hi guys first of all i love my mazda 3 sedan 2004 but i have a lil problem i bought the car 3 months ago and no problem what so ever until i install my amp and sub ive been doin installation on older car and never had any trouble until this one after i install my amp and sub my car would runs really low rpm and stall so i unplug everything and the car would run low but no stall and got better as my car re-learn its habbit and stuff now i dont know what to do and why it would do that i tested the alternator and battery and its fine now that everything is unplug the car runs fine.... did anybody had that problem before and what to do to fix it could my ecu no good or what ??? im really lost here and need help

 

Do you have any repair records for the car? could be a recurring problem.

I put a small system in mine and had no issues. I'd double check if you pulled any wires or hoses when running wire or connecting to the battery. Like the MAF sensor for example - that's right near the battery along with hoses and other stuff that would cause a low idle / stall problem.

See if it's really just when you connect the fuse for your sub, like connect and disconnect with the car running. If it's due to your system as you think that should make the low idle come and go.

 

hey thank man for your reply its nice to see that people actually write back on those thing ... i actually fix the problem couple day ago its was soo stupid even a lil embarrasse of saying what was the problem coming from a mechanical background myself it was only the main wire for the car had a lil bit of paint on it so when i put my audio connection on top of the main wire the connection was poor and there wasnt enough power to make the alternator run properly so i took the paint off reconnect everything and problem fix haha i cant beleive i overlooked that when i first plug it lol

 

It's an easy mistake - everyone has to run into it once... the good thing is that it was an easy fix.