Question about 2000 Mazda B-Series

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The rpm fluctuates at idle

Hi, I have a Mazda car bj5p model, (like 323, 2001), The rpm fluctuates at idle and when I take my foot off the accelerator paddle. Sometimes the rpm goes down to about 200 and the engine almost stops and there is big vibration in the silencer area when this occur. At this time, even if I press the accelerator paddle, the engine does not raise. It comes back to normal after some time. Is this a sensor problem or something else?

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  • nilanper Oct 04, 2009

    Hello lylerwh,

    Thanks much for your reply, what is an IAC?
    here's some more info on the problem: No engine lights are coming on. The problem starts to occur after I have driven for about 20 - 30 minutes. The last time this occurred, the rpm did not come up until a while and had to push the accelerator paddle to the max and the vehicle moved forward very slowly. Afterwards I got a rubber-burning smell coming from the bonnet.

  • nilanper Oct 04, 2009

    Thanks freetek for your reply.

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It could be several things...low fuel pressure, a lazy 0 2 sensor, and even an IAC. If there isn't any service engine lights coming on, you will need a qualified tech to do the test since a lazy 0 2 sensor has to be looked at with some type of a volts meter and a scanner has the capability of doing a better job yet since you wouldn't have to get underneath the vehicle. Don't be fooled into thinking that it is just one thing; it could be several depending on the mileage.

Posted on Oct 03, 2009

  • Lyle D. Rowh Oct 21, 2009

    An IAC is an Idle Air control...it is connected to the throttle body, but it looks like you are a candidate for a tech to look at this problem since at this point you can have more in it by parts chasing than the actual repair.

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  • Mazda Master
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It sounds like a failed 'idle air control.' Your computer may be monitoring engine conditions so having it scanned at one of the chain auto parts stores may identify the problem. The scanning is (in my experience) free of charge but call first to confirm this.

Posted on Oct 03, 2009

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