Assuming that you have a healthy car with no other problems the below procedure should work for you. I've never experienced this problem before on both my 2.3 liter (2007 and 2008) Mazda 3's. 2) Run a jumper wire from the positive battery cable to the now disconnected negative battery cable terminal. Today, I replaced the drivers side headlight on my 2002 es300. what this will do is it will reset the cars computer to it's default settings. Why? I believe when you disconnect your battery you also reset your computer for all your fuel and air mapping back to factory. After cleaning the throttle body the Engine was idling weird (Reving high). Strange. They said the computer might lose some data after battery was disconnected. I never had disconnected the battery while the car is running, just disconnected it waited for 10 min, and connected it again to clear anything that may have been causing the idle problem. 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. I did not fully snap in a couple of connectors when installing plugs, so that could be going on. I re-connected the battery and followed Uncle Scotty's procedure, and the car is running like a top. From what i've heard, after replacing the battery, the memory does clear but if drive around for a while, the memory would come back and all is good, but if that is the case, the dealer forgot to mention that to me and instead stuck me with a bill that i really didn't have to pay for. At that time the battery will need to be replaced. It's normal after a battery disconnect. After reinstalling the battery the car would barely idle. Some vehicles have an idle relearn period or even a procedure when the battery is disconnected. Usually happens after driving around and letting it idle here and there. So I did the whole 1 hour disconnect battery to reset the computer. I also noticed that it was only drawing -10psi of vacuum at idle when it … They scanned the on-board computer and probably reset the idle air control (IAC) valve or PCM. If I disconnect the battery in my car for what ever reason I … NOTE. I’ve then let the car idle on it’s own for about another 10. 6) If you miss the symptoms in the first week or so after a battery disconnect then the idle correction still keeps learning - as does the long term trim correction. It might take a day or two of driving in traffic before the engine will settle down again. This article applies to the Ford F-150 (2004-2014) and the F-250, F-350 Super Duty (2005-2014). The car was running just fine yesterday and even running fine smoothly when I got it turned on in the morning. Last night I replaced the original battery and took the car for a good drive to make sure the new one was charged. On the 2008 I'm even running a tune, optimized throttle body, larger throttle body, etc and this has never happened after a battery disconnect. 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. It is unlikely. 4. I've done it before when stuck with a flat battery without any jumper leads. The series 5 model has an electronics issue that keeps discharging the battery. Start car A, put battery in car B, start car B. 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. I reset the ECU, and now the car runs rough! The reason being that people still forget and leave their lights on. I've seen it more than once when a vehicle has the battery disconnected for a long repair that it has running issues later. Battery problems can quickly arise from alternator problems. What you need to do is remove the battery cables again, leave it for about an hour or so, and hook them back up. My car has an automatic transmission. Even if that is not the issue car batteries eventually fail even if properly maintained. I drive a 1999 Sable. This is … Was that psychosomatic or does the battery really affect how an engine runs? 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. Last Saturday, the car wouldn't turnover (partially due to the cold, partially due to it having a 5 year old battery). If it is running rough, something is not right with the plug install. I asked for help on this site, got a few helpful tips but idk what to do further. Put battery back in car A, and battery back in car … Remember that the car runs when it is disconnected. I don't understand why, but it seems to fix itself. 12,610 Posts #2 • Nov 24, 2011. 1) Disconnect the negative battery terminal. ... rough idle is the problem, you need to do the idle learn procedure for your car . Had to drive the car with right foot on gas and left foot on brake for 1.5 miles to a nearby mechanic shop. As long as the car is being run fairly often the battery can be continuously recharged and ready for use. I have a Mazda 3 2.0i w/ 85,000 miles. Sometimes when the battery is run low or disconnected the throttle body and ECM ... nothing to worry about on that one. 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 … As stated when you drive the car the lights on cluster should go away, but it sounds like you have something else going wrong. 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. Ran through a huge puddle with my car and it started running rough, lost its power, the check engine light was blinking and after 2-3 miles it died. When I reconnected the battery and went to start the car, it started as normal for about 1 second, then died. Sometimes it the engine will cut out right away and sometimes it will run for a while, but still very rough. After recently disconnecting the battery and replacing a headlamp fuse and a headlamp, my 2003 Toyota Camry will now run very rough and die soon after starting. The short circuit you’re creating here is designed to drain all power from the capacitors inside the PCM. As a result the car will usually sort out the idle problems after a week of running. Except this time the idle was perfectly normal no really low idle. The simplest way to check for a bad ground is to run a continuity test between the battery and the chassis. RX-8 Stalls After Battery Disconnected This is a brief guide to a possible solution for those that have problems with the car idling after your battery has been disconnected and the ECU reset. Hi! But if the car isn't being run often, the battery will slowly drain over time and soon won't have enough juice to send the necessary voltage to the starter. Love it when a plan comes together. So my thinking is that the missing signal from the MAF is keeping the ECU from using input from the actual failing sensor, ll. Tested the charging system, working fine. But glad it worked for others. How to fix a bad idle or stalling that can occur after you've disconnected the battery. Before dying, there was a smell in the passenger compartment, i dont know if of gas or burning oil. I had no issues with it before I disconnected the battery, so I doubt it is the alternator. Thanks 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. My car has 90000 miles. 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. Do this with the negative cable DISCONNECTED from the battery. 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. Regards, John Fishbeck Haslett MI I've had my battery out a couple times and every time I replace the battery, the car idles rough or stalls. Once started the car ran really rough with the rpms ranging from 0-1000 and struggling to stay running. Battery was disconnected entire time, and the car had been sitting overnight ('stone cold'). Hello Forum, New here, and I'm having a bit of an issue. Also flat spots are a concern even on newer cars, but they should work there way out in a few miles. Q: If you unplug the mass air flow sensor the car will start. 'M having a bit of an issue to plug it in while it 's default settings time and. Battery to reset the ECU, and i 'm having a bit longer to what. Your fuel and air mapping back to Factory vehicle has the battery be. Couple times and every time i replace the battery is so flat need... Flow sensor the car seemed to run a continuity test between the to! 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