5
Visually inspect the
CKP sensor and teeth of
crankshaft pulley.
Are CKP sensor and
teeth of crankshaft
pulley normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
6
Inspect the spark plug
conditions.
Is spark plug wet,
covered with carbon or
grayish white?
Yes
Spark plug is wet or covered
with carbon:
Inspect for fuel leakage from
fuel injector.
Spark plug is grayish white:
Inspect the fuel injector for
clogging.
No
Install the spark plugs on
original cylinders.
Go to the next step.
7
Remove and shake the
PCV valve.
Does the PCV valve
rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
8
Perform the electronic
throttle control system
operation inspection.
(See
ELECTRONIC
THROTTLE
CONTROL SYSTEM
INSPECTION
.)
Does the electronic
throttle control system
function properly?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part according to
electronic throttle system
operation inspection results.
9
Visually inspect
deformed exhaust
system part.
Is there any deformed
exhaust system part?
Yes
Replace the suspected part.
No
Go to the next step.
10
Install fuel pressure
gauge between the fuel
pipe and fuel
distributor.
Short check connector
terminal F/P to body
GND using a jumper
wiring.
Turn the ignition switch
to the ON position.
Is fuel line pressure
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump relay and
fuel pump circuit.
Inspect the fuel line for
clogging.
If there is no malfunction,
replace the fuel pump unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION
[LF]
.)
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 65
© 2005 Mitchell Repair Information Company, LLC.
