Hi
I took an analog dwell meter and connected it to the test connector near the cold start valve. Thinking about it I didn't consider polarity, so I am not sure if I measured positive or negative duty cycle. Negative duty cycle is the time the signal is low.
On the 4 cylinder setting the dwell bounced between 36 and 40 degrees. The duty cycle would be the dwell reading divided by 90. So the measured duty cycle was 36/90 = 40 % and 40/90 = 45%. So 40-45%.
This was measured at an idle rpm of around 1100 rpm.
Is this slightly on the rich side? Should I leave everything alone?
The reason I checked this was yesterday I unplugged and replugged alot of the connections such as the o2 sensor, all the connections to the coil, the cold start valve, thermo time switch, aux air regulator and the oxygen sensor thermo switch. I also pushed in on the injectors. The reason I did this is because the car is old and thought that some of the connections might be slightly oxidized and not making good contact.
The result of the above is that I have a higher idle and tons of power and tons of throttle response. The car has tons of power now. I checked the timing and it is dead on. I thought that something might have failed and that the car was running super rich.
The car starts fine cold and hot.
At first I thought something must have failed but thinking about it maybe I fixed something. The car has been sluggish and I got use to it, now there is tons of power and throttle response.
I will check a few additional things like the aux air regulator to be sure that it closes when it warms up. I will also check to see the idle speed boost switch is off and not adding more air into my intake. Not sure if I should bother to measure the fuel pressure both hot and cold. I guess if I am anal enough I would.
Any ideas?
Thanks James