Mazda Forum - Mazda Enthusiast Forums - 03 Mazda Speed Protege

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AndrewB1

03-19-2012 12:31 PM

03 Mazda Speed Protege

Got a little bit of a problem. Seems to me when the car warms up it runs worse. While building boost or 3000rpms in spits and jumps. Any ideas
?
plus i already changed out coils plugs and wires. cleaned fuel system. running outta ideas and wondering what it could be. any suggestioned would be greatly appreciatied

Spiced MSP

03-29-2012 04:15 PM

the car needs a tune. the stock tune on the ECU is pig rich so when you are boosting, the car is dumping excess fuel. That makes the car bog down. The jumping you are experiencing is hesitation. Look into buying a split second air/fuel controller from protegegarage.com. You will be glad you did. I have it and so do lots of others on other mazdas forums Im on.

virgin1

04-01-2012 09:56 AM

Good info and advice.
I know the newer MS3 has a similar problem with the over-rich condition, especially while on-boost. That's just Mazda trying to make sure the car is conservatively reliable. But as with most things... too much of a good thing.

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