Mazda MX-5 Miata Sport 2007 Manual page 2015

2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
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] .)