DY Demio stumbling idle

[Dust]

My EGR got replaced last year, but the idle has slowly gotten worse again. I try to run it up to 7K once a week, but don't know if I need to be beating on it more, or if I need to Seafoam it. What should I be looking at?

 

[Racebrewer]

O2 sensor might be getting old.

Sparkplugs or wires. How many miles?

John

 

[Dust]

91K Kms and they were changed as far as I know 4 years ago. But, to be honest, I don't honestly know where to buy spark plug wires for the car.

 

[Dust]

Anyone tried Seafoam? Wondering what hose I need to be using, as I can't find anything as the top is all air filter

 

[PGTBrow]

I normally just put Seafoam in the gas so I don't go all diesel in my neighborhood. Haven't tried it in anything this new yet though...

 

[DrWebster]

Isn't the DY the 2nd gen Demio? IIRC anything 2008+ is DE, aka 3rd gen.

But I agree, just do the Seafoam in the gas, at least to start. Also try removing and cleaning your throttle body, this has apparently helped a lot of Mazda 3 owners with weird idle issues.