Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
Idle speed control valve defective
- Check the valve
The fuel starter valve is faulty
- Check the valve
The fuel starter valve is leaking due to a defective gasket
- Check the valve for leaks
The air flow meter shut-off valve is set incorrectly
- Check the position of the shut-off valve
The shut-off valve or distribution piston is obstructed
- Check the stroke of the shut-off valve and the distribution piston
The engine is sucking in extraneous air
- Inspect all hoses and their connections
A warmed-up engine does not start at all or starts poorly
Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
The air flow meter shut-off valve is set incorrectly
- Check the position of the shut-off valve
The shut-off valve or distribution piston is obstructed
- Check the stroke of the shut-off valve and the distribution piston
Leaky injectors and low injector opening pressure
- Have your injectors checked at a workshop
Low fuel pressure in the system
- Measure the pressure in the workshop
Too rich mixture at idle speed
- Adjust CO levels
Too lean mixture at idle speed
- Adjust CO levels
Cold engine vibrates at idle
Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
Idle speed control valve defective
- Check the valve
The fuel starter valve is leaking due to a defective gasket
- Check the valve for leaks
The air flow meter shut-off valve is set incorrectly
- Check the position of the shut-off valve
The engine is sucking in extraneous air
- Inspect all hoses and their connections
The air flow meter shut-off valve is set incorrectly
- Check the position of the shut-off valve
Cold engine runs rough when accelerating
The fuel starter valve is faulty
- Check the valve
Throttle switch defective
- Check the switch
Warm engine vibrates at idle
Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
Idle speed control valve defective
- Check the valve
The shut-off valve or distribution piston is obstructed
- Check the stroke of the shut-off valve and the distribution piston
The engine is sucking in extraneous air
- Inspect all hoses and their connections
Leaky injectors and low injector opening pressure
- Have your injectors checked at a workshop
Low fuel pressure in the system
- Measure the pressure in the workshop
Backfires in the intake manifold
Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
Low fuel pressure in the system
- Measure the pressure in the workshop
Backfires in the exhaust system
Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
The fuel starter valve is leaking due to a defective gasket
- Check the valve for leaks
Leaky injectors and low injector opening pressure
- Have your injectors checked at a workshop
Fuel pump failure
- Check the fuel pump
The engine runs intermittently and stalls
Uneven fuel supply from the pump
- Measure the fuel supply from the pump
Incorrect fuel pressure
- Measure and adjust fuel system pressure
Low effective engine power
Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
The fuel starter valve is leaking due to a defective gasket
- Check the valve for leaks
The shut-off valve or distribution piston is obstructed
- Check the stroke of the shut-off valve and the distribution piston
The engine is sucking in extraneous air
- Inspect all hoses and their connections
Leaky injectors and low injector opening pressure
- Have your injectors checked at a workshop
Low fuel pressure in the system
- Measure the pressure in the workshop
Weak fuel supply from the pump
- Measure the fuel supply from the pump
The throttle valve does not move to the "Full Throttle" position
- Adjust the "throttle" cable
The engine continues to run after the ignition is turned off
The fuel starter valve is leaking due to a defective gasket
- Check the valve for leaks
The air flow meter shut-off valve is set incorrectly
- Check the position of the shut-off valve
The shut-off valve or distribution piston is obstructed
- Check the stroke of the shut-off valve and the distribution piston
The air flow meter shut-off valve is set incorrectly
- Check the position of the shut-off valve
Increased fuel consumption
Defective or unadjusted air-fuel mixture corrector
- Check the air-fuel mixture corrector and the control unit
The fuel starter valve is leaking due to a defective gasket
- Check the valve for leaks
Leaky injectors and low injector opening pressure
- Have your injectors checked at a workshop
A warm engine has an increased idle speed
Idle speed control valve defective
- Check the valve