1997 Mazda 626 Idle is too High

EVE1969

MEMBER
1997 MAZDA 626
4 CYL
2WD
AUTOMATIC
139,000 MILES

I just bought a used Mazda 1997 626 and have been having problems from the first day. The engine light came on and I took it and they did a diagnostic. They said it needed the egr valve and the solenoid valve. They were replaced but its still has problems. Right now the Idle is too high and the said it needs the idle air control motor. I dont want to buy it new is there a way to clean the one it has right now. Can you tell me were is the idle air control motor locted?

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

The IACV is located on item no. 3

Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed.