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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 06-04-2012, 04:42 PM
Weberman3 Weberman3 is offline
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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
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  #2  
Old 06-04-2012, 04:53 PM
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Conanski Conanski is offline
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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.
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  #3  
Old 06-04-2012, 06:26 PM
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X2 for what Paul said. Ryan has some info with pics/drawings here: Fuel Injection Technical Library » Setting the timing
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Old 06-04-2012, 09:44 PM
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Originally Posted by Conanski View Post
Find the spout plug in the TFI harness* and remove it to disable computer ignition advance.

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)
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Old 06-05-2012, 07:45 AM
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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

Last edited by Intimnasc; 06-05-2012 at 07:46 AM. Reason: Forgot Truck Info.
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Old 06-05-2012, 08:22 AM
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Originally Posted by RIKIL View Post
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)
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.
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Old 06-05-2012, 08:27 AM
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Originally Posted by Intimnasc View Post
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
Advancing the timing past the factory setting will produce more TQ and improve milage but it also increases the chances of detonation under load. Every motor is different so you'll have to experiment to see what yours will handle, try 2 deg more and then test it under various conditions to see if detonation is audible, and if not try another degree or 2 and test again. When you find the setting that produces audible detonation(pinging) under load then back it off to the previous setting.
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  #8  
Old 06-05-2012, 09:04 AM
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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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Old 06-05-2012, 09:16 AM
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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.
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Old 06-05-2012, 10:15 AM
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It should actually improve your emissions, as long as there is no pinging.
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Old 10-07-2013, 08:19 PM
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so how do you set the timing on a truck that the timing mark bounces all over the place if you dont mind answering? thought I better edit this. I have a 1994 4.9l 5 speed
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Old 10-07-2013, 09:55 PM
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so how do you set the timing on a truck that the timing mark bounces all over the place if you dont mind answering? thought I better edit this. I have a 1994 4.9l 5 speed
The timing is "bouncing" around with the SPOUT removed?
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Old 10-11-2013, 01:22 PM
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I have been told I must be 180* out so now I am gonna set it the opposite cycle. I had set it on compressions stroke tdc so now I am gonna change it. I will tell ya what it does then. I did have the SPOUT out, yes.
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Old 10-11-2013, 01:22 PM
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