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Old 10-31-2020, 03:51 PM   #33
forestb
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Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,578
Re: Spark plug diagnosis

So I tried to lower my rpm and adjust my timing to make up for it. When I got lower than 700 rpm by adjusting my timing idle screw, I was not able to increase my rpm by advancing my timing. So I could not get the rpm adjustment screw down any lower than that. I did make a few observations.

1) my timing is set to around 15 degrees advance at 1000 rpm with the vacuum advance unplugged and in park.

2) at 700 rpm it is around 14 degrees when in park and rpm adjusted using the idle screw.

3) with my vacuum advance disconnect I have around 15 pounds of vacuum.

4) when I plug my vacuum advance in (when in park) my rpm goes from 1000 rpm to 1300 rpm

5) when I plug my vacuum advance in (when in park) my vacuum increases from 15 pounds to 20 pounds

6) when I adjust my mixture screws with my vacuum advance disconnect and the ports plugged I was able to adjust my vacuum but it took several full turn to make any kind of difference.
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