Engine HEGO stuck on 0.0v

Jack Welch

New Member
Jun 19, 2019
12
0
1
74
AZ
Re -checked the integrity of the HEGO signal wires to the ECU 60 pin connector and HEGO ground wire (orange wire with loop connector from pin#49) from the ECU connector to its attacment at the intake maniflod bolt/stud. Connections and continuity test OK for both. From this I conclude that the HEGO signal and ground circuits are OK, just that I don't get a voltage reading above 0.0-0.1v and no switching at closed loop idle. I'm concluding the exhaust gasses are very lean for some reason(s) I cannot discover, and the HEGOs are driven to reflects this.
Beginning to wonder if there is some kind of fueling problem.
 
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