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May be a stupid question, but.........

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  • May be a stupid question, but.........

    After installing the V3 in my 7.3, I was surprised to discover the engine would not rev during auto shutdown. I thought there was a completely mechanical linkage between the go pedal and the engine (step on the gas and engine speeds up). Didn't realize something electrical could change that.

    The other thing that happens when shutting down is that all my gauges die. It still makes me a bit nervous to have the engine running while seeing no engine oil pressure on the gauge. I am assuming that the oil pump is mechanically driven by the engine and is not affected by anything electrical. However, I will feel much better with comments from people here that know these engines to verify that.

    I am hoping to change wiring soon to allow revving and full operation of gauges. Until I get that done, the peace of mind knowing that my 7.3 is still getting oil pressure even with the gauge showing none, will be comforting. - Patrick

  • #2
    Thats weird......mine revs and all the gauges work when its purging after shutdown.

    The easiest way to tell that u still have oil pressure is the fact that the engine is running at all.

    In a 7.3, no oil pressure = no run
    Even if you just let the oil level get too low...itll cut off
    -Shawn Collister-
    -02 F250 7.3 - SSB V3, AC's tuned by Swamps, AIS, 38R, 4" ex, DI tranny
    -00 F350 7.3 - CC with no back seat
    -Multiple trailers and a bunch of other junk
    Straight outta Wimauma

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    • #3
      Originally posted by Tampa450 View Post
      Thats weird......mine revs and all the gauges work when its purging after shutdown.

      The easiest way to tell that u still have oil pressure is the fact that the engine is running at all.

      In a 7.3, no oil pressure = no run
      Even if you just let the oil level get too low...itll cut off
      Tampa,
      I believe it is the 99-01 years that don't rev and gauges shut down (there may be a fix coming from a discussion in another thread). Thanks for the info. Didn't know the 7.3s had an automatic shutdown switch if oil gets low. Do you know if that is year specific or if for all 7.3s? Any possibility that switch could be disabled when the key is turned off to initiate auto-shutdown? - Patrick

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      • #4
        From what I understand the injectors are run by the high pressure oil pump (HPOP). No oil pressure=no injectors=no run. That's why the early 6.0s would just die going down the road, the fitting on the hose feeding the HPOP would let go and there was no more injectors. So as far as I see it, if your engine is running you should be oiling just fine. And it sounds like Jason and James know how to rewire your truck so you will be able to rev during shutdown, just contact them.

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        • #5
          I don't know why this happens (and really havent been motivated to find out) but on my truck, upon shut down (key off and purge begins) all my electronics are dead for approx 30 seconds...i have on occation forgotten to roll up the window before keying off and i have to wait and after whatever process is going on finishes in that 30 second time, my electronics all come back on. The radio, all guages, windows...eveything. IF this is the same case with the 7.3s, see if the throttle control works after your other electronics come back up.

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          • #6
            Mine does that too Clay.

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            • #7
              Originally posted by VTVegiPower View Post
              From what I understand the injectors are run by the high pressure oil pump (HPOP). No oil pressure=no injectors=no run. That's why the early 6.0s would just die going down the road, the fitting on the hose feeding the HPOP would let go and there was no more injectors. So as far as I see it, if your engine is running you should be oiling just fine. And it sounds like Jason and James know how to rewire your truck so you will be able to rev during shutdown, just contact them.
              Good point. Thanks. - Patrick

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              • #8
                One thing I noticed today as I was letting the truck idle while I prepared to go into the house was that if I let it idle for a little bit with the key on and then before the high idle kicked on I pulled out the key, it hit the high idle with the key out. I think this helped burn some oil out of the heads. I still haven't had problems with hard starts while using a block heater though so I haven't felt the need to rev before shutdown.
                Unless this post was strictly about no oil pressure during purge/shutdown. That would make my post irrelevant.
                Vegistrokin since 08/23/08

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                • #9
                  Originally posted by VTVegiPower View Post
                  From what I understand the injectors are run by the high pressure oil pump (HPOP). No oil pressure=no injectors=no run. That's why the early 6.0s would just die going down the road, the fitting on the hose feeding the HPOP would let go and there was no more injectors. So as far as I see it, if your engine is running you should be oiling just fine. And it sounds like Jason and James know how to rewire your truck so you will be able to rev during shutdown, just contact them.
                  Got to thinking more after I posted a reply to your post.... I believe that the high pressure oil pump operates from a reservoir of motor oil supplied by the engine oil pump. I would guess there is sufficient oil in that reservoir to run the injectors for a period of time even if the engine lost oil pressure. It's just a little disconcerting to see "0" on my oil pressure gauge with the engine running. Think I'll take your suggestion to check in with Jason and James for rewiring directions. - Patrick

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                  • #10
                    Originally posted by lancaster,pa View Post
                    Got to thinking more after I posted a reply to your post.... I believe that the high pressure oil pump operates from a reservoir of motor oil supplied by the engine oil pump. I would guess there is sufficient oil in that reservoir to run the injectors for a period of time even if the engine lost oil pressure. It's just a little disconcerting to see "0" on my oil pressure gauge with the engine running. Think I'll take your suggestion to check in with Jason and James for rewiring directions. - Patrick
                    Its fine, just guages shutting down. Electronics won't shut off your flow of oil as long as the engine is turning and there is oil in the sump, it has pressure.

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                    • #11
                      Originally posted by CHenry View Post
                      Its fine, just guages shutting down. Electronics won't shut off your flow of oil as long as the engine is turning and there is oil in the sump, it has pressure.
                      Thanks Clay. Peace of mind. - Patrick

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                      • #12
                        FWIW, on my 05 6.0L, all electronics die for about 10 seconds, but I can still rev the engine. 10 seconds pass and then I can turn everything back on if I need to.

                        As Clay mentioned, I don't have a clue why it does that, but it does.
                        Greasin & Grinin
                        Vegi oil powered since Aug 08
                        2006 F-250 PSD - CC, Lariat, 4X4 - Vegistroke converted 1/27/13!!
                        2008 F-250 PSD - CC, Lariat, 4X4 - Sold
                        2005 F-250 PSD - CC, Lariat, 4X4 - Sold

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