POSSIBLE CAUSE
EGR valve malfunction
Exhaust system clogging
Fuel tank ventilation system malfunction
Fuel-filler cap malfunction
Charcoal canister damage
Air cleaner element clogging or restriction
Throttle body malfunction
Erratic signal to ignition coil
Improper air/fuel mixture ratio control
operation
Bend or open circuit HO2S wiring harness
Catalyst converter malfunction
Engine internal parts malfunction
Excessive carbon is built up in combustion
chamber
Improper engine compression
Improper valve timing
WARNING:
The following DIAGNOSTIC PROCEDURE
TABLE contains fuel system diagnosis and
repair procedures. Read following
warnings before servicing fuel system:
Fuel vapor is hazardous. It can easily
ignite, causing serious injury and
damage. Always keep sparks and
flames away from fuel.
Fuel line spills and leakage are
dangerous. Fuel can ignite and cause
serious injuries or death and
damage. Fuel can also irritate skin
and eyes. To prevent this, always
complete "BEFORE SERVICE
PRECAUTION" and "AFTER SERVICE
PRECAUTION" described in this
article.
(See BEFORE SERVICE
PRECAUTION [LF] .)
(See AFTER SERVICE PRECAUTION
[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 82
© 2005 Mitchell Repair Information Company, LLC.