INSPECTION [LF]
.)
23
Disconnect the vacuum
hose between the purge
solenoid valve and the
intake manifold from
purge solenoid valve
side.
Plug opening end of
vacuum hose.
Start the engine.
Is starting condition
improved?
Yes
Inspect if the purge solenoid
valve is stuck open
mechanically.
Inspect the evaporative emission
control system.
No
Go to the next step.
24
Is air leakage felt or
heard at intake-air
system components
while racing engine to
higher speed?
Yes
Repair or replace the
malfunctioning part.
No
Go to the next step.
25
Inspect the engine
condition while tapping
EGR valve housing.
Is engine condition
improved?
Yes
Replace the EGR valve.
No
Go to the next step.
26
Inspect the variable
valve timing control
system operation.
(See
VARIABLE
VALVE TIMING
CONTROL SYSTEM
OPERATION
INSPECTION
.)
Does variable valve
timing control function
properly?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part.
27
Is the engine
compression correct?
Yes
Inspect the valve timing.
No
Inspect for causes.
28
Verify test results.
If normal, return to diagnostic index to service any additional
symptoms.
(See
ENGINE SYMPTOM TROUBLESHOOTING [LF]
.)
If malfunction remains, inspect related Service Bulletins and/or On-
line Repair Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:09 PM
Page 45
© 2005 Mitchell Repair Information Company, LLC.
