Originally Posted by
dfe1
Fuel enrichment is used to lower EGTs to which provides some cooling effect to the converter-- in essence the technique is used to drop exhaust gas temperatures below that of the converter's core temperature, which is typically 1,000 to 1,200 degrees F. Typically, when converter overtemp protection is active, commanded AFR is 11.7:1. If your LC-1 is dropping out, my guess is that it's either defective, not calibrated properly or your AFR is way off (outside the range for which the sensor is calibrated). Does the sensor seem to have accurate readings at stoichiometric?