Mazda MX-5 Miata Sport 2007 Manual page 1966

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
14 Visually inspect CKP
sensor and teeth of
crankshaft pulley.
Are CKP sensor and
teeth of crankshaft
pulley normal?
15 Inspect the ignition coil
related wiring harness
condition (intermittent
open or short circuit)
for all cylinders. Are
wiring harness
conditions normal?
16 Perform the spark test.
(See SPARK TEST .)
Is strong blue spark
visible at each cylinder?
17 Inspect the spark plug
condition.
Is spark plug wet,
covered with carbon or
grayish white?
18 Remove and shake the
PCV valve.
Does the PCV valve
rattle?
19 Visually inspect the
exhaust system part.
Is there any deformed
exhaust system part?
20 Install the fuel pressure
gauge between the fuel
pipe and the fuel
distributor.
2007 Mazda MX-5 Miata Sport
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
If CKP sensor and wiring
harness are normal, go to the
next step.
Go to the next step.
Replace the malfunctioning part.
Go to the next step.
Repair the wiring harnesses.
Go to the next step.
If symptoms occurs with the
A/C on, go to Step 24.
Repair or replace the
malfunctioning part according to
spark test result.
Spark plug is wet or covered
with carbon:
Inspect for fuel leakage from
injector.
Spark plug is grayish white:
Inspect the fuel injector for
clogging.
Install spark plugs on original
cylinders.
Go to the next step.
Go to the next step.
Replace the PCV valve.
Replace the suspected part.
Go to the next step.
Go to the next step.
Zero or low:
Inspect the fuel pump relay and
fuel pump circuit.