How to adjust timing
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Mountain Pass
Joined: May 2011
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How to adjust timing
If anyone can tell me how to or direct me towards an artical for adjusting this. The old man thinks you have to remove a wire and a vacuum line..but we cant find any direct info on it.
Any help is appreciated.
92' F150 5.0L
Any help is appreciated.
92' F150 5.0L
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Assuming you have a timing light and know how to use it...
Attach timing light.
Loosen distributor retaining bolt and ensure the timing marks on the crank balancer are visible.
Start motor and let it settle into a steady idle.
Find the spout plug in the TFI harness* and remove it to disable computer ignition advance.
Point the light at the timing marks and rotate the distributor to the desired setting.
Snug the distributor retainer nut and ensure the timing hasn't moved, and then re-insert the spout plug and ensure computer timing advance is restored.
Shut off motor and disconnect timing light.
*The spout plug is a little grey jumper located in the TFI(ignition module) harness, which will be on the distributor if you have a distributor mounted module, or on the drivers side inner fender near the hood hinge if the truck has a remote TFI.
Attach timing light.
Loosen distributor retaining bolt and ensure the timing marks on the crank balancer are visible.
Start motor and let it settle into a steady idle.
Find the spout plug in the TFI harness* and remove it to disable computer ignition advance.
Point the light at the timing marks and rotate the distributor to the desired setting.
Snug the distributor retainer nut and ensure the timing hasn't moved, and then re-insert the spout plug and ensure computer timing advance is restored.
Shut off motor and disconnect timing light.
*The spout plug is a little grey jumper located in the TFI(ignition module) harness, which will be on the distributor if you have a distributor mounted module, or on the drivers side inner fender near the hood hinge if the truck has a remote TFI.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
X2 for what Paul said. Ryan has some info with pics/drawings here: Fuel Injection Technical Library » Setting the timing
Posting Guru
Joined: Sep 2008
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I would do the previous steps but then turn off the motor, remove the spout plug and then start the motor to check the timing. Was that wrong or can it be done both ways? (you had the motor running when you pulled this plug)
Senior User
Joined: Apr 2012
Posts: 425
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From: Fort Worth, Texas
At the risk of not wanting to hijack your thread I had a couple of questions on this issue. I have read where some people set their timing a little higher at say 12 degrees or so. If I do this what are the pros and cons as far as mileage versus towing and such?
1994 F150 4.9L E40D
1994 F150 4.9L E40D
Last edited by Intimnasc; Jun 5, 2012 at 07:46 AM. Reason: Forgot Truck Info.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
There is usually no issue with doing it either except that sometimes the motor is harder to get running with the advance disabled. There is no harm in removing the spout while the engine is running, it may set a code but clearing that is easy, so shutting it off to remove or replace it is just another unnecessary step.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
At the risk of not wanting to hijack your thread I had a couple of questions on this issue. I have read where some people set their timing a little higher at say 12 degrees or so. If I do this what are the pros and cons as far as mileage versus towing and such?
1994 F150 4.9L E40D
1994 F150 4.9L E40D
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Senior User
Joined: Apr 2012
Posts: 425
Likes: 1
From: Fort Worth, Texas
I'm sorry one more question and I'll quit asking so as not to take over the thread. I still live in an area with emissions testing, Will this effect my emissions negatively?
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Mountain Pass
Joined: May 2011
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It shouldnt affect your emmisions if you do it right, as in still having good combustion and no detonation. if you get spark to soon I think it causes incomplete burn which is bad for emmisions.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
The timing is "bouncing" around with the SPOUT removed?
Posting Guru
Joined: Sep 2008
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You should have a connector called a SPOUT connector, you will need to find out where it is on your vehicle, a google search should help. Once you find it, warm up the motor completely, turn off the motor, unplug the spout, start the motor and check the timing. Turn off motor and replace SPOUT when done.
When you remove the SPOUT, that is your base timing, the computer isn't adjusting for timing at all. When the SPOUT is connected, it tells the computer to control timing. You won't be able to get an accurate timing reading with the SPOUT connected because the computer will constantly adjust the timing as needed.
When you remove the SPOUT, that is your base timing, the computer isn't adjusting for timing at all. When the SPOUT is connected, it tells the computer to control timing. You won't be able to get an accurate timing reading with the SPOUT connected because the computer will constantly adjust the timing as needed.