The MkIII Jetta TDI was the third generation Jetta and, like previous generations, shared its platform with the MkIII Golf. The MkIII cars are also referred to as “A3 Chassis” Jetta & Golf. However, though they shared most components, the MkIII Golf was not available in Diesel.
The MkIII Jetta would have the first TDI ever introduced into the US market. Earlier motors were not turbocharged or used indirect injection, rather than the TDI – “Turbocharged Direct Injection” – series motor. While identical in specification, there were two 1.9L TDI engines equipped in the MkIII Jetta, the AHU and the 1Z. (Canada got an AAZ motor early on too, but that used indirect injection.) The MkIII Jetta was only available with a 5-speed manual.
Engine
As mentioned, there were two TDI engines used in the MkIII Jetta, the 1Z and AHU. The 1Z was primarily used in 1996 models, AHU in 1997 and later. The engine identifiers (“engine code” and “serial number”) are located on the front of the cylinder block between the Diesel injection pump and the exhaust, its also on a sticker on the toothed belt guard showing the “engine code” and “serial number” as well as on the vehicle data plate.
Engine Code: AHU or 1Z
Displacement: 1896 cu in.
Horsepower: 90HP @ 4000 RPM
Torque: 149 ft/lb @ 1900 RPM
Injection Style: Direct Injection, Rotary Pump, Electronic
Bore: 79.5 mm
Stroke: 95.5 mm
Compression Ratio: 19.5 : 1
Firing Order: 1-3-4-2
Transmission
The only transmission available in the MkIII Jetta TDI was a 5-speed manual with a hydraulically operated clutch with a release lever.
Maintenance
Oil Change: 10,000 Miles
Oil Specification: 505.00 5w40 or 5w30
Timing Belt Interval: 60,000 miles, optionally replacing the water pump if necessary (as the water pump is not driven by the timing belt directly, water pump failure is not catastrophic to the engine)
Common Issues
Limp Mode Due to ECU Boost Hose Deterioration
Intake Manifold Clogging
Limp Mode Due to N75 Failure
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