ZEST AND BOLT - page 59

Revotron 1.2T
12
2. Engine Idle Problems
Condition
Possible Cause
Remedy
Engine Starts but does not idle
Faulty ETC unit.
Perform Diagnosis test. Replace
as necessary.
Clogged or faulty fuel regulator
or pump.
Check fuel system components,
repair or replace as necessary.
Incorrect manifold absolute
pressure (MAP) sensor signal
input.
Check for leakage at sensor.
Perform diagnostic test.
Engine idles erratically
Disconnected
or
leaking
vacuum line or vacuum leak at
inlet manifold.
Inspect all vacuum lines and
connections. Repair or replace as
necessary.
Faulty ETC unit.
Perform diagnostic test. Replace
as necessary.
Incorrect valve / ignition timing.
Check timing system components
and repair or replace as
necessary.
Clogged or faulty fuel regulator
or pump.
Check fuel system components,
Repair or replace as necessary.
Improper firing order.
Check ignition system and fuel.
3. Poor Engine Performance
Condition
Possible Cause
Remedy
Maximum RPM -low
Insufficient
battery
voltage/charge - test battery
and charging system.
Clean
and
tighten
battery
connections
Jump start engine.
Battery or charging system
component faulty. Replace as
necessary.
Obstructed air filter or air inlet
Clean or replace air filter or inlet.
Improper
grade
or
contaminated fuel
Rush fuel system with fresh,
clean, fuel of the correct type.
Replace fuel filter.
Faulty spark plugs, wires, or
ignition coil
Check
ignition
system
components for proper operation.
Replace as necessary.
Malfunctioning
engine
management
system
component
Perform engine management
system
diagnostic
test
as
described in this section of the
manual.
Clogged or faulty fuel filter,
fuel regulator, fuel line, or fuel
pump
Check fuel system components,
repair or replace as necessary.
Incorrect crank angle signal
Check sensor gap and adjust to
1.4 ± 0.4mm
Clogged
or
faulty
fuel
injector(s)
Check fuel injector operation.
Replace as necessary.
Improper firing order
Check ignition system and fuel
injector connections. Rectify as
necessary.
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