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Originally Posted by BNaylor
Are you sure that is a valid test Bo (HotZ28)? By looking at the tach while cranking?  |
Yes Bob, this is absolutely a valid test and I have been using this method for years with excellent results. All of my Ultra & LeSabre tachs respond as soon as I turn on the ignition (the needle moves) and as soon as the engine starts to turn over, (300 RPM) shows clearly on the scale.
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I don't get jack on my tachs on my Regal GS or LS during cranking until the engine fires up. Tried it with all plug wires disconnected too. Nothing.
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If your tachs are not responding, I don’t know what to say, except that you must have some LAZY tachs!
It could be that your tachs operate so often the high side of the scale (5-6K), that they don't like to respond less than 300 rpm.
In my case, rpm's are very easy to see. If the CKPS is working correctly, it will send a crank signal to the ICM from terminal B (Yellow wire) to terminal G of the ICM. In addition, CKPS terminal A (light blue-white wire) provides the sync signal to the ICM terminal H. When all sensors and the ICM are working as intended, the ICM will send the tach signal from terminal “E” (white wire) to the IC tach.
If you have a slow to respond tach, look at engine RPM on a scanner with all ignition wires disconnected. If a crank signal is present, the scanner will show 250-275 rpm when the starter is turning engine over.
Of course,
No (0) RPM, would indicate – no crank signal from the CKPS.
