[DML] Re: The Flickering Tach, High Hunting Idle Challenge

["Harold McElraft" <hmcelraft@xxxxxxx>]

The pick-up coils have some history of failure. It would appear that 
adding resistence across the coil is putting the pick-up range for 
the ECU back into spec or into a readable range. Did you check the 
induction coil resistance (895-1,285 ohms)?

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, doctorDHD@xxxx wrote:
> 
> Well I put a scope on the input to the ignition ECU and found that 
when I  
> put the 2.2uF cap across the pickup coil it reduces the amplitude 
a bit and  
> makes it look smoother.  Again this smoothes out the idle and no  
flickering.
>  
> Now for the next part of the puzzle.  Today I put a 390 ohm 
resistor  across 
> the pickup coil and it also "cures" the problem and it works at 
all RPM  
> ranges.  I could leave it that way but I know something is wrong. 
The  question is 
> what?
>  
> I have been trying two different ignition ECUs.  Do they both have 
the  same 
> weird problem?  Is it the pickup coil itself?  I tried added  
grounds to the 
> ECU and also replace the wire from the pickup coil connector to  
the ECU.  No 
> change.
>  
> Any  opinions?
>  
> D² &  6530
> 
> 
> [Non-text portions of this message have been removed]








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