2000 Mazda MPV Won't Idle Humming

2000 MAZDA MPV
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56KRUSE
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  • 1 POST
I HAVE A 2000 MAZDA MPV THAT WILL NOT IDLE; I ALSO HAVE BEEN HAVING PROBLEMS WITH A LOAD HUMMING NOISE COMING FROM THE AIR FILTER BOX. I TOOK THE AIR BOX OFF, NO JOY, THEN THE PLASTIC PIECE THAT HAS A O2 SENSOR NO JOY, THEN THE 3 TO 4 INCH RUBBER HOSE GOING TO THE INTAKE STILL CAN NOT FIND ANYTHING WRONG. I NOW AM LOOKING AT THE DIAPHRAGM THAT IS HOOKED TO THE CABLE FOR THE, I AM ASSUMING THE CHOKE OR IDLE. IT ALSO HAS AN AIR LINE COMING OFF THE INTAKE TO THE DIAPHRAGM. DO YOU HAVE ANY SUGGESTIONS? AT THIS POINT I WOULD APPRECIATE ANY HELP. THANKS
Feb 27, 2006 at 1:27 PM
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COSMO
  • ✓Experienced Mechanic
  • 347 POSTS
THat sound you are hearing (loud humming) is a faulty IAC valve on the back of the intake, its behind the EGR valve. It will need to be replaced (not cleaned or repaired) in order to clear up the problem. That what I think you are describing.

Cosmo...Mazda TEch
Feb 27, 2006 at 2:48 PM
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Suggested Repair

Replace the IAC valve on the back of the intake, behind the EGR valve. Do not clean or repair it; replacement is required to stop the humming and idle problem.

Conversation Summary

A 2000 Mazda MPV with about 70,000 miles will not idle and has a loud humming noise from the air filter box area. The owner inspected the air box, an oxygen-sensor housing, and an intake hose without finding the cause, and was considering a diaphragm linked to a cable and an air line. A Mazda technician identified the noise as a faulty IAC valve behind the EGR valve and said it must be replaced rather than cleaned or repaired.

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