Timing Mark Fluctuating With Spout Removed?

Discussion in 'Fox 5.0 Mustang Tech' started by musclemustangcb, Oct 12, 2013.


  1. musclemustangcb

    musclemustangcb Member

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    I was checking my timing in my 91 coupe the other night, I had the engine running, pulled the spout and shot the light. I couldn't tell What it was set at because it was jumping back and forth. Did I miss a step? I mean it runs good, so I feel mechanically its OK. Just wondering if I didn't do the procedure correctly? Please advise! Thanks.
  2. musclemustangcb

    musclemustangcb Member

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    Well, I just watched a video on YouTube. I pulled the spout out while it was running, that's wrong, and the engine was not up to operating temp. ..that was wrong aswell. Anything else im missing?
  3. jrichker

    jrichker StangNet's favorite TOOL SN Certified Technician Founding Member

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    Setting the timing:
    Paint the mark on the harmonic balancer with paint -choose 10 degrees BTC or 14 degrees BTC or something else if you have NO2 or other power adder. I try to paint TDC red, 10 degrees BTC white and 14 degrees BTC blue.

    10 degrees BTC is towards the drivers side marks.

    Note: setting the timing beyond the 10 degree mark will give you a little more low speed acceleration. BUT you will need to run 93 octane to avoid pinging and engine damage. Pinging is very hard to hear at full throttle, so it could be present and you would not hear it.

    Simplified diagram of what it looks like. Not all the marks are shown for ease of viewing.

    ATC ' ' ' ' ' ' ' ' ' '!' ' ' ' ' ' ' ' ' ' BTC
    ---------------- > Direction of Rotation as viewed standing in front of the engine.

    The ' is 2 degrees.
    The ! is TDC
    The ' is 10 degrees BTC
    Set the timing 5 marks BTC. Or if you prefer, 5 marks towards the driver's side to get 10 degrees.

    To get 14 degrees, set it 7 marks BTC. Or if you prefer, 7 marks towards the driver's side to get 14 degrees.

    The paint marks you make are your friends if you do it correctly. They are much easier to see that the marks machined into the harmonic balancer hub.

    Make sure that you set he timing when the engine is up to operating temperature.

    At this point hook up all the wires, get out the timing light. Connect timing light up to battery & #1 spark plug.

    Remove the SPOUT connector (do a search if you want a picture of the SPOUT connector) It is the 2 pin rectangular plug on the distributor wiring harness. Only the EFI Mustang engines have a SPOUT. If yours is not EFI, check for a SPOUT: if you don’t find one, skip any instructions regarding the SPOUT
    Warning: there are only two places the SPOUT should be when you time the engine. The first place is in your pocket while you are setting the timing and the second is back in the harness when you finish. The little bugger is too easy to lose and too hard to find a replacement.

    Start engine, loosen distributor hold down with a 1/2" universal socket. Shine the timing light on the marks and turn the distributor until the mark lines up with the edge of the timing pointer. Tighten down the distributor hold down bolt, Replace the SPOUT connector and you are done.

    The HO firing order is 1-3-7-2-6-5-4-8.
    Non HO firing order is 1-5-4-2-6-3-7-8

    [​IMG]

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