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Thread: Intermittent/inaccurate RPM signal, no start condition.

  1. #11


    You might have gotten a counterfeit sensor. Sometimes auto parts stores buy super cheap parts which end up being counterfeit. The parts come in boxes that look correct and have printed on part numbers that appear to be correct but they aren't. For critical parts you might want to buy them at a GM dealer or use a name brand that can be trusted.

    If you want to test one of the those sensors, you would hook up power and ground and then use a voltmeter on the sensor wire. That is probably a ferrous sensor so you would bring a piece of steel close to the sensor and then you'll see a voltage on the sensor line. Chevy used 5V and 12V sensors depending on the year so check the Holley wiring diagram to verify what you have.

  2. #12


    Make sure J1-A10 is getting constant power.

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