Battery Replacement, then BAD performance
Thread Starter
Instructor
Joined: Jul 2002
Posts: 211
Likes: 0
From: Cape Coral FL
Battery Replacement, then BAD performance
I recently replaced my battery on my '01 Z06, and since then something is wrong. :confused: At full throttle the engine misses. Sometimes at start-up, it back fires through the exhaust. Someone mentioned "Computer Relearn". Is that correct, how do I get it to relearn properly, and how long should it take?
Thank you.
Steve Nix
Thank you.
Steve Nix
Safety Car
Joined: Jul 2001
Posts: 4,261
Likes: 2
From: Fort Wayne,Indiana
Re: Battery Replacement, then BAD performance (SteveNix)
Hey Steve I just replaced my battery today in my 01 and it still runs like a raped ape....I am sure someone will chime in soon to help...Good luck.
Tech Contributor
Joined: May 2003
Posts: 7,035
Likes: 134
From: North Augusta, SC
Re: Battery Replacement, then BAD performance (SteveNix)
According to the service manual an Idle Lear Procedure IS required if you disconnect the battery or the PCM looses power.
Here's a link to the procedure I used, it's slightly different from the service manual, but it worked fine on my '01.
http://<a href="http://www.c5forum.c...elearn.php</a>
Good luck! :cheers:
Here's a link to the procedure I used, it's slightly different from the service manual, but it worked fine on my '01.
http://<a href="http://www.c5forum.c...elearn.php</a>
Good luck! :cheers:
Veteran
Joined: Jan 2000
Posts: 2,082
Likes: 1
From: Louisville KY
Re: Battery Replacement, then BAD performance (SteveNix)
i changed my last year and had no problems.
make sure the battery is fully charged. just because it's new doesn't guarantee it's fully charged.
make sure the connections are nice and snug.
check out this thread: Mental Note...a low battery.....Everyone touch base....
Phil97SVT
A low battery will make mysterious check engine lights pop up. When I fired my new combo up the battery voltage was pretty low and I imediately got weird codes. PCM failed to communicate, low oil, TCS failed to communicate ect. If you have done work recently and know your battery level is not 100% and get mysterious codes check the battery and charge it. I charged mine and all is good.
Phillip
[Modified by ROCKnROLL, 11:45 AM 8/23/2003]
make sure the battery is fully charged. just because it's new doesn't guarantee it's fully charged.
make sure the connections are nice and snug.
check out this thread: Mental Note...a low battery.....Everyone touch base....
Phil97SVT
A low battery will make mysterious check engine lights pop up. When I fired my new combo up the battery voltage was pretty low and I imediately got weird codes. PCM failed to communicate, low oil, TCS failed to communicate ect. If you have done work recently and know your battery level is not 100% and get mysterious codes check the battery and charge it. I charged mine and all is good.
Phillip
[Modified by ROCKnROLL, 11:45 AM 8/23/2003]
Pro
Joined: Jun 2002
Posts: 725
Likes: 0
From: Rochester NY
Re: Battery Replacement, then BAD performance (markcz)
According to the service manual an Idle Lear Procedure IS required if you disconnect the battery or the PCM looses power.
Here's a link to the procedure I used, it's slightly different from the service manual, but it worked fine on my '01.
http://<a href="http://www.c5forum.c...elearn.php</a>
Here's a link to the procedure I used, it's slightly different from the service manual, but it worked fine on my '01.
http://<a href="http://www.c5forum.c...elearn.php</a>
Not sure why you would need to do that.
Tech Contributor
Joined: Oct 1999
Posts: 41,063
Likes: 9,827
From: Charlotte, NC (formerly Endicott, NY)
Re: Battery Replacement, then BAD performance (Rookiedyn)
The key part of that procedure is the drive 30 miles part. The computer is able to detect and correct for various engine problems without the driver knowing it is happening. If the computer is correcting for a problem in the engine before the battery is disconnected then all of those corrections will be lost and the engine could run poorly until the computer relearns the conditions and corrects for them. If the computer wasn't correcting for an engine problem before the battery was disconnected then the engine will run fine afterwards.
Bill
Bill
Tech Contributor
Joined: May 2003
Posts: 7,035
Likes: 134
From: North Augusta, SC
Re: Battery Replacement, then BAD performance (Rookiedyn)
http://www.c5forum.com/diy/idlerelearn.php
:confused: I changed my battery 3 times without having to do this. That page says "would want to do this if you have done any intake modifications."
Not sure why you would need to do that.
:confused: I changed my battery 3 times without having to do this. That page says "would want to do this if you have done any intake modifications."
Not sure why you would need to do that.
http://www.photohost.org/gallery/dat...nProcedure.JPG
:cheers:
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Thread Starter
Instructor
Joined: Jul 2002
Posts: 211
Likes: 0
From: Cape Coral FL
Re: Battery Replacement, then BAD performance (markcz)
Thanks to everyone for your suggestions and documentation. I have over 150 miles on the car since the replacement of the battery, and it is still running crummy at full throttle, but is smooth with fairly rapid acceleration as long as the throttle is not wide open. I will try the procedures tonight. I wrote in on my business computer, so had to wait until today to get your answers. Thanks again.
Steve Nix
Steve Nix
Drifting
Joined: Jan 2002
Posts: 1,550
Likes: 2
From: Woodbridge VA
Re: Battery Replacement, then BAD performance (SteveNix)
Is it getting better at WOT as time goes by? The reason I as is you may not be at WOT log enough for the computer to make all the corrections it needs to. When I was on a dyno once after doing three pulls I noticed the curve kept getting smoother. I asked why and the guy said because I don't drive at WOT a lot and the computer needs to adjust. It was plain as day on the dyno printouts.
Thread Starter
Instructor
Joined: Jul 2002
Posts: 211
Likes: 0
From: Cape Coral FL
Re: Battery Replacement, then BAD performance (Crispyc21)
I had the chance yesterday to do the relearn procedure. Then I took it out on a back straight road, where I had the opportunity to slow down, go into 2nd gear - and floor it. About 4,000 rpm it started missing, but I kept the pedal down to just under 6,000 rpm, then shifted to third, and floored it again until I got the revs up again (and also was slightly over 90 mph), when I lifted, and coasted down to a resonable speed.
I was able to do this time and time again. The problem did not get better. I guess I should start looking at other possibilities (plugs, wires, etc.).
It must have just been a coincidence that the problem started at the same time I had a battery problem.
Thanks guys, for all your input. Any more ideas?
Steve Nix
I was able to do this time and time again. The problem did not get better. I guess I should start looking at other possibilities (plugs, wires, etc.).
It must have just been a coincidence that the problem started at the same time I had a battery problem.
Thanks guys, for all your input. Any more ideas?
Steve Nix
