There is some great informatio
There is some great information here, but it has created a few more questions regarding the DC measurements, "The Bosch FI Manuels state that duty cycle will be 50% when the mixture is stoiometric (14-1)"
If the duty cycle was at say 75%, would this indicate that the mixture was set too lean and the Frequency Valve had to "fire" more to get the mixture to be correct when read at the O2 sensor? It seems to me that the FV is just "fine tuning" an incorrect mixture setting. Question 2, could a car with a DC reading of 75% still be running correctly; the FV is just having to work more to bring the system into spec at the O2 sensor? Question 3; Is there a DC point that you would you recommend readjusting the mixture? My DC figures are almost 75%, but the car recently passed the Ca. emissions test ( I realize this test is after the cat, but there is some relevance with this info)
Thanks,
Mark
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