Weak Performance after Battery Replacement

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Apr 9, 2011 | 08:35 AM

#21

Mez

Safety Car

Joined: Jun 1999

Posts: 3,570

Likes: 3

From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas

Quote:

Originally Posted by Bill Dearborn

It has been that way since they started using computers to control engines. It works great and allows the computer to adjust to the engine as it ages and wears to keep it at its maximum efficiency.

Bill

...and different air temperature and density from day to day.

Apr 9, 2011 | 12:03 PM

#22

vetteright

Drifting

Joined: Apr 2010

Posts: 1,507

Likes: 76

From: Marshall, Missouri

Quote:

Originally Posted by Bill Dearborn

As the operating characteristics of the engine change over time the PCM learns reacts to those changes by changing what part of the tables it uses for certain air flow and load conditions. When you pull the battery these changes are erased. When you start the engine the PCM will relearn them over a short period of time. It has been that way since they started using computers to control engines. It works great and allows the computer to adjust to the engine as it ages and wears to keep it at its maximum efficiency.

Bill

I'm sure that you are correct; I'm just saying that I had no noticeable difference in performance after I changed my battery. It ran strong before and it did afterward. No change.

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