PCV valve has nothing at all to do with the idle, it does however cause seals to start leaking when it goes bad. I wanted to ground the sensors directly and it worked wonderfully. What got me looking in that area is when i tugged on the harness right there the idle changed. I am pretty sure it is not corrosion that causes it I think the factory crimp connector loosens up over time at that particular point. When it loosens up the tar that is around it works it's way into the connection. The ground wire that I added was less than 3 ft long and it takes less than an hour to make the repair.
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Originally Posted by Bigsyke
couldnt you just replace the harness's ground upstream before the corrosion? I would just be concerned with ground loops, when 1 circuit is grounded in 2 places. however;
I did the same thing on my Civic and it made a huge difference. What I did was trace the engine harness ground back to all the grounded sensors (ones that werent grounded by the ECU), and loomed them up by location. So instead of 1 ground point with 20ft of wiring, it was 5 ground points with 4ft max of wiring.
Also people seem to forget the importance of the PCV valve. It regulates your idle via vacuum, helps with windage loss, vents pressure through the divider vs venting through the head which unburnt fuel will attach onto the heads surface, thining out the oil (petrol). A clogged valve will contaminate your oil, and blow seals. I change mine every oil change. On the ka's I found its not as easy as a honda.
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