Rich mixture on stock ECU

Jickywoo

Member
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2003.5 Mazdaspeed Protege
Just curious how much the stock ECU flash actually helps with the rich fuel issue when you smash the gas. Finally have mine running how it should and just took her out for a drive and that hesitation is extremely annoying...
 
It actually doesn't correct the rich issue. It advances the timing to mask the rich issue.
 
I haven't had a before and after ecu, but from what I've heard it is.
 
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