Rough idle after charging battery - Team Camaro Tech
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post #1 of 10 (permalink) Old Jul 13th, 13, 09:17 PM Thread Starter
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Tim
 
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Rough idle after charging battery

Middle of winter here in the southern hemisphere, and had some pretty sharp frosts lately - so checked the battery in the wife's DD yesterday. It was around 11.9V, so I disconnected the battery and charged it up fully overnight. Today I reconnected the battery and started car; idled really roughly, and at very low revs, especially when i put it in gear. It actually died as I backed the car out of the driveway. On restarting, back to normal idle, and behaved as usual on a test drive.
What could have caused this problem?
FWIW, car is an '04 Holden (GM) Commodore with 5.7 LS1 and 4L60E trans.
Thanks for any ideas/suggestions

1969 04A Van Nuys-built Z/28. Cortez Silver with dark blue interior and VE3. Sold Clippinger Chevrolet. Raced at Lions in LA.
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post #2 of 10 (permalink) Old Jul 13th, 13, 11:25 PM
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Re: Rough idle after charging battery

My guess is when you disconnected the battery the computer reset. It has to run for a while to relearn it's parameters.
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post #3 of 10 (permalink) Old Jul 13th, 13, 11:58 PM Thread Starter
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Tim
 
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Re: Rough idle after charging battery

Quote:
Originally Posted by grampstoyz View Post
My guess is when you disconnected the battery the computer reset. It has to run for a while to relearn it's parameters.
Interesting; I've replaced the battery every 4 years since new, and it has never done that before, but maybe a quick changeover doesn't affect it, and being disconnected for 12+ hours does.
Thanks for the suggestion!

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post #4 of 10 (permalink) Old Jul 14th, 13, 03:20 AM
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Steiner
 
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Re: Rough idle after charging battery

Tim, my '02 Z/28 with LS1/4L60E did the exact same thing a few months ago when I replaced the alternator and battery and it was only down for a couple hours. Seems like I remember the voltage gauge swinging wildly like the PCM was oscillating the charge command to the alternator and I could hear the fuel pump going up and down also. I don't think it's the PCM resetting because imaging if they all did that at the factory the first time they fired up or lost power...that would be one poor base calibration. Just like you, power cycled it and it was right back to normal and I've had it down and even the PCM battery fuse removed before without it doing that.

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post #5 of 10 (permalink) Old Jul 14th, 13, 03:46 AM
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Re: Rough idle after charging battery

Looked around on LS1tech and apparently it's a fairly common thing. For some reason once in a while they just flat out forget how to idle when power is lost. Weird that it's not every time, and that shutting it off and starting it back up cures it. There's also an idle relearn procedure but that is done with the car hot.

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TKO 600-Moser 3.42-Detroit Truetrac
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post #6 of 10 (permalink) Old Jul 14th, 13, 05:53 AM
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Re: Rough idle after charging battery

A good example why I use a jump box. Keeps memory of all items in tact.
A nice tool to have in the toolbox.

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post #7 of 10 (permalink) Old Jul 14th, 13, 02:15 PM Thread Starter
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Re: Rough idle after charging battery

Steiner, thanks very much for the extra info!
Everett, is a jump box the battery-powered unit that plugs into the cigarette lighter outlet and keeps radio and other settings while he main batt is disconnected?

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post #8 of 10 (permalink) Old Jul 14th, 13, 03:04 PM
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Re: Rough idle after charging battery

It can be. I'm thinking of the one with battery post clamps on it.
Like this one:
http://www.harborfreight.com/12-volt...ply-38391.html
Oh wait, you probably don't have HF in Australia

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post #9 of 10 (permalink) Old Jul 14th, 13, 04:03 PM
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Re: Rough idle after charging battery

we have a 5.3l Vortec in a 2001 GMC Seirra pickup and she would idle very rough on cold mornings only, and then smooth out as operating temp increased. A new set of intake manifold gaskets cured that. Start to finish, on our driveway, about 6 hours. Runs like a champ now and its been several months.

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post #10 of 10 (permalink) Old Jul 14th, 13, 10:41 PM Thread Starter
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Tim
 
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Re: Rough idle after charging battery

Quote:
Originally Posted by Everett#2390 View Post
It can be. I'm thinking of the one with battery post clamps on it.
Like this one:
http://www.harborfreight.com/12-volt...ply-38391.html
Oh wait, you probably don't have HF in Australia
Correct, no HF in Australia, but those things are common here. They're OK for starting if you have a flat or weak battery, but our issue was the wife only drives a couple of miles to and from work each day, so the battery never gets a chance for a decent charge. Winter weather further reduced the battery condition, so I had no choice but to hook up the charger overnight. I will never charge a battery in the car without first disconnecting the -ve and +ve cables; made that mistake once (with an Audi, ouch......).

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