Opel Z14XEP

Opel Z14XEPThe Opel Z14XEP is a 1.4 l (1,364 cc, 83.24 cu-in) straight-four 4-stroke natural aspirated gasoline small-displacement engine from the second generation of the GM Family O Ecotec engines, developed by Opel, at the time a subsidiary of General Motors. The engine was manufactured from 2003 to 2010.

The Opel Z14XEP engine uses a light-weight cast-iron engine block with a cast-iron crankshaft and aluminum head with dual chain-driven overhead camshafts (DOHC) and four valves per cylinder (16 valves in total). This engine used TwinPort technology – twin intake ports with a choke closing one of the ports at low RPM, providing strong air swirl pattern for higher torque levels and better fuel economy. The engine used ECU Bosch ME7.6.1 or Bosch ME7.6.2.

Bore and stroke are 73.4 mm (2.89 in) and 80.6 mm (3.17 in), respectively. Compression ratio rating is 10.5:1. The Z14XEP engine produces 90 PS (66 kW; 89 HP) at 5,600 rpm of maximum horsepower and 125 Nm (12.7 kg·m; 92.2 ft·lb) at 4,000 rpm of peak torque.

The breakdown of the engine code is as follows:

  • Z – Euro 4 engine
  • 14 – 1.4 Liter displacement
  • X – Comression ratio from 10 to 11.5:1
  • E – Multi Point Fuel Injection system
  • P – Increased power

General information

Engine Specifications
Engine code Opel Z14XEP
Layout Four stroke, Inline-4 (Straight-4)
Fuel type Gasoline (petrol)
Production 2003-2010
Displacement 1.4 L, 1,364 cm3 (83.24 cu in)
Fuel system Multipoint fuel injection (MFI)
Power adder None
Power output 90 PS (66 kW; 89 HP) at 5,600 rpm
Torque output 125 Nm (12.7 kg·m; 92.2 ft·lb)
Firing order 1-3-4-2
Dimensions (L x W x H):

Cylinder block

The engine used a cast-iron cylinder block and a cast-iron crankshaft five-bearings supported system. Bore and stroke are 73.4 mm (2.89 in) and 80.6 mm (3.17 in). Compression ratio rating is 10.5:1.

Cylinder block
Cylinder block alloy Cast-iron
Compression ratio: 10.5:1
Cylinder bore: 73.4 mm (2.89 in)
Piston stroke: 80.6 mm (3.17 in)
Number of piston rings (compression / oil): 2 / 1

Cylinder head

The cylinder head is made of an aluminum alloy. The Z14XEP engine has chain-driven dual overhead camshafts with TwinPort technology. Valves are actuated via roller finger followers with hydraulic tappets.

Cylinder head
Cylinder head alloy: Aluminium
Valve Arrangement: DOHC, chain-driven
Valves: 16 (4 valves per cylinder)
Valve timing: INTAKE
Valve head diameter: INTAKE 27.90-28.10 mm (1.0984-1.1062 in)
EXHAUST 24.90-25.10 mm (0.9803-0.9880 in)

Head tightening procedure and torque specs:

  • Step 1: 25 Nm (2.5 kg·m, 18.4 ft·lb)
  • Step 2: Turn all bolts 60°
  • Step 3: Turn all bolts 60°
  • Step 4: Turn all bolts 60°

Maintenance data

Oil system
Oil consumption , L/1000 km (qt. per miles) up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30, 5W-40, 10W-30, 10W-40
Oil type API SG / CD
CCMC G4 / G5
Engine oil capacity (Refill capacity) With filter change 3.5 l
Oil change interval, km (miles) 30,000 (18,000)
Ignition system
Spark plug Bosch FQR8LEU2
Spark plug gap 0.85-0.95 mm (0.0334-0.0374 in)
Spark plug tightening torque 25 Nm (2.55 kg·m; 18.45 ft·lb)

Vehicle applications

Model Years Produced
Opel / Vauxhall Astra G 2003-2006
Opel / Vauxhall Corsa C 2003-2009
Opel / Vauxhall Astra H 2004-2009
Opel / Vauxhall Tigra B 2004-2009
Opel / Vauxhall Meriva 2004-2009
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.


    • It is still available. It can be found on the newer Opel Astra J, A14NET 140/120 hp, it’s identical to the z14xep engine except now it has a turbo and a different exhaust manifold.

  1. Hi I have a Opel Corsa essentia ,it has a oil leak , from timing case cover..or maybe oil pressure switch ..tell me how to sort it out .cell 0662294501

    • Try the torque settings first to see if they are spot on , that’s what I shall do . but I don’t know the order they are in .regards

  2. O have Opel Corsa Essentia 1.4. Rough starts, fluctuate idling and then starts hunting and sometimes cuts out stop. Please assist. Regards

  3. Please can someone tell me the correct fuel pressure for this engine? Thank you. (It’s on a Twintop cabriolet.)

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