Contents: General characteristics ⬇ Idle speed settings ⬇ Fuel pressure (the vacuum hose of…⬇ Tightening torques, Nm ⬇
General characteristics
Injection system type:
- C16 NZ, C16 NZ2, X16SZ and C18NZ - Multec Central Fuel Management System
- 20 NE, C20 NE and 20 SEH, (models before 1990) — Motronic M 4.1
- 20 NE From 20 NE and 20 SEH, (models since 1990) — Motronic M1.5
- 20 XEJ and C20 XE, (models before 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 number*
- Leaded - 98 RON
- Unleaded (see Section 5)* — 95 RON
* Note: Models with a catalytic converter (engines with a "C" or "X" prefix) must be operated on unleaded gasoline only.
Idle speed settings
Idle speed:
- 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
- Models with manual transmission - 880±80 rpm
- Models with automatic transmission - 830±80 rpm
Note: Idle speed adjustment is not possible on these models, provided for information only.
Idle mixture (cO content)
- 20 NE and 20 SEH - 1.0 max
- 20XEJ — 0.7-1.2%
- All other models - 0.3% (at 2800-3200 rpm)
Fuel pressure (the vacuum hose of the regulator is connected)
- Multec - 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:
- Flow - 2.3-2.7 bar
- Return - 0.3-1.5 bar
Motronic 1.5:
- Flow - 1.8-2.2 bar
- Return - 0.3-1.5 bar
Tightening torques, Nm
All specifications are the same as for carbureted models, except for the following.
[Article published on the website OpelBook]
- Bracket, tank inlet valve to cooling flange - 8
- Fuel distributor pipe to intake manifold - 8
- Fuel Flow Arrestor - 20
- Fuel Injector Holder - 3
- Fuel pressure regulator - 2.5
- Fuel Pump Clamp - 4
- Idle Air Control Stepper Motor - 2.5
- Knock sensor (X16 SZ) to block - 13
- Oxygen sensor - 30
- Throttle Body Mount - 20
- Throttle body top to bottom - 6
- Throttle Potentiometer - 2
- Air damper housing to intake manifold - 9
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