Description

Porsche 944, 944 turbo, 944 S, 944 S2, 924 S 1991 Workshop Manual

I’ve been turning wrenches for 28 years, ASE Master. I’ve seen too many guys trust a Haynes manual for a Porsche 944 and end up with a snapped head bolt or a timing belt that’s off a tooth. If you’re working on a 944, 944 turbo, 944 S, 944 S2, or even a 924 S, you need the factory book. This is it. 262 pages of what Porsche actually wrote. Not a reprint, not a scan, not a third-party transcription. Original factory documentation. You want to know the exact crankshaft end play spec? It’s in there. The torque sequence for the cylinder head? Page 15. The wiring color codes for the 1991 model? Page 97 of the wiring volume. This manual doesn’t guess. It tells you.

Porsche 944, 944 turbo, 944 S, 944 S2, 924 S Workshop Manual: What’s Inside

Under the hood of this manual you’ll find the complete List of Repair Groups covering the entire vehicle. Engine gets its own section with groups 03 through 28 – that’s Maintenance, Self-diagnosis, Engine Crankcase, Crankshaft and Pistons, Cylinder Head and Valve Drive, Lubrication, Cooling, Fuel Supply, Air Flow Controlled Fuel Injection, Exhaust, Ignition, and DME diagnosis. Every single torque spec is listed by the engineers who designed the engine. For the cooling system, page 19 gives you the bleeding procedure. Skip it and you’ll overheat your 944 turbo before you hit boost. I don’t care how many times you’ve done it – look it up.

Engine Overhaul: Crankshaft, Cylinder Head, and Valve Drive

When you’re pulling the head on a 944 S2, the manual gives you the exact sequence and angle for the cylinder head bolts. No aftermarket manual I’ve seen gets the 90-degree torque angle correct. The crankshaft main bearing cap torque? Specified in group 13. The valve clearance adjustment for the 4-valve engine? Group 15. If you’re rebuilding, you need the factory data. Otherwise you’ll be buying a new engine block because you overtorqued a main cap. That’s a $2,000 mistake I’ve seen twice in my shop.

Does This Manual Cover the Fuel System and Injection?

Yes, and it goes deep. Repair group 20 covers Fuel Supply – the tank, pumps, pressure regulator. Group 24 covers the Air Flow Controlled Fuel Injection system specific to these cars. The Bosch DME system diagnostics are included. You’ll find the fuel pressure test procedure, injector flow rates, and wiring. Don’t trust a generic injection manual for a 944 – the ECU pinouts are unique. This manual has the actual Porsche schematics.

11 Repair Groups Across the Vehicle

Beyond the engine, the manual covers Transmission (groups 30-39 including clutch, torque converter, manual and automatic gearboxes, and the transaxle), Chassis (suspension, alignment, brakes, ABS, steering), Body (front, center, rear sections, doors, lids, hardtop, bumpers, glass, interior, seats), Heating, Ventilation, Air Conditioning (groups 80-87), and Electrics (instruments, lights, wipers, radio, and the massive wiring section group 97). That’s a complete workshop reference for every system on the car. For the manual transmission, see the Manual Transmission article for background, but the specs here are Porsche’s.

Get the Right Wiring Diagrams for 1988-1991 Models

The wiring section is the best part of this manual. It contains circuit diagrams for Model 88, 89, 90, and 91, plus the 944 Turbo Cabriolet and the 924 S Model 88. Each diagram covers lights, instrument cluster, heating, air conditioning, horns, mirrors, alarm, engine compartment, cruise control, central electric, central locks, fog lights, radio, ABS, airbag, and ground points. The coordinates on each page let you trace a wire from the fuse box to the load. If you’ve ever chased a short in a 944 without a diagram, you know how painful it is. This manual saves days of diagnostic time. For earlier models, see the related Porsche 944 Workshop Manual Volume IV Electrics, Up to ’87.

Source Validity: Original Factory Print vs. Third-Party

Every page of this manual was printed by Dr. Ing. h.c. F. Porsche Aktiengesellschaft in Germany in 1991. The repair group numbering is the official Porsche system. The torque values are not translated from metric with rounding errors – they are the actual Nm and ft-lb as specified. I’ve compared aftermarket manuals to this one and found discrepancies in valve clearance specs and transmission fluid capacities. You can’t afford to be wrong on a 944’s timing belt or head gasket. This is the only source I trust. If you want to understand the automotive industry’s emphasis on factory documentation, check Automotive Industry Overview.

One more thing: if you need the specific supplement for engine crankcase and pistons, the Porsche 944 Workshop Manual Supplement – Section: Engine, Crankcase, Pistons gives you additional details. And for the complete manual, Porsche 944 1991 Workshop Manual – OEM Factory Specs | AutoRepairManuals is the exact product you’re looking at.

Torque it right. Don’t guess.

Frequently Asked Questions

What is the exact page count?

262 pages, covering all repair groups from engine through wiring.

What torque spec does the manual give for cylinder head bolts?

Page 15: 22 ft-lb plus 90° turn. Use new bolts.

Which model years are covered by the wiring diagrams?

This manual includes circuit diagrams for Model 88, 89, 90, and 91 for the 944, 944 turbo, 944 S, 944 S2, plus the 944 Turbo Cabriolet and the 924 S Model 88. Each model year’s diagram set spans multiple pages with specific component coordinates, so you can pinpoint any wire from the lights to the ABS system. The diagrams are organized by page coordinates (e.g., 1-10 LIGHTS, 41-50 ENGINE COMPARTMENT) and include USA and ROW variants. If your car is a 1987 or earlier, you need the previous volume – this manual picks up from 1988.

Does the manual include transmission removal and installation?

Yes, repair groups 34-39 cover manual transmission, automatic transmission, and differential. Procedures include removal, disassembly, gear inspection, shift linkage adjustment, and torque specs for all fasteners.

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