I continue to have this issue. Last night I was driving 45 mph using cruise for a 20 mile section of road and the tach redline (it was actually yellow) sat around 5500 rpm almost the entire time. Got on the freeway at 80 and the redline went to 6500 occasionally dropping down and going yellow...
Those are the two that charge fine for me when using multiple components on my phone. I have other cars that have the same issue you have. The power standard for USB changed at some point. You probably have the older, reduced power ports.
They are probably the older lower power plugs. I have a 17 and have no problem running GPS, playing music and charging using the plug in the center console. Never tried the ports behind the screen, which are the ports I think you are talking about.
Good luck with your C3. I loved my 77. Good luck in your quest to find a mechanic familiar with the older cars. They can be hard to find but once you do, they are worth their weight in gold.
I had the dealer recommend injector cleaning and posted about it here. I don't want to put words in his mouth, but my recollection is that GMJunkie responded that it wasn't necessary and to simply run a bottle of Techron through it when the oil is changed.
I have a 2017 GS. Recently I've noticed that the red line for my tach has been changing on me. Starts low and then as the car warms up it moves to the 6500 mark. It will then drop down for a period of time and then go back to 6500.
I drove for about 15 miles tonight and the car was...
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