---

If you have a OBD0 ECU, chipping the ECU might not be such an easy option for you. Almost ALL 90-91 PM6, PM7, PR4 and PP5(with catalytic converter) ECUs had external EPROMs, and are easy to change the program on. Almost all 88-89 PG7, PM6, PM7 and 88-91 PM8 ECUs did not have an external EPROM. It is possible to chip these ECUs, but it requires considerably more work and is beyond the scope of this article. The following ECU is a PM7 that does not have an external ROM:

http://www.pgmfi.org/resources/artic...kyPM7small.jpg



If you are luckier, the ECU you have will look more like this:


http://www.pgmfi.org/resources/artic...chip_small.jpg

---