Once started the car ran really rough with the rpms ranging from 0-1000 and struggling to stay running. I've never experienced this problem before on both my 2.3 liter (2007 and 2008) Mazda 3's. I have a 2005 Outback 2.5i. They said the computer might lose some data after battery was disconnected. It might take a day or two of driving in traffic before the engine will settle down again. I asked for help on this site, got a few helpful tips but idk what to do further. The car seemed to run a lot more smoothly and maybe even more quietly. Disconnect the negative battery cable and connect the probe ends of a digital multimeter -- set to read volts DC -- to the negative and positive battery terminals. The car was running just fine yesterday and even running fine smoothly when I got it turned on in the morning. what this will do is it will reset the cars computer to it's default settings. Regards, John Fishbeck Haslett MI It is unlikely. I had no issues with it before I disconnected the battery, so I doubt it is the alternator. I've seen it more than once when a vehicle has the battery disconnected for a long repair that it has running issues later. ... Also to reset the adaptations you can try and to reset it by disconnecting both battery terminals and touching both cables together for about 5 minutes. The ECU now has default numbers in its trim memory - it has to adjust them to match the tune of your engine and its sensors and actuators. The reason I cleaned the throttle body was mostly because of that horrible low idle when I replaced the battery earlier this year. Sometimes it the engine will cut out right away and sometimes it will run for a while, but still very rough. But glad it worked for others. My battery has been showing signs of becoming weak so I replaced it today and after installing it I proceeded to start my car which took much longer to crank than usual but after a few seconds it started. Your truck's Adaptive Memory is a "learned value" that your Powertrain Control Monitor (PCM) has memorized from your driving habits and engine's idle pattern. Worst case is the battery is so flat you need to replace it, Factory Honda batterys are not great when run down. Also flat spots are a concern even on newer cars, but they should work there way out in a few miles. I have a Mazda 3 2.0i w/ 85,000 miles. Remember that the car runs when it is disconnected. You then have to rebuild the program by satisfying a variety of driving conditions like a 0 - 60mph acceleration, cursing at 60mph for X amount of time, and so on. 12,610 Posts #2 • Nov 24, 2011. I drive a 1999 Sable. Hi! Soon thereafter, it will seem to fix itself. If it runs generally good with no CEL then run it a bit longer to see if it improves. They scanned the on-board computer and probably reset the idle air control (IAC) valve or PCM. Thanks The alternator should output from 13.5 to 15.5 volts with the engine running at ... need to "re learn " how to idle after having the battery disconnected. Love it when a plan comes together. Usually happens after driving around and letting it idle here and there. Tested the charging system, working fine. 4. I just had this same problem replace the battery and the car does not idle, and will only stay running if the gas pedal is held down a little bit. The series 5 model has an electronics issue that keeps discharging the battery. 2) Run a jumper wire from the positive battery cable to the now disconnected negative battery cable terminal. The battery does act like a big capacitor in a way, so it's not recommended to run with it disconnected for long. I’ve read where changing the battery may affect a car’s idle and have since disconnected the battery terminals (both) and reconnected them after 30 minutes. If it is running rough, something is not right with the plug install. I also noticed that it was only drawing -10psi of vacuum at idle when it … I reset the ECU, and now the car runs rough! Disconnecting Negative Battery Cable When Car Is Running ... to test the voltage of the battery while the car is running, and test the amps when the car is shut ... still got the car running rough at idle and despite artscots best efforts in previous posts and my vain attempts at diagnostics i still havnt resolved it. Your problem was probably not the battery nor the alternator. Don't worry takes about 70 miles if I remember correctly 11 Tundra CM 4x4 TRD Offroad, Spruce Mica, Zone 3/1, 20x9 XD Black Hoss, 35x12.5x20 Nitto Trail Grappler, TRD Skidplate, Sunroof, Cold Weather Package, Clarion NX501 NAV/DVD, 2 DC Audio 10's, custom ported box, CT Sounds 1400.1D, XenonVision HID's, Plasmaglow Fire and Ice Light Bar, Rhino … Sometimes when the battery is run low or disconnected the throttle body and ECM ... nothing to worry about on that one. to do so, I had to disconnect the battery to see what I was doing and fit my hand. Except this time the idle was perfectly normal no really low idle. Start car A, put battery in car B, start car B. What you need to do is remove the battery cables again, leave it for about an hour or so, and hook them back up. I'm sure it's the battery. We replace them on our lot ALL OF THE TIME when brand new cars are not started for awhile and the battery gets 100% depleated. 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