Ignition Timing
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Freshman User
Joined: Dec 2001
Posts: 38
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From: North Highlands USA
Ignition Timing
I have set the ignition timing for the 351M in my 77 F150 4X4. I set it by removing the vacuum line from the distributor, and plugging the line. I set it to about 6-8 BTDC ( I have to have it smogged otherwise I would set it at 10-12). After I have set it, I re-installed the vacuum line to the distributor, and re-started the engine. With the vacuum line re-installed, the tiing should advance based on the idle speed, correct? Mine isn't, is this because of a faulty vacuum advance diaphragm, o0r something else??
Help!!
Thanks,
Rich
Help!!
Thanks,
Rich
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Ignition Timing
You can also check the vac advance unit by hooking it to a temporary full vac source. It can also be tested by a hand held vac pump or by "shadetree" lung power.
You may have a couple of vacuum switches in the line also. Depending on how it is hooked up they may be bad. Check your vacuum diagram sticker and a manual.
You may have a couple of vacuum switches in the line also. Depending on how it is hooked up they may be bad. Check your vacuum diagram sticker and a manual.
