General characteristics
Type of injection system:
- C16 NZ, C16 NZ2, X16SZ and C18NZ - Multec central fuel injection system
- 20 NE, C20 NE and 20 SEH, (models before 1990) - Motronic M4.1
- 20 NE C20 NE and 20 SEH, (models since 1990) - Motronic M1.5
- 20 XEJ and C20 XE, (models up to 1993) - Motronic M2.5
- C20 XE (models since 1993) - Motronic M2.8
- X20XEV — Simtec 56.1
Fuel tank capacity:
- All models - 63.0±2 liters
Fuel octane*
- Leaded - 98 RON
- Unleaded (see Section 5) * — 95 RON
*Note: Models with catalytic converter (motors with prefix "WITH" or "X") must only be operated with unleaded petrol.
Idle settings
Idle frequency:
- C16 NZ and X16 SZ - 850±80 rpm
- C16NZ2 - 880 + 80 rpm
- 20 NE, C20 NE and 20 SEH - 800±80 rpm
- 20 XEJ and C20 XE - 940 + 80 rpm
- X20XEV - 850±160 rpm
C18NZ
- Manual transmission models - 880±80 rpm
- Models with automatic transmission - 830±80 rpm
Note: Idle speed adjustment is not available on these models and is for information only.
idle mixture (CO content)
- 20 NE and 20 SEH - 1.0 maximum
- 20XEJ — 0.7-1.2%
- All other models - 0.3% (at 2800-3200 rpm)
Fuel pressure (regulator vacuum hose connected)
- Multitec - 0.76 bar
- Motronic - 2.5 2.0-2.2 bar
- Motronic - 2.2 - 2.7 bar
- Simtec 56.1 - no data
Motronic 4.1:
- Feed - 2.3-2.7 bar
- Return - 0.3-1.5 bar
Motronic 1.5:
- Feed - 1.8-2.2 bar
- Return - 0.3-1.5 bar
Tightening torques, Nm
All specifications are the same as those for carburetor models, except for the following.
- Bracket, tank inlet valve to cooling flange - 8
- Fuel distributor pipe to intake manifold - 8
- Fuel flow damper - 20
- Fuel injector holder - 3
- Fuel pressure regulator - 2.5
- Fuel pump clamp - 4
- Stepper motor air control in cold mode. stroke - 2.5
- Knock sensor (X16 SZ) to the block - 13
- Oxygen sensor - 30
- Throttle body mount - 20
- Throttle body top to bottom - 6
- Throttle Potentiometer - 2
- Air damper cover to intake manifold - 9
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