So I have a 03' Chevy Trailblazer LT and for the last 3-4 months the car would die if the lights were left on for a short while, (And I dont' mean the head lights all night)

Like if we left the interior lights on for about a half'n hour then it would be dead.

So I figured it was the battery, well I just replaced the battery 2 days ago, and right away pulling out of the auto store where I replaced the battery, the car died, and I was like...wtf?
So I checked the terminal connections and tightened them, and it started right up again.. And I've been driving it since, and it seems to run fine, EXCEPT when I stop, at a stop light, in the driveway, pulling up to a "T" intersection.. it acts like it wants to die, idling around 1k rpms and then dropping down to 300rpms...then back up again to 1k... then back down to 300...


So what do you guys think it is? bad battery from the parts store (napa) bad alternator?

thanks!

 

So after a little bit of research with a ohm meter.

When the car is off the batter is up at around 12.5V
When the car is running its up at around 14.5V

So it looks like my battery and alternator are fine.

But I'm still having this weird idling issue where the car wants to die, and sometimes dies. After a little bit of research online it looks like if you unplug the batter the car can "unlearn" stuff... So do I need to do something for it to "relearn"? or do I have to drive it for a while?

Any help would be great. Thanks!

 

https://chevroletforum.com/forum/tra...roblems-36639/

Seems like other people seem to have this same idling problem, but mine only started happening after I replaced the battery. any ideas?

 

Could just be coincedence. Try the negative cable off for 1/2 hour.

 

What does that do?
Does the computer reset after a 1/2 hour?
Thanks!

 

Supposed to, it is something to try I'd not think it has anything to do with the battery.

 

Mine did the same thing when I had it. It would relearn after driving for a short while and be OK again. Sometimes it took 2 days. Fortunately it wasn't as bad as yours sounds.

 

Ok, this is kinda what I've gathered from a few different forums, but no one said whether it would "relearn" on its own, or whether I had to do something.

...I'll give it a couple of days and then see where we are at.
Thank you!