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Subaru IMPREZA 1999 Service Manual – Factory Specs You Can Trust

I’ve seen more stripped threads and mis-timed engines from guys using aftermarket manuals than I care to count. They grab a generic PDF off some forum, skip the critical steps, and end up with a car that runs worse than when it rolled in. If you’re working on a Subaru IMPREZA 1999 Service Manual – and I mean actually working, not guessing – you need the OEM book. This is the one FUJI HEAVY INDUSTRIES LTD. wrote for their own technicians. It’s 2196 pages of what Subaru decided was necessary for correct maintenance and repair. Not condensed, not rewritten by some guy in a basement. This is the original service manual, scanned from the factory print.

Page 1 states plainly: “When replacement of parts during repair work is needed, be sure to use SUBARU genuine parts.” That’s not a suggestion. It’s a warning about safety and performance. This manual doesn’t mess around with “maybe this will work” advice. It gives you the exact procedure, the correct torque, and the right sequence. For a 1999 Impreza, that means everything from the EJ series engine to the AWD system. The table of contents is laid out in sections: ENGINE, TRANSMISSION AND DIFFERENTIAL, MECHANICAL COMPONENTS, BODY, ELECTRICAL, DIAGNOSTICS, and WIRING DIAGRAM. If you need to rebuild the front suspension, you jump to the SUSPENSION chapter under MECHANICAL COMPONENTS. If you’re chasing a check engine light, the DIAGNOSTICS section has OBD-II procedures specific to this car.

Engine Section and Cooling System Coverage

The ENGINE SECTION alone covers over a dozen subsystems. You get EMISSION CONTROL AND VACUUM FITTING, ON-CAR SERVICES, ENGINE LUBRICATION, ENGINE COOLING SYSTEM, FUEL INJECTION SYSTEM, FUEL SYSTEM, EXHAUST, CLUTCH, and ENGINE MOUNTING. Each chapter has the kind of detail that saves you from pulling a cylinder head twice. For example, the COOLING SYSTEM chapter includes the thermostat replacement sequence and the correct coolant capacity for both the radiator and the heater core. No guesswork about which hose clamp goes where. The manual even tells you which special tools Subaru requires for the water pump pulley removal. If you’ve ever fought a seized pulley bolt on a 2.2L, you know why that matters.

Fuel system work on these cars can be tricky because of the returnless rail and the integrated pressure regulator. The FUEL INJECTION SYSTEM chapter has the step-by-step for injector removal, pressure test procedures, and the exact O-ring part numbers. Page 3 of the manual explains how to use the book itself: each area is marked with a title index number so you don’t waste time flipping back and forth. That organizational system is gold when you’re elbow-deep in the engine bay with coolant dripping on your arm.

Does the Manual Cover the Transmission and AWD System?

Yes – and it treats the manual transmission, automatic, and the AWD system as separate chapters. The TRANSMISSION AND DIFFERENTIAL SECTION includes MANUAL TRANSMISSION AND DIFFERENTIAL, AUTOMATIC TRANSMISSION AND DIFFERENTIAL, TRANSMISSION CONTROL SYSTEM, and AWD SYSTEM. If you’re swapping a 5-speed into a car that came with an auto, you’ll need the wiring pinouts and the transfer case specs. That information is here, straight from Subaru. The AWD SYSTEM chapter covers the viscous coupling and the rear differential identification. I’ve seen guys ruin a limited-slip diff by using the wrong friction modifier. This manual lists the required fluid type by viscosity grade and capacity.

3 Systems You’ll Find in the Diagnostics Section

The DIAGNOSTICS SECTION isn’t a generic OBD-II code list. It has six dedicated areas: ENGINE COOLING SYSTEM, ON-BOARD DIAGNOSTICS II SYSTEM, AUTOMATIC TRANSMISSION AND DIFFERENTIAL, BRAKES, SUPPLEMENTAL RESTRAINT SYSTEM, and BODY ELECTRICAL SYSTEM (CRUISE CONTROL). For the 1999 Impreza, the ECU can throw soft codes that don’t turn on the CEL but still affect driveability. The manual walks you through the diagnostic modes, the connector pin locations, and the procedure to read live data. No need to buy a fancy scan tool – the steps use the Subaru select monitor or a simple jumper wire.

Get the Right Torque Specs from the OEM Source

Page 1 carries a safety notice: “The safety of the serviceman and the safe operation of the vehicle would be jeopardized if he used any service parts, consumables, special tools and work procedure manuals which are not approved or designated by SUBARU.” That’s not legal jargon; it’s a warning backed by real engineering. The torque specs in this manual are the ones Subaru tested. For the cylinder head, it’s a multi-angle torque sequence with specific angles. For the suspension, it’s the exact foot-pounds for the strut-to-knuckle bolts. You won’t find those numbers in a Chilton’s or Haynes. When I’m torquing head bolts on a 2.5L SOHC, I pull this manual off the shelf. Period.

Suspension and Steering: Factory Procedures Only

Under MECHANICAL COMPONENTS, the SUSPENSION chapter includes both the front MacPherson strut and the rear multi-link setup. The steering chapter covers the rack-and-pinion gearbox, the power steering pump, and the hydraulic lines. If you’re installing aftermarket springs, you still need the factory ride height specs and the bushing tightening sequence with the vehicle weight on the wheels. That’s in the manual. I’ve had three different 1999 Imprezas come through my shop with loose sway bar link nuts because someone used a generic torque chart. Don’t be that guy.

Wiring Diagrams and Electrical Systems

The WIRING DIAGRAM SECTION is a separate volume in the original set. This manual includes the full wiring diagram for the 1999 Impreza, covering the ENGINE ELECTRICAL SYSTEM and the BODY ELECTRICAL SYSTEM. If you’re troubleshooting a no-start or a dead power window, you can trace the circuit from the fuse box to the component. The diagrams use the same color codes as the factory harness, so you don’t need to translate aftermarket abbreviations.

How many pages does this manual have?

2196 pages.

Why should I buy an OEM manual instead of a third-party version?

Because aftermarket manuals often omit critical steps, use generic torque values, and skip the diagnostic flowcharts. This one was written by Subaru’s own engineers. It includes the factory safety notices, the special tool part numbers, and the exact procedures that dealer techs used. When you’re working on a Subaru engine with aluminum heads, a wrong torque can warp the head gasket surface. The OEM manual prevents that. It also covers the AWD system in depth – something aftermarket books barely touch. If you plan to keep your Impreza on the road for another ten years, this is the only manual that will get you there without mystery failures.

If you’ve been fighting a 1999 Impreza that surges at idle, or you’re staring at a leaking head gasket, stop guessing. Access the Factory Manual and get the job done right the first time. Use the table of contents to jump directly to the section you need – ENGINE, COOLING, FUEL, TRANSMISSION, SUSPENSION – and follow the procedure as written. Your car will thank you, and so will your wallet.

Related manuals: SUBARU IMPREZA 1993 Service Manual – Section: Electrical Section · Subaru Impreza Service Manual · SUBARU Impreza 1994 Service Manual – Section: Engine Sction

External reference: Automotive Industry Overview · Automotive Industry Overview