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 codeOpel Z14XEP
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Displacement1.4 L, 1,364 cm3 (83.24 cu in)
Fuel systemMultipoint fuel injection (MFI)
Power adderNone
Power output90 PS (66 kW; 89 HP) at 5,600 rpm
Torque output125 Nm (12.7 kg·m; 92.2 ft·lb)
Firing order1-3-4-2
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 alloyCast-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:INTAKE27.90-28.10 mm (1.0984-1.1062 in)
EXHAUST24.90-25.10 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 plugBosch FQR8LEU2
Spark plug gap0.85-0.95 mm (0.0334-0.0374 in)
Spark plug tightening torque25 Nm (2.55 kg·m; 18.45 ft·lb)

Vehicle applications

ModelYears Produced
Opel / Vauxhall Astra G2003-2006
Opel / Vauxhall Corsa C2003-2009
Opel / Vauxhall Astra H2004-2009
Opel / Vauxhall Tigra B2004-2009
Opel / Vauxhall Meriva2004-2009
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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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.)

    • I had the same problem, hard to start, stalling, rough idle, and i just changed the piston rings and honed the block, runs like new

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