2751143 - Z53 MISFIRE ERROR

The diagnostic equipment signals the following error: Misfire
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Visually check on the instrument panel that the I.E. fault warning light is not flashing while the car is drivingContinue to Step 1I.E. fault warning light flashingSee table   K48 
1CHECK ERRORAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or Examiner Plus) and record the errors and environmental parameters.Connect the diagnostic equipment (Examiner or Examiner Plus) and record the errors and environmental parameters.End of diagnosisThe 'Upstream Lambda signal' error is presentSee table   Z56 
The 'Mixture strength' error is presentSee table   Z50 
The 'Misifre in cylinder X' error is presentSee table   Z54 
The '(General) Misfire', 'Catalyzer and/or 'Downstream Lambda signal' errors only are presentContinue to Step 2
Other errors are presentIdentify and eliminate the cause of the problem.Continue to Step 11
2CONTROL UNIT CIRCUIT CHECKAll OKProblems metOperation
Visually inspect the condition of the engine management control unit wiring, connections and earth.There should be no faultsContinue to Step 3Faults in the control unit electrical circuitRestore the correct connections, if necessary, replace the affected components if necessary ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT )Continue to Step 11
3CHECK ON FUEL PRESSUREAll OKProblems metOperation
Check that the fuel system pressure is correct Op.   0510C10  Continue to Step 4Pressure not correctRestore the correct pressure; if necessary, replace the faulty components.Continue to Step 11
4FUEL QUALITY CHECKAll OKProblems metOperation
Check the quality of the fuel, making sure that there is no water or other impuritiesContinue to Step 5Impurities presentClean the tank Op. 1040A24and introduce new fuel.Continue to Step 10
5INTAKE AND EXHAUST SYSTEM LEAKAGE CHECKAll OKProblems metOperation

Check the exhaust system visually and by listening. In particular, check that there are no leaks downstream of the MAP/flow meter sensor, also taking into consideration:

  • blow-by;
  • canister circuit;
  • brake servo vacuum pipes;
  • Injector O-Rings
Continue to Step 6There are leaksRestore the correct seal for the exhaust system, if necessary, replace the components involved. Continue to Step 11
6ENGINE PROBLEMS CHECKAll OKProblems metOperation

Check that there are no problems with the engine. In particular, check:

  • cylinder compression correct ;
  • correct engine timing
  • correct rpm sensor position
  • gap between rpm sensor and flywheel within permissible limits
  • no visible faults on the flywheel, such as broken or chipped teeth
Continue to Step 9Engine timing incorrectEnsure engine timing is correctContinue to Step 7
Rpm sensor incorrectly positionedReposition the sensor correctly.Continue to Step 7
Flywheel defectiveReplace the flywheel Op. 1024A28Continue to Step 7
Compression insufficientContinue to Step 8
7FLYWHEEL LEARNINGAll OKProblems metOperation
Carry out the flywheel learning procedure See Test   1024A  Flywheel self-learning Continue to Step 11
Cylinders/piston rings wornRenew the seal.Continue to Step 10
8CHECK ON CAUSE OF INSUFFICIENT COMPRESSIONAll OKProblems metOperation
Carry out R/R on head to check the valve sealCheck the condition of the cylinders/piston ringsContinue to Step 9Insufficient valve sealOverhaul the cylinder head Op.   1016E10  Continue to Step 7
Cylinders/piston rings wornRenew the seal.Continue to Step 7
9KINEMATIC MECHANISM CHECKSAll OKProblems metOperation

Check that the kinematic mechanism is not oscillating by road testing the vehicle. In particular:

  • clutch not jerking;
  • couplings/bearings not faulty;
  • engine mountings and supports not faulty;
  • suspension loading correct;
  • wheel balancing correct
Continue to Step 10Clutch jerkingReplace the clutch Op.   1810A20  Continue to Step 11
Couplings, bearings, mountings or supports faultyReplace the components involved.Continue to Step 11
Front suspension not loadedReplace the shock absorber Op.   4410A12  Continue to Step 11
Wheels not balancedBalance the tyres Replace the faulty tyres if necessaryContinue to Step 11
10INDIVIDUAL CYLINDER ERROR CHECKAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or Examiner Plus) Check for the presence of 'Misfire at cylinder X' errorEnd of diagnosisError present in at least 1 cylinderReferring to the cylinders concernedSee table   Z54 
Error not present at a specific cylinderReferring to all the cylinders in successionSee table   Z54 
11ERROR CANCELLING AND CHECKINGAll OKProblems metOperation
Use a tester to cancel the errors in the control unit.Road test the vehicle and check that the error does not occur againContinue to Step 12The fault persistsContinue to Step 0
12Continue as instructed by the testerAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis