gsx92orion
Probationary Member
- 1
- 0
- Jun 6, 2009
-
irvington,
New_Jersey
Does the 1990 and the 1992 shre the some filter or no
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Following this as a guide, here's the measurements of the units I have on-hand, most I have verified to function in my vehicle.Just thought I would post this for anybody who has one of these little 1990 "tach filters" out where you can get at it with a multimeter that measures capacitance. This is the thing Marty showed in post #4.
This is how your meter should react to it, if the thing is a resistor and a capacitor as proposed in post #21.
You would make these 6 measurements: 3 resistance, and 3 capacitance.
I did this with a known resistor and a known capacitor put together as shown in the diagram, and wrote in what the result of each measurement was.
So anyway, this is how we could probably find out what's inside without taking the thing apart and probably wrecking it. I would measure mine but I can't even see it - hiding somewhere under the intake manifold I guess.
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Following this as a guide, here's the measurements of the units I have on-hand, most I have verified to function in my vehicle.
You must be logged in to view this image or video.
Sample #3 (in the below picture, it is marked 7 and you can see the marking on the top face) is a bit different than the rest so I removed it from this list. It showed a creeping resistance between pins 1-2, but the same readings for all other columns. I think this is the only one I haven't trialed in my car and not real certain where I got it from. Its case is marked / stamped with "HMC" and had some printed on lettering that disappeared when I tried to clean the unit up.
From this list, I know for a fact that samples 1 and 2 are from 1990 DSMs (right-most, with longest leads). Samples 4, 5, and 7 (left-most, with brackets) were from either late 80's / early 90's model Colts. I'm not sure which of Sample 3 or Sample 6 came from a 1990 Hyundai Excel, but one of them did.
So nominal resistor value is likely 2200 ohms and I'd have to say 2 nanofarads for the capacitor based on these measurements.