[DML] Lambda Circuit and Frequency Valve
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[DML] Lambda Circuit and Frequency Valve



I know there are several posts on here about the issue, but I can't 
seem to understand the issue fully.  I am not sure my Lambda circuit 
or frequency valve is working properly.  I don't know how loud the 
FV should sound.  I do not hear a load buzz when the engine is 
running. I do hear a loud buzz for a second or two from the engine 
compartment but just after I turn the key off. Thus, I am not sure 
what to listen for.

Also, perhaps my engine running symtoms will give a clue.  The 
engine will start right up, but if I try to gas it right after 
starting, there is hesitation like only one or two cylinders want to 
fire as I press the pedal.  Once it warms up more, then the engine 
revs fine as I press the gas pedal.  Is this a symptom of a 
nonfunctioning Lamba system device or FV?  Is there a good step.  My 
idle RPM is about 1000. If I adjust the microswitch to rev lower at 
idle, I get erratic operation and it wants to stall. 

Thanks,

Paul


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