Disconnecting battery
Tech Contributor
Joined: Jan 2007
Posts: 19,454
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From: Dyer, IN
Melting Slicks
Joined: Mar 2003
Posts: 2,512
Likes: 49
From: Franklin IN
Just be sure to pull the negative post first. Pulling the positive can cause a surge and fry components. Before someone wants to argure or flame me about this a GM Certified Wold Class Tech told me this
Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
I install over 2000 batteries a week and the positive is always secured first. 
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Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
On a more serious note, your PCM memory is contained in a FLASH Memory Chip. Once it written, its permanent unless it over written using EFI Live, HP Tuners or the TECH II. Your tune is safe.
Disconnecting the battery can effect the PCM "LEARNED" information. Things like, Long Term Fuel Trims and Idle air adjustments. All those things will rebuild or learn with in a couple driving cycles. You may also loose some of your Set MEMORY settings and your fuel mileage information,
Disconnecting the battery can effect the PCM "LEARNED" information. Things like, Long Term Fuel Trims and Idle air adjustments. All those things will rebuild or learn with in a couple driving cycles. You may also loose some of your Set MEMORY settings and your fuel mileage information,
Instructor
Joined: Nov 2003
Posts: 180
Likes: 0
From: Vallejo CA
No such thing as a stupid question. On a side note, the first time I disconnected and reconnected my battery I got a flock of codes upon restart. Repeated the process only the second time cleaned the threads and the terminal. No codes.
Team Owner
Joined: May 1999
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From: Columbus Ohio
CI 3-4, 8-9-10 Veteran
St. Jude Donor '06-'08-'10
