Do you have to disconnect the battery before putting in a new chip, or can I just unplug the wires at the back of the ECM and put the new chip in?

What is the right way.

Thanks.

 

I just flip the lever on my Craig Moates adapter and pop the chip in, I don't disconnect anything. 30+ chips later, it's still working fine.

 

Thanks.

But does anybody know what does other 2 smaller chips are for.

I thought that you had to disconnect the power to the ECM to clear the learned memory.

Or does the memory clears automatically when I put in a new chip?

 

I think that disconnecting power to the ECM will reset the BLM's to 128, however, why bother? If you've made fuel changes your BLM's will just change to their new "best" value and your INT should keep the mixture pretty close until that happens. I've been using Craig's adaptor for maybe 10 changes so far w/o any problems.

 

I always pull the ECM power fuse when changing chips. Just an added safeguard. You really dont want any voltage on the socket when inserting the PROM. All it takes is a little ESD, and goodbye Eprom! It also resets all the data that the ECM had learned, starting over.

 

For a test on ESD, (electro static discharge) I walked around with my shoes on rubbing them against the carpet. This builds up enough to throw a bit of lightning to anything grounded. I then discharged this into my chip. I then stuck the chip into the pocket programmer and to my surprise the data was still good.

 

The ecm only need reset when the injector contant and/or other global changes.There is a reset line on the ecm circut you can hardwire to a switch and reset the ecm without unplugging it or the battery.Don't try the reset line thing though,just unplug the ecm for 30 sec after major changes in the prom.

 

If the injector constant is kept in the PROM you just replaced, the only reason I could see to power down after that change is to reset BLMs... which reset themselves fairly soon after running the new chip anyway.

For some reason my driver's seat is the biggest source of ESD in the world (probably has to do with the power seats). I usually tap my shifter to discharge, then I keep one hand on the ECM casing while I swap chips. Hasn't failed me yet.