Bespoke76 Posted May 19, 2005 Share Posted May 19, 2005 Hi there, I changed the battery on our Subaru Legacy L (2000) last week and now the car can't hold a constant rpm at traffic lights etc. The needle slowly falls to about 100 rpm before bouncing back up to around 900 rpm. My mechanic says its probably just the throttle body that needs cleaning...does that sound right? Cheers Bespoke76 Quote Link to comment Share on other sites More sharing options...
mtsmiths Posted May 19, 2005 Share Posted May 19, 2005 Could be lots of things, but prolly just a coincidence and not related to the charge ... unless, you didn't hook the charger up backwards along the line did you? Quote Link to comment Share on other sites More sharing options...
All_talk Posted May 19, 2005 Share Posted May 19, 2005 If the battery was diconnected long enough it might have reset the ECU and its having ti re-learn the idle setup... just a thought. Gary Quote Link to comment Share on other sites More sharing options...
Sweet82 Posted May 19, 2005 Share Posted May 19, 2005 Charge the battery again and see it the problem goes away My money's on two different problems. If your talking about your original battery, it's now 5 years old and probably getting to the point of needing replacement anyway. Two things, I'd try First a couple of bottles of carb/injector cleaner through the fuel system over the next few weeks. Second check your antifreeze level? My trooper will idle funny, (high & low) at the intersections when the antifreeze level get low. Good luck, Glenn 82 SubaruHummer 01 Forester Quote Link to comment Share on other sites More sharing options...
Cougar Posted May 19, 2005 Share Posted May 19, 2005 I agree with All Talk about the ECU. The owners manual talks about the learning procedure I think. Quote Link to comment Share on other sites More sharing options...
forester2002s Posted May 19, 2005 Share Posted May 19, 2005 Before resetting the ECU (which involves disconnecting power), just try starting the engine and letting it idle for about a minute. Then drive off. This might do the trick. Quote Link to comment Share on other sites More sharing options...
stevetone Posted May 19, 2005 Share Posted May 19, 2005 Hi there, I changed the battery on our Subaru Legacy L (2000) last week and now the car can't hold a constant rpm at traffic lights etc. The needle slowly falls to about 100 rpm before bouncing back up to around 900 rpm. My mechanic says its probably just the throttle body that needs cleaning...does that sound right? Cheers Bespoke76 Did you disturb any vacuum lines in the process of replacing the battery? Quote Link to comment Share on other sites More sharing options...
mwatt Posted May 19, 2005 Share Posted May 19, 2005 Before resetting the ECU (which involves disconnecting power), just try starting the engine and letting it idle for about a minute. Then drive off. This might do the trick. Disconnect the battery for approx 1 minute. Reconnect it. Make sure ALL accessories are off (lights, A/C, stereo, etc). Start the engine and DON'T TOUCH ANYTHING---DON'T TURN STEERING WHEEL--KEEP FOOT OFF OF BRAKE PEDAL--JUST LET IT IDLE FOR APPROX 60 SECONDS IN "P" (nuetral with stick shift) to re-learn the correct idle speed. Quote Link to comment Share on other sites More sharing options...
mtsmiths Posted May 19, 2005 Share Posted May 19, 2005 I think the general consesus for a battery dance is a minimum of fifteen minutes (to an hour). BTW, open a window and leave the key in the ignition, that way you won't even turn on the dome light when you start it. When you start driving, drive the way you want the car to perform, it will 'learn' your style, aggro, benign, wimpy, and respond that way henceforth. Quote Link to comment Share on other sites More sharing options...
kidwired Posted May 20, 2005 Share Posted May 20, 2005 Check your battery terminals and cables, clean and tight connections, inspect wireing and especially grnd terminations. Quote Link to comment Share on other sites More sharing options...
Jack in Norfolk Posted May 20, 2005 Share Posted May 20, 2005 This is almost certainly the result of faulty wiper blades! Quote Link to comment Share on other sites More sharing options...
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