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Disconnecting the battery (for longer than a few moments) causes the onboard Engine Control Computer to reset and forget all the calibration data for your car. (In much the same way that you might have to re-program your favorite radio station push-buttons again.) When you re-connect the battery and re-start the car, it has to "re-learn" all the correct settings for your particular car's engine all over again and the only way that happens is by actually using the car. Taking the car to the dealer as someone else suggested won't do any good, unless you like paying $65+ per hour for the mechanic to drive your car around and get it all warmed up. :-) After about the first 10 miles, the idle will be much better. It will take 30-50 miles for the entire re-calibraton to finish. If, after several days of driving your cars idle and/or performance does not improve - or you get a "Check Engine" light - you should seriously consider getting the car serviced by someone who really knows Toyotas. (Not necessarily the dealer - though some are good - you want someone who knows what they're doing.) If you're REALLY curious - invest in an OBD-II diagnostic hand-held.
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2002 Camry 4 cylinder-why ruff idle-500 RPM- after new battery installed?
the ecu is reset when you disconnect the battery. after driving for awhile or letting the car idle in drive, your problem should be solved. the ecu is reset when you disconnect the battery. after driving for awhile or letting the car idle in drive, your problem should be solved.
How do you reset idle on 2004 F150 after battery been replaced?
Need to erase keep alive memory then idle for at least 15 minutes
Why is it my battery will barely turn the motor over and when it does start you have to pump the gas pedal to keep it running?
The battery is weak and needs replaced. when the battery is weak the computer can forget how to idle.
Replace spark plug 2001 Mazda tribute?
2002 Mazda tribute, what is cylinder misfire My #5 cylinder has a misfire. Battery light also flickers according to idle. So far not alternator. Alternator and battery was replaced maybe 2 years ago.
Why do light goes dim and engine idle down after a new battery have been replaced?
There is a bad ground cable.
How do you adjust idle speed for a 2002 Toyota Camry?
it is not adjustable it is a drive by wire systemMotor Abbreviation Definitions Idle Speeds (Fuel Injected)Trans.Min. Check Speed RPMMax. Check Speed RPMFootnoteAT610710265MT650750265Note 265: Idle speed is not adjustable.
1999 Dodge Ram 1500- Idle is erratic.Replaced the Idle CONTROL Motor a couple of years ago. Vehicle has about 82000 miles. ANY ANSWERS on why it would have to be replaced again?
A weak battery or a bad throttle position sensor can also cause erratic idle. If it turns over slow, the battery needs replaced. If you tap the tps and the rpm's change , the tps is bad.
Changed battery on Toyota Camry 2002 xle and now it wont stay idle?
If you have just changed the battery and you haven't driven car much you need to wait a little while the ECU leans all parameters. In case you drove your car for a while and it's still doing that, erase all codes from the ECU memory.
Replaced battery and alternator on 97 mercury sable and it keeps stalling what is the problem?
Idle air control? Fuel pump? Coil?
Why does the idle on my 2009 Toyota Camry reduce when the fan is on?
The current needed to operate the cooling fan(s) puts a load on the alternator which causes the idle rpm to drop a little. Have the battery and charging system tested to be sure there isn't a problem.
Your 1993 ford escort will not idle after the motor is warm and have replaced the idle air valve?
Perhaps a vacuum leak, or clogged throttle body. Perhaps just a worn out engine. When you replaced your idle air control valve, did you remove the battery for at least 10 minutes? It will reset the computer, then start the car up with all the accessories on, let it idle for about 5 minutes. It should relearn how to idle. Perhaps that will help.
Why wont my 2002 Toyota solara idle but runs fine?
Try to clean your throttle body. If you disconnect your battery or get a bad connection your throttle body will act up if it is dirty and it will not idle.
