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Tach not working question

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Old 11-09-2008, 06:44 PM
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Default Tach not working question

Does the tach work off the cam or crank? I just put in a new LSX motor and the tach gauge does not work, so I'm wondering if I have a bad sensor or something else is wrong. Thanks
Old 11-10-2008, 10:24 PM
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Originally Posted by Cliff
Does the tach work off the cam or crank? I just put in a new LSX motor and the tach gauge does not work, so I'm wondering if I have a bad sensor or something else is wrong. Thanks
the tach runs off the cam sensor, check the ground from the engine block(behind the altnator) to the frame(driver side under the fuse boxes). also check the pins going into the pcm from the wiring harness. i would go over those first before you pull the intake off to change the cam sensor
Old 11-10-2008, 11:19 PM
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I was throwing a P0336 code which is crankshaft sensor and my tach did not work. My wiring harness had hit my headers.
Old 11-11-2008, 12:00 AM
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Good info! My tach fails to work sporadically and I've always blamed the wiring for my shift light and gauge overlay. I might need to check these other options.
Old 11-12-2008, 10:26 PM
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I'll check them tomorrow and see if I can find the problem. Thanks for the information.




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