Wondering if anyone has any advice on installing a knock sensor system into a v6 fiero? I am asking because I am interested in going turbo and have heard of kits that advertise adding a knock sensor. How would you be able to do this without upgrading to a later model computer? The fiero computer doesn't have an input for a knock sensor. What would be the best option?

All the info is in the Archives:

The 85 Fiero V-6 ECM has the capability to handle inputs from the GM ESC module with a knock sensor input. The PROMs from the 6869 ('85) and 7170 ('86-'88) ECMs aren't compatible. In addition to adding the hardware and wiring it in, you will need a new chip programmed to have the knock sensor feature flag enabled. Without a new chip, this setup won't work.

PARTS

'85 GT ECM - GM part # 1226869
Knock sensor is GM part # 10456287
Knock sensor harness connector is GM part # 12102621
ESC module is GM part # 16126761 brodcast code ANRZ
ESC harness connector is GM Part # 12101871

PIc of ESC Module and harness
https://www.fiero.nl/forum/A...040223-2-039168.html

WIRING

On the module you have 5 pins. These pins are labeled A, B, C, D, and E.
ESC signal is fed into terminal B7 of ECM harness.
Wire them into the computer as follows:

A = Not used on Fiero application
B = ECM B1 (power)
C = ECM B7 (knock input)
D = ECM A12 (ground)
E = Connect to Knock Sensor

If you are running boost, you may as well add a 2-Bar MAP sensor at the same time.
2 BAR Map sensor is GM part # 12569241 (AC Delco 213-361)
Map sensor pigtail and lead GM part # 15305891 (AC Delco PT-1035)

Links to forums...

85 ECM & knock sensor
https://www.fiero.nl/forum/A...030531-2-030008.html
https://www.fiero.nl/forum/A...031110-2-036541.html

another good approach is switching to the 7730 ECM. this is going to be my approach. and, I do have an 85, so I have the 85 ECM already, I just think the 7730 is a WAY WAY better & flexable system.