    • 911 Carrera Model
    • 928, 928S, 928 S4 Model
  • Toothed Engine Belts - Storage, Packing and Handling
  • Valve Seal - Replacement Procedure
    • Overview
    • Work Procedure:
    • Installing New Seals
  • Tools - Rebuilt and Exchange Program for Tools
  • VIN Plate, Certification & Emission Label - Availability
  • VIN, Certification & Emission Labels - Availability
  • Cooling System - Approved Phosphate Free Anti-Freeze
  • Electrical System - Poor Pin/Ground Lug Connections
  • Intake Manifold Temperature Switch - Not Functional
  • Power Steering Pump - Flush Hoses After Replacing
  • Brakes - Objectionable Noise
    • Overview
    • General Information:
    • Front Axle Vibration Damper and Damping Plate Application Chart
    • Vibration Damper and Damping Plate Application Chart
  • Brake Pads - Proper Application of New Material Pads
  • Spark Plug - Recommeded Usage
  • Spark Plugs - Install With Threads Clean and Dry
  • A/C Compressor - Warranty Return Procedures
  • Tools - Compressor Seal Replacement
  • Front Brakes - Groaning Type Noise
  • Power Steering Gear - Diagnosis
  • Camshaft Drive Belt - Noise at 1800 RPM
  • Cylinder Head - Revised Torque Value and Procedure
  • Coolant Pump - Leaks
  • Cooling Fan Motor - Correct Positioning
  • Wheels - Unapproved Installation of 18 Inch Wheels
  • Tires/Wheels - Summer & Winter Summary
  • Tires/Wheels - Summer Recommendations
    • Overview
    • Tire Pressures 924S/944/Turbo/S/S2
    • Wheel Rim For Summer Tires, 944TURBO/S/S2
    • Tire Pressure, Tire and Wheels Model 968
    • Tire Pressure, Tire and Wheels, 911
    • Summer Tire Dimensions and Makes, 911
    • Tire Pressure, Tire and Wheels 928/S/S4/GT
  • Tires/Wheels - Summer Tire & Wheel Rim Summary
    • Overview
    • 944 S2
    • 911 Carrera 2 and 911 Carrera 4
    • 928 S4 and 928 GT
  • Tools - Special Wheel Balancing Adapter
  • Wheels - Non Approval of Chrome Plating Aluminum Wheels
  • Wheels - Retrofitting Unapproved 18 Inch Wheels
  • Tire/Wheel Rim - Latest Winter Recommendations
    • Overview
    • Tire Pressures
    • Collapsible Spare Tire Information
    • Recommended Winter Tires For Porsche 4 CYL. ENG. Cars
    • Winter Wheel Rim and Tire Sizes For Porsche 4 CYL. ENG. Cars
    • Survey of 4 CYL. Porsche Wheel Rims For Winter Tires
    • Recommended Winter Tires For Porsche 6 CYL. ENG. Cars
    • Winter Tire/Wheel Rim Summary and Tire Sizes For 6 CYL. ENG. Cars
    • Survey of 6 CYL. ENG. Porsche Wheel Rims For Winter Tires
    • Recommended Winter Tires For Porsche 8 Cylinder Engine Cars
    • Winter Wheel Rim and Tire Sizes For Porsche 8 Cylinder Engine Cars
    • Survey of Porsche Wheel Rims For Winter Tires - 928/S/S4/GT
  • Tires/Wheels - Installing Approved 17 Inch Wheels
  • Tires - Manufacturer Contact Information
  • Tires (VR-Rated Summer ) - Do Not Mix With ZR Rated
  • Tools - Tire Pressure Gauge With Correct Accuracy
  • Tires - Winter Tire Summary Supplement
  • Gas Cap Lock - Modifying
  • Leather Upholstery - Reconditioning
  • Lifting Roof Gear - Installing
    • Overview
    • A.Removal of Old Lifting Roof Parts:
    • B.Preparation For Installation:
    • C.Installing and Adjusting Elements:
  • Lifting Roof - Modification
  • Hydraulic Clutch - Pedal Stays Down/Air In the System
  • Battery - Diagnosing a Discharging Condition
    • Overview
    • 1. General Information
    • 2. Battery Service/General
    • 3. Vehicle Delivery Hints (See Delivery Check Sheet)
    • 4.0 Replacement Battery (Filled or DRY)
    • 5. Discharged Battery
      • Overview
      • 5.1 Preservation Charging
      • 5.2 Discharged and Sulfated Batteries
      • 5.3 Reference Values For Battery Discharge/Parking Time
    • 6. Battery Voltage Checking
      • Overview
      • 6.1 Battery Voltage Correction Values
      • 6.2 Checking Electrolyte Density
      • 6.3 Correction Values For Electrolyte Density
    • 7. Starting Capability (Load Test)
    • 8. Checking Constant Current Draw ( All Vehicle Types)
    • 9. Summary
    • Battery Maintenance Log Sheet
    • Battery Check Sheet
  • Battery - Revised With Vent Hose
  • Ignition Distributor - Revision and Marking
  • Exhaust System - Sulfur Like Smell
  • Electric Seat - Jammed in Backward Stop Position
  • Radio DIN Cable - Damaged During Removal
  • Radio Knobs - Broken
  • Radio - Discharged Battery/Alarm System Malfunction
  • Telephone - Installation and Operation
    • Overview
    • Wiring Installation 911 Carrera 2 and 911 Carrera 4
    • Wiring Installation, 944 Models From 85/2 (Coupe Only)
    • Wiring Installation, 928 S4 and 928 GT
  • Airbag Impact Sensors - Revised
  • Brakes - Pedal Pulsation/Vibration
  • Fuel/Ignition Modules - Use of Aftermarket Microchips
  • Horn Buttons - Repairing On Vehicles WIth Air Bags
  • Wiper Motor Cover - Revised
  • Wiper Motor Hole (In the Rear Hatch Glass) - Changed
  • Steering Wheel - Noise When Turning
  • Cabriolet Top & Trunk Compartment - Water Leaks
    • Overview
    • Water Test
    • Section A:Additional Water Drains
    • Section B:Trunk Area
    • Section C:Top Sealing
    • Section D:Door Window Adjustment
  • Cabrio Top - Water Leaks
  • Paint - Manual Supplements
  • Tools - Celette Collision Repair Systems
  • Air Bag - Notice of Deployment & Service Information
  • Air Bag - Notification of Deployment & Service
  • Air Bag - Scheduled Maintenance
  • Air Bag Warning Lamp ON, DTC 60 Set
  • Radio - Alarm Contact Installation With Replacement
  • Vehicle Security Codes - Requesting
  • Rear Lid Latch Assembly - Water Entry
  • CO Sample Pipe - Material and Mounting Change
  • Tools - System Tester 9288 Acronym Definitions
  • Wiper Blades - Correct Application
  • Windshield Cement - Mixing
  • Engine Lubrication - Oils That Minimize Carbon Build-Up
  • Engine - Approved Engine Oils
  • Engine - Porsche Approved Oils
  • A/T - Engine Vacuum Testing
  • A/T - How To Use A Pressure Gauge
  • A/T - Slipping or No-Shift/Metal Sealing Rings
  • A/T - Front Bushing Wear
  • A/T - Math Formulas Part I
    • Overview
    • Shift Speed and Pressure
    • Speedometer Ratios
  • A/T - Twenty Steps To Successful Repairs
  • A/T - Math Part II
  • A/T - Choosing the Right ATF
  • Engine Mount - Revised, Installation and Checking
  • Transmission Fluids - Specifications
  • Brake Vibration Damper - New Application Information
  • Vehicle - Year 2000 Hardware/Software Readiness
  • Suspension - Lowering Ride Height is Not Approved
  • Warranty - Recall Information Reporting Policy
  • Warranty - First Alignment & Convertible Top Checks
  • Tools - Wheel Alignment Equipment
  • Wheels/Tires - Winter - Tires/Wheels/Snow Chains
  • Wheels/Tires - Winter Wheels/Tires/Snow Chains
  • Radios/CD Players - Obtaining & Entering Security Codes
    • Overview
    • Alpine CD-2
    • Reno II Radio
    • Stuttgart Radio
  • Engine - Oil Pressure Too High
  • Hand Brake Shoe Retaining System - Correct Installation
  • A/C - Use of Correct Refrigerant
  • A/C - Refrigerent Oil Volume Capacities
  • Engine - Approved Engine Oils Overview
  • Tires - Summer Tire Summary
  • Engine - Approved Porsche A40 Engine Oils
  • Tires/Wheels - Handling Instructions After Damaged
  • Engine - Approved Engine Oil Specification
  • Computers/Controls - Component Diagnosis