low idle

[xxfmulder]

I have a 2004 Mazda3, with the 2.3L engine. The check engine light came on a few weeks ago. I had it scanned at Autozone, and the code said there was a slight intake leak. I had it reset, and it never came back on.

The idle seems to be a bit low (500-550RPM). The car rattles a little bit at idle. Is this low? Where is a common spot to check for an intake leak?

TIA

 

[naddie]

Wouldn't the idle be high if there is an air leak in the intake? Does the MS3 have an idle re-learn? That could fix it. I'd go to the stealership and ask their techs to see if there is a idle relearn process you can do on your own. Or ask the ppl here. They're really helpful...

 

[blynzoo]

The idle re-learn, as you put it, is the same for all Mazdas.
Disconnect both terminals from the battery.
Depress the brake pedals(this completes a circuit to the brake lights).
Reconnect the terminals. Start.
Every time the ECU loses power (when you radio stations reset ), it treats itself as if it's coming off the back of the truck, learning its environment.
This is also helpful if you move to a different altitude.

 

[fourthmeal]

Do you have the specific code?

Also, double-triple check the oil level. These engines have a history of going low on oil and doing very bad things.