Mazda MX-5 Miata Sport 2007 Manual page 1995

2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
POSSIBLE CAUSE
operation
Erratic signal to ignition coil

Air cleaner restriction

PCV valve malfunction

Fuel flow into evaporative purge hose

Improper valve timing due to jumping out

timing belt
Restriction in exhaust system

Intermittent open or short circuit in fuel body

pump circuit
Inadequate fuel pressure

Fuel pump mechanical malfunction

Check valve (two-way) malfunction integrated

with fuel tank
Fuel leakage from fuel injector

Fuel injector clogging

Fuel line restriction or clogging

Pressure regulator malfunction (built-in fuel

pump unit)
Erratic signal form Accelerator pedal position

sensor
Erratic signal form TP sensor

Intermittent open or short circuit of MAF

sensor, TP sensor, Accelerator pedal position
sensor and VSS
AT malfunction (AT)

Clutch slippage (MT)

Improper variable intake air control operation

Loose attaching bolts or worn engine mounts

WARNING:
The following DIAGNOSTIC PROCEDURE TABLE
contains the fuel system diagnosis and repair
procedures. Read the following warnings before
servicing the 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