
crankshaft pulley.
Are the CKP sensor and
teeth of crankshaft
pulley normal?
No
Replace the malfunctioning part.
6
Inspect the spark plug
condition.
Is spark plug wet,
covered with carbon or
grayish white?
Yes
Spark plug is wet or covered
with carbon:
Inspect the fuel injector for fuel
leakage.
Inspect spark plug and high-
tension lead.
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 PCV valve.
8
Perform electronic
throttle control system
operation inspection.
(See
ELECTRONIC
THROTTLE
CONTROL SYSTEM
INSPECTION
.)
Does electronic throttle
control system function
properly?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part according to
electronic throttle control
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 the fuel pressure
gauge between the fuel
pipe and the 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]
.)
High:
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 72
© 2005 Mitchell Repair Information Company, LLC.