I have a 2003 Mazda Protege es 2.0 automatic that smells like rotton eggs when i drive my car going at a faster speed. I know that the smell is from the engine running rich but how do i stop that? Also when coasting my car feels like it sputters once in a while. Please help me.

 

the smell is from the cat, go run it hard for a min. or 2 and look under to see if the cat is glowing red, if it is its either clogged or your running pig rich

 

If im running rich what can i do to stop my car from running rich?
thanks david

 

any suggestions

 

How is the engine idle? Smooth? Is the CEL on? (what codes?) What recent work was done on car?

 

No Check engine lights. i just bought car about 2 months ago. I noticed the smell like a week after buying car. I cleaned the egr valve, the hole intake manifold was replaced due to a recall on the car. but thats about it. Car does run pretty smooth. car doesnt idle to rough since i cleaned egr valve.

 

if your car is running rich. you can always invest in a air/fuel controller... cause the 03 mazda protege/MSP came rich from factory. dealerships offer a flash for the ECU which pretty much fixes it,, but it can cause more problems.