"Chipping" an ECU means replacing the program running the ECU. Chipping is just slang. What we actually do is program (or "burn") a new bin file to the ROM to replace the program currently running the ECU.

In order to chip an ECU, you will need the following:

• Soldering Iron - to solder chips in to the ECU
• Desoldering Tool - to remove chips/solder from an ECU. A Desoldering Iron, Desoldering Braid, or a Desoldering Station will also work. Read the Desoldering Tips. If you are uncomfortable doing this, or dont have access to the tools, some of the PGMFI members will sell you a ZIF-Socketed ECU
• Rom Editor - to create new bin file to burn to the Chip
• Rom Burner - to a chip to replace the stock program
• ROM Library - To get some ready made bins
• Chips For ECUs - to burn the new Bin file to - the ATMEL AT29C256 seems to be the chip to get
• Parts For ECUs- is a fairly comprehensive list of the parts needed for ECUs.

Sounds pretty easy eh? Dave B. wrote a great Introduction To ECUChipping article that is an excellent place to start learning about chipping ECUs

NOTE: OBD0 MPFI ECUs do not always have a ROM for you to replace. Don't despair, Chipping An88-89 ECU is possible, too.