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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: DouglasBeale on October 25, 2018, 12:47:38 PM
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Is this my Electronic Spark Control (ESC) Sensor? I pulled it out of the block - drivers side between, and just above, spark plugs 1 and 3.<br><br><br>
1986 Chevy
K30
350 5.7l
4wd
dually
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If you look carefully you'll see that the sensor in the image actually threads into the cylinder head between cylinders #1 and #3. It is the engine coolant temperature switch (idiot lights) or sensor (gauges). The ESC knock sensor threads into the right side of the engine block above and slightly forward of the starter.
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Thank you. I thought it was the temp sensor, and yesterday I remove it and replaced it with a new temperature gauge, because I only had the light in the dash. But the truck was running real rough and the check engine light came on today. I thought I may have screwed something up... Probably just screwed something else up.