My Mazda 3 TS(04 plate) has rough idling due to a CO2 emissions( a mechanic says this ) but he can't find the problem.
So far I've had the throttle body cleaned, changed the plugs, fitted new pcv valve,new breathers, changed inlet manifold gaskets.
I like the car but I'm running out of ideas to solve the rough idling.

Has anyone come across this problem before ?


thanks Steve.

 

Welcome to the forums!!! If you could fill out your signature with your vehicles details (use mine for example) it would help us all out alot! Most of the users on this site are US based so using the standard UK practice of telling plate numbers will not give them the info they need, please use the year your car was manufactured (not registered).

Are you throwing any codes?

 

I think the mechanic got it the wrong way around. The high CO2 is the result of the rough idling. It is likely caused by a vacuum leak. Check every hose that connects to the intake, include the intake air hose itself.
You tube shows a few ways how to detect a vacuum leak.

 

Tanprotege is making me work today, LOL!

YOU TUBE VIDEOS:

 

[QUOTE=UseYourNoggin;133076]Tanprotege is making me work today, LOL!

Tough job! But somebody' got to do it!

 

Thanks everyone,
Tanprotege, the mechanic says the car has negative emissions problem causing rough idling can this be a vacuum leak problem also ?

Steve.

 

Steve: I am not a schooled mechanic myself unless you call the shade tree a school. I don't know what "negative emissions" means.
But it's basic chemistry: High CO2 output requires an abundance of O2 to combine with the C provided by the gasoline. So either you don't get enough fuel or too much air. A vacuum leak causes too much air i.e, more air than the MAF sensor realizes.

So, clean the MAF sensor with MAF sensor cleaner and clean the intake air temperature sensor as well. Then look for vacuum leaks.

Next step: measure fuel pressure. Next step: look into O2 sensors and the catalytic converter.

 

That mechanic is negative, negative in helping you!

 

Thanks Tanprotege,
I'll check things out.

Thanks UseyourNoggin,
You made me laugh!

 

I think I found out what "negative emissions" means. It's like a reverse fart.