Well I got the new alternator on, solid 14V current now. Still couldnt read the duty cycle, so I check the voltage on the O2 and it was still showing .9V. I decided to adjust the air/fuel mixture and lean it out a little. Went too far as the O2 voltage went and stayed between 0 and 0.1. Went a little rich and got the 3-7 fluctuation at idle I was looking for. Hooked up pins 3 and 2 and I got a voltage reading!! Calculated the duty cycle and it seems to stay between 45-50%. My idle is down to 700 rpms again, but the engine seems to be stumbling and running rough at idle. My vac gauge is not pegged in the black at idle, its about 35% of the way over towards the red, so I think I may have a vacuum leak. Would this cause a normal speed, but rough idle?
If so I checked all visible lines, and I cannot find any leaks. I hear the familiar leak sound from the front of the engine it sounds like it is coming from behind the power steering pump. Are there hidden vacuum connections under the intake? I was able to check all connections visible at the top of engine, as well as the distributor, charcoal canister and fuel pressure regulator and they are all fine. I am having a hard time finding an accurate diagram as my car is a 1984 (only year of the motor), and is a manual trans, which looks like that means less vacuum lines than other cars with an auto trans.
I think this has probably had the leak for some time, and the previous owner adjusted the air/fuel mixture all out of whack to try and correct it.
Also noticed my oil pressure is quite low when warm at actual idle, before when it was always idling at 1100-1300 rpms it would sit just below 2. Now at 700 rpms it sits right at 1
I'll changed to oil soon and see if it jumps up at all. Thanks for all of the help so far, could not have corrected this without
1. The help of this board
2. A multimeter
3. About 10 beers