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Old 06-12-2017, 07:52 AM   #93
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Join Date: Oct 2011
Location: summerville, south carolina

Originally Posted by DET17 View Post
Cylinder head sensor grounds..... as he said, they go on each side of the back set of tiny valve cover studs. Many things on these engines have 0-5 VDC sensor, and you can't have too much ground back to the battery. The Volvo electrical engineers put them there for a reason.
This is good news, as several people have mentioned my high idle could have been caused by the engine coolant temp sensor. I've replaced it to no avail. But maybe it needs those better grounds. Will report back.
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