Mazda MX-5 Miata Sport 2007 Manual page 2011

2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
POSSIBLE CAUSE
Improper ATF level (AT)

Weak spark

Poor fuel quality

Erratic or no signal from CMP sensor

Clutch slippage (MT)

Improper variable valve timing control system

operation
Improper coolant level

Inadequate fuel pressure

Spark plug malfunction

PCV valve malfunction

Brake dragging

Improper valve timing due to jumping out of

timing belt
Contaminated MAF sensor

Improper engine compression

Exhaust system clogging

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] .)