I was just wondering if anybody knows the cause of the hesitation at aprox. 2200 rpm. I have searched and found nothing.....I just started having this problem last time I reset my ecu. I have just the tps and made shure there are no fat spots. and I have instaled ground wires, but nothing seames to make it go away. It only happens at aprox. 1/8 to 1/4 throtle on drive away. Any help would be grately apreaciated. By the way I have tried reseting the ecu countles times, and when ever it hesitates at 2200 my air fuel ratio gauge leans all the way out for the legnth of the hesitation

 

replace 02 sensor? Just a suggestion. Use a universal so it's not a big $$ risk.

Dave

 

actualy.. i did that, sorry i forgot to include that ...by the way I changed my spark plugs about the same time it happend, thanks though

 

I had that prob.! Lots of other have (or have) had it too. No one really knows it sounds like, Mazda included. I, however, got rid of mine when I replaced the ECU with the PFC unit. Gone, completely!! No matter how soft or how hard I transition through that RPM range it's gone. This would suggest or support some folks theory about the stock ECU having poor timing on the injector switching. If you plan to do any modding then you'll need a fuel management anyway so consider the PFC with my case in mind.