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I hope I can get some info on what I believe to be a tach filter on my 82 crossfire. I found l that is not hooked up to anything. One side the plastic connector broke off and the other end is not plugged into anything. The tach seems to work fine. Is this filter really needed. It looks like it broke off years ago. Any thoughts?
I would replace it.
Make sure it is bolted to manifold ground too.
i had a nasty voltage spike on one of my replacement boards..and i had a filter on! Fried board , bright flash, and smelled bad,I thought i was on fire
I see what someone did.
The original filter either failed or someone thought it wasn't needed.
So the engine harness that has the Tachometer wire is not long enough on it's own to reach the TACH cell of the distributor cap.
Whoever thought the filter was faulty or wasn't needed clipped the wire very very close to the connector at the distributor. Same one I thought you may need but I see you have one.
So they used the TEST port pigtail to land the engine harness Tachometer wire to.
What they did was completely bypass the filter doing so.
Same filter you could have purchased from the dealer years ago.
GM #14020025
I see what someone did.
The original filter either failed or someone thought it wasn't needed.
So the engine harness that has the Tachometer wire is not long enough on it's own to reach the TACH cell of the distributor cap.
Whoever thought the filter was faulty or wasn't needed clipped the wire very very close to the connector at the distributor. Same one I thought you may need but I see you have one.
So they used the TEST port pigtail to land the engine harness Tachometer wire to.
What they did was completely bypass the filter doing so.
Same filter you could have purchased from the dealer years ago.
GM #14020025
Thanks, I believe you are correct. It was definitely cut, probably defective. Anyone have an extra one that they wouldn't mind selling. I see a few online, Anyone use the Rodney Dickman one? It seems to look the closest to the original.
Without testing your original filter you just don't know why it was bypassed.
Why spend $30.00+ if there is nothing wrong with the original...
If the original tests good, you just need a F/M series 56 1/4" crimp terminal.
Real simple test but you need a meter, you want approximately 15,000 ohms across both wire leads.
Yes I have tried both the Rodney and the filter Zip Corvette sells, both ohm out the same
Used Rodney Filter:
New Zip Filter:
Without testing your original filter you just don't know why it was bypassed.
Why spend $30.00+ if there is nothing wrong with the original...
If the original tests good, you just need a F/M series 56 1/4" crimp terminal.
Real simple test but you need a meter, you want approximately 15,000 ohms across both wire leads.
Yes I have tried both the Rodney and the filter Zip Corvette sells, both ohm out the same
Used Rodney Filter:
New Zip Filter:
I tested the filter and it continually fluctuates. Obviously defective and will order a replacement.
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82 crossfire tach filter
