Engine Dieseling

Problem

Possible cause

Remedy

Page

Engine diesels (runs after ignition switch is tuned off)

EFI system problems Incorrect ignition timing EGR system faulty

Repair as necessary Reset timing Check EGR system

IG-17, 22 EC-8, 24

AFTER FIRE, BACKFIRE

Problem

Possible

remedy

Page

Muffler explosion (after fire) on deceleration only

Deceleration fuel cut system always off

Check EFI (fuel cut) system

Muffler explosion (after fire) all the time

Air cleaner clogged EFI system problem Incorrect ignition timing

Check air cleaner Repair as necessary Reset timing

MA-4 IG-17, 22

Engine backfires

EFI system problem

Vacuum leak

• Intake manifold

• Throttle body

• Brake booster line

Air suction between air flow meter and throttle body

Insufficient fuel flow

Incorrect ignition timing

Incorrect valve clearance

Carbon deposits in combustion chambers

Repair as necessary

Check hoses and repair as necessary

Repair as necessary

Troubleshoot fuel system Reset timing Adjust valve clearance Inspect cylinder head

Fl -11 IG-17, 22 EM-11, 16 EM-74, 110

EXCESSIVE OIL CONSUMPTION

Problem

Possible cause

Remedy

Page

Excessive oil consumption

Oil leak

PCV line clogged Piston ring worn or damaged Valve stem and guide bushing worn Valve stem oil seal worn

Repair as necessary Check PCV system Check rings

Check valves and guide bushing Check seals

EM-185, 203 EM-75, 111

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  • ermias
    How to fix a 91 mr2 backfire?
    9 years ago

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