A power balance test is a mode you can put the EEC in to see if one or more cylinders are down on power. Basically the EEC shuts off one cylinder at a time and measures the rpm drop. If all cylinders are producing the same power, then there should be no difference
To do a cylinder balance test you need to:
1. Make sure the engine is fully warmed. If in doubt, run engine at 2000 rpm for 2 minutes.
2. Turn the ignition off and wait 10 seconds for system to shut off. Make sure A/C is off and transmission is in Park (automatic) or Neutral (manual).
3. Hook up a test lamp and jumper (or tester if you have one).
4. Start the engine.
5. Engine I.D. should be output.
6. Step on the brake and turn the steering wheel 1/4 turn. .
7. If a "Goose" pulse is received, move throttle quickly to WOT (wide open throttle) and release.
8. Fast Codes are output (ignore).
9. Read the codes.
10.Within 2 minutes of recieving the last code, lightly press the accelerator.
11. If any cylinder is found to be down on power, the EEC will output a code of cylinder number x 10 (ie. cylinder 4 = code 40)