4
Perform the spark test.
(See
SPARK TEST
.)
Is strong blue spark
visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part according to
spark test result.
5
Install the fuel pressure
gauge between the fuel
pipe and the fuel
distributor.
Start the engine and idle
it.
Measure fuel line
pressure during idle.
Is fuel line pressure
correct during idle?
(See
FUEL LINE
PRESSURE
INSPECTION [LF]
.)
Yes
Go to the next step.
No
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:
Replace the fuel pump unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION
[LF]
.)
6
Inspect for variable
valve timing control
system operation.
(See
VARIABLE
VALVE TIMING
CONTROL SYSTEM
OPERATION
INSPECTION
.)
Does the variable valve
timing control system
function properly?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part.
7
Inspect for the variable
intake air control
operation.
(See
VARIABLE
INTAKE AIR
CONTROL
OPERATION
INSPECTION
.)
Does variable intake air
control function
properly?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part.
8
Remove and shake the
PCV valve.
Does the PCV valve
rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 80
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