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Poor acceleration
Rotate the rubber sleeve with the right hand. The engine speed cannot increase immediately, and there is hysteresis, and the
acceleration is slow; you can refer to the following diagnosis process to troubleshoot the cause of the fault.
Poor
acceleration
Check the
ignition timing
N
The engine is
returned to the
factory to adjust
the timing
Y
Check
whether the
intake system
is leaking
Y
Repair or
replace
N
Check if the air
filter element is
blocked
Y
Clean up or
replace
N
Check the three-
in-one sensor
N
Clean up or
replace
Y
Check fuel
pressure
N
Check whet her
the fuel pump,
fuel pump filter
screen, and fuel
are sufficient
Check or clean
the injector
Check engine
exhaust pipe,
carbon canister, fuel
tank vent pipe and
other hoses
High idling speed of hot car
When a cold car occurs, it can run at a normal fast idling speed. After a hot car, the idling speed does not fall back to 1500-
1700 rpm. You can refer to the following diagnosis process to troubleshoot the cause of the fault.
Warm up idling
speed is too high
Check whether the
throttle body is not
tightly closed
Y
Check the free stroke of
the throttle cable; remove
the throttle valve body
assembly for cleaning
Y
Check for leaks at
the intake
manifold
Y
Replace
Y
Check the water
and oil shared
sensor
Y
Replace
N
Check whether the
exhaust pipe of
the engine is
leaking
Y
Replace
N
Check whether the
idle speed control
valve is normal
N
Replace
Y
Check the wires
N
N
Unsteady idle speed of cooling car
Cold car idling is
unstable and easy
to stall
Check the idle
speed control
valve
N
Overhaul or
replace
Y
Check the water
and oil shared
sensor
N
Replace
Y
Check the injector
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