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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: DouglasBeale on October 25, 2018, 12:47:38 PM

Title: Is this my Electronic Spark Control (ESC) Sensor?
Post by: DouglasBeale on October 25, 2018, 12:47:38 PM

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

Title: Re: Is this my Electronic Spark Control (ESC) Sensor?
Post by: bd on October 25, 2018, 01:13:09 PM

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.

Title: Re: Is this my Electronic Spark Control (ESC) Sensor?
Post by: DouglasBeale on October 25, 2018, 01:19:39 PM

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.