In response to this old classic thread involving the Cap'n trying to get his 124 running, I decided to try to understand and go through all the tests discussed at this wonderful thread, found at:

http://www.peachparts.com/shopforum/showthread.php?t=53987

Here is a summary of my procedures & results (more detail page attached as PDF to this post):

02 Sensor @ Idle: .78V
02 Sensor w/ Computer side grounded: .82V (simulating too lean condition)
02 Sensor w/ 1V applied to computer side: Drops to 0V within 5sec (simulates too rich condition)

EHA @ KOEO: 19.75mA
EHA @ Engine Idle, O2 Sensor disconnected: 0mA
EHA @ Engine Idle, O2 Sensor disconnected, computer side of O2 sensor grounded: 13.69mA
EHA @ Engine Idle, O2 Sensor disconnected, 1V applied to computer side of O2 sensor: -10mA

ICV @ Engine Idle: 316mA

Duty Cycle @ Engine Idle: 41 - 45%
Duty Cycle @ 2000RPM: 42 - 49%

I readjusted duty cycle to make it slightly more lean after these tests were complete. Now duty cycle is 46 - 52%

I'm curious about the ICV value, as I thought it should be between 600-700mA at Idle.

Also, I would have thought O2 sensor would come close to .45V average. Not sure why it's tending toward .78V, but seems to respond very quickly to various inputs.

Anyone care to comment on these numbers?

Attached Files

Duty Cycle, O2, EHA Testing.pdf (46.1 KB, 375 views)

__________________
Steven
1989 260E (276K miles)
1995 E320 (50K miles)