Rough, Unstable or Incorrect Idle; Stalling

***UPDATED BY TSB #405489 DATED FEB. 20, 1989

Mazda recommends the use of UNLEADED REGULAR gasoline only, in all vehicles not equipped with a turbocharger, unless otherwise specified. Do not use, or recommend for use, any higher octane fuels. Starting, idle, and driveability problems may result. See factory Technical Service Bulletin #405489, titled "USE OF REGULAR UNLEADED GASOLINE".

Definition: The engine runs unevenly at idle. If bad enough, the vehicle may shake. Also, the idle may vary in rpm. Either condition may be severe enough to cause stalling. Engine idles at incorrect speed.

POSSIBLE CAUSE ACTION

Throttle linkage sticking/binding Check and adjust
Refer to THROTTLE CHAMBER and THROTTLE CABLE

Fuel Injected Check air/fuel ratio,
Refer to COMPUTERIZED ENGINE CONTROLS
Check fuel pressure,
(check vacuum line and return hose)

Incorrect idle speed Check and adjust
Refer to ADJUSTMENT PROCEDURES