timing specs?
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Senior User
Joined: Dec 2008
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From: East Bernstadt, Ky
timing specs?
can anyone tell me what the timing is on an 82 f100 with a 302 auto tranny? ive searched for it and found anything from 5-16 degrees btdc. thanks for the help guys. also does anyone have or know of any info on tuning a motorcraft 2100 carb (im only guessing this is what i have, matched it up to some pics guess ill never know since it doesnt have the id tag anymore). this is my first non efi truck and im a lil bit lost here. i bought the chilton and haynes manuals but all they have is about 2-3 pics and i have no idea what parts and screws they are talking about when telling how to work on it. thanks again guys
Post Fiend
Joined: Jul 2004
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From: Northern California
Not familiar with the carbs.
However, 10 BTDC is average, but it depends on year and calibration code for your specific application.
Why the timing proceedure is located on the Emissions lable.
Because it really could be anywhere between 5 and 16 BTDC on your specific application.
Good Luck.
However, 10 BTDC is average, but it depends on year and calibration code for your specific application.
Why the timing proceedure is located on the Emissions lable.
Because it really could be anywhere between 5 and 16 BTDC on your specific application.
Good Luck.
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Joined: Sep 2007
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First check to see if your mechanical advance is working - rev the engine up and see if the timing advances further. If it stays at the idle timing, you can do one of two things: set the timing to 30 degrees btdc and hope you don't have hot-start issues or you will have to pull the distributor and clean it up and make sure the advance works properly. If it's working properly, I would set the timing to around 32 degrees tdc at full advance and let the idle advance fall where it may.
Make sure you unplug the vacuum advance when doing all of this or the timing will be way off. If your mechanical advance isn't working you will get horrible fuel mileage and be down on power.
Make sure you unplug the vacuum advance when doing all of this or the timing will be way off. If your mechanical advance isn't working you will get horrible fuel mileage and be down on power.
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Senior User
Joined: Dec 2008
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From: East Bernstadt, Ky
thanks bobzdar so if i am testing the advance will i leave the vacume line connected seems like that would be required. also if that is my problem would i have the buy a new distributor or is there another part that could be bad. how do you set the full advance timing vs. idle timing. sorry for so many questions just want to make sure i get a full grasp on this stuff before i tear into my daily driver.
Post Fiend
Joined: Jul 2004
Posts: 8,786
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From: Northern California
Adjust the timing with the vacuum advance unpluged and blocked at the vacuum hose.
To test the vacuum advance I use the test light. Rev the engine while using the timing light and you should see the marks advance forward. Do this with both the vacuum advance plugged in and without and compare the two. With it plugged into vacuum it should advance a lot more than without.
Mechanical or Centrifugal advance is controlled by springs and how fast the distributor (and engine) is turning. If the springs are worn, it will advance the distributor too much, and you can have fluctuating timing. Best to replace the distributor if this is expected. Wiggle the distributor shaft back and forth, and try turning it back and forth, and if the spring tension isn't tight and it moves freely back and forth, then the springs are worn.
Your ignition module also can affect timing.
To test the vacuum advance I use the test light. Rev the engine while using the timing light and you should see the marks advance forward. Do this with both the vacuum advance plugged in and without and compare the two. With it plugged into vacuum it should advance a lot more than without.
Mechanical or Centrifugal advance is controlled by springs and how fast the distributor (and engine) is turning. If the springs are worn, it will advance the distributor too much, and you can have fluctuating timing. Best to replace the distributor if this is expected. Wiggle the distributor shaft back and forth, and try turning it back and forth, and if the spring tension isn't tight and it moves freely back and forth, then the springs are worn.
Your ignition module also can affect timing.
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Senior User
Joined: Dec 2008
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From: East Bernstadt, Ky
81-F-150-Explorer thanks man ill try that this weekend so does anyone have any info on the carb really gonna try to get this thing running right this weekend while its nice outside....btw its the first day of spring i love crusin around this time of the year
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