The idle air control (IAC) valve on a Mazda 626 is typically located on the throttle body, which is situated near the intake manifold. It is responsible for regulating the engine's idle speed by controlling the amount of air that bypasses the throttle plate. For specific models and years, it's advisable to consult the vehicle's service manual for precise location and details.
Standing on the drivers side of the engine compartment, it is on the right side of the throttle body.
Trouble code P1506 means: Idle Air Control System RPM Higher Than Expected
check the Idle Air Control (IAC) may need to be cleaned. Refer to the following website. http://www.geocities.com/adamk01452/IAC_Clean.html
http://www.geocities.com/adamk01452/IAC_Clean.html this will refer to cleaning you IAC (Idle Air Control) valve.
It does not have one.
throttle postioning sensor is bad
During the first session
It's almost always a vacuum leak.
A Mazda 626 may idle sporadically due to several reasons, including a dirty or failing idle air control valve (IAC), vacuum leaks, or issues with the fuel system such as a clogged fuel filter or failing fuel pump. Additionally, problems with the ignition system, such as worn spark plugs or ignition coils, can also lead to irregular idling. Regular maintenance and diagnostic checks are recommended to identify and resolve the underlying issue.
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i believe it is for traction control