Faults
59
Carefully read the Operating Instructions before starting any work!
This is especially valid for the chapter on General Safety Instructions
and the safety instructions in each of the chapters.
Fault RemedyPossible cause
Engine does not start
or poorly starts in cold
condition
D Spark plug faulty
D Ignition cable faulty
D Ignition coil faulty
D Ignition timing incorrectly set
D Starter turns slowly
D Check quality of gas
D Remedy from manufacturer ser
vice
D Battery with insufficient charge
or damaged
D Voltage drop between battery
and starter too high
Rough idling with en
gine warm,
misfiring
D Spark plug faulty
D Ignition cable faulty
D Ignition coil faulty
D Ignition timing incorrectly set
D Valve clearance not OK
D Zero pressure regulator of gas supply
not correctly set or faulty
D Insufficient compression in cylinder or
more than 3-4 bar pressure difference
between the cylinders
D Remedy from manufacturer ser
vice
Engine speed fluctua
tions during operation
D Spark plug faulty
D Ignition cable faulty
D Ignition coil faulty
D Ignition timing incorrectly set
D Shutoff solenoid valve of gas supply
closed/does not open
D Tachometer faulty
D Gas pressure regulator faulty
D Oxygen sensor faulty
D Remedy from manufacturer ser
vice
Poor performance D Spark plug faulty
D Ignition cable faulty
D Ignition coil faulty
D Ignition timing incorrectly set
D Throttle valve not in full throttle position,
actuation linkage sticks,
throttle valve incorrectly adjusted
D Zero pressure regulator of gas supply
not correctly set or faulty
D Gas metering valve faulty
D Gas/air mixture too rich or too lean
D Too much power is demanded from the
engine than it can produce
D Gas quality does not meet the regu
lations
D Cross section of oxygen regulation
valve is not set to the current gas quality
D Oil level in oil pan too high
D See "Fluids and Lubricants..."
D Remedy from manufacturer ser
vice
D Check whether the guide tube is
correctly installed and the cor
rect oil dipstick is being used
D If coolant is discovered in the
engine oil, check cylinder head
gasket, cylinder liner gasket and
piston rings
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