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Help-tach not working right

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Old 04-03-2008, 06:49 PM
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Help-tach not working right

When sitting still my tach reads about 100 rpm. Sometimes a little higher. What is the idle supposed to be? It used to read a little over 1000 rpm.
Old 04-03-2008, 07:20 PM
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Idle should be about 750 rpms.

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Old 04-04-2008, 12:12 PM
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What was the cause? I'm having similar issues
Old 04-04-2008, 12:34 PM
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I had issues with the tach jumping around at idle between 400rpm-750rpm. My truck kept popping camshaft sensor signal codes everyday. I replaced the sensor and when I did I realized the TST wire harness that plugs into the cam sensor wasn't fully locked. The orange tab was not fully engaged in the connector. It took a while but I finally got it engaged and the rpms on the tach are dead set on 700 rpms all the time at idle.
Old 04-04-2008, 03:37 PM
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Originally Posted by zuki_dan
I had issues with the tach jumping around at idle between 400rpm-750rpm. My truck kept popping camshaft sensor signal codes everyday. I replaced the sensor and when I did I realized the TST wire harness that plugs into the cam sensor wasn't fully locked. The orange tab was not fully engaged in the connector. It took a while but I finally got it engaged and the rpms on the tach are dead set on 700 rpms all the time at idle.
Thanks! I did not get any codes, but I'll check the plug if I can find it.
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