Remote starting bad for CP4?
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Tuned
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Remote starting bad for CP4?
Has anyone ever hooked up a fuel pressure gauge to see how long it takes the lift pump to build pressure once you turn the truck to the "ON" position?
We do so many things to try to protect the CP4, but I'm wondering if some simple things are overlooked. I noticed with remote starting, it essentially starts the engine right away. I feel like if we "wait to start" the engine a few seconds, it gives the lift pump time to build pressure to prevent the CP4 from running dry. It'll add up over time.
We do so many things to try to protect the CP4, but I'm wondering if some simple things are overlooked. I noticed with remote starting, it essentially starts the engine right away. I feel like if we "wait to start" the engine a few seconds, it gives the lift pump time to build pressure to prevent the CP4 from running dry. It'll add up over time.
Cargo Master
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Not only that check valves, but you would need air between the cp4 and the injectors. The vacuum alone would hold the fuel in place. Now if you would a leaky injector air could in theory, but the check valves would hold the fuel between the filter housing and the lift pump to the CP4. Now of your injectors are leaking down, You have other issues.
Lead Driver
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From: The Great State of Texas
To his point, If the fuel backed away from the CP4, The truck would stumble with air as the lift pump caught up.
Not only that check valves, but you would need air between the cp4 and the injectors. The vacuum alone would hold the fuel in place. Now if you would a leaky injector air could in theory, but the check valves would hold the fuel between the filter housing and the lift pump to the CP4. Now of your injectors are leaking down, You have other issues.
Not only that check valves, but you would need air between the cp4 and the injectors. The vacuum alone would hold the fuel in place. Now if you would a leaky injector air could in theory, but the check valves would hold the fuel between the filter housing and the lift pump to the CP4. Now of your injectors are leaking down, You have other issues.
Lead Driver
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It sounds like the OP is describing the difference between hitting the start button, waiting, then placing foot on the brake and pressing the button again. Versus remote start, which is essentially the same as placing a foot on the brake and pressing the start button.
I have always hit the start button first with foot off the brake, pausing for several seconds, before going ahead and actually firing it up with foot on the brake. Not with CP4 in mind, that's just how I have always done it. Ford actually had an instructional video describing this method of starting a push button start vehicle. I believe it was for the diesel F-150, but I could be mistaken.
I have always hit the start button first with foot off the brake, pausing for several seconds, before going ahead and actually firing it up with foot on the brake. Not with CP4 in mind, that's just how I have always done it. Ford actually had an instructional video describing this method of starting a push button start vehicle. I believe it was for the diesel F-150, but I could be mistaken.
Lead Driver
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One could say, the remote start process could be better for the CP4 in extreme cold temps, because if the truck determines if the glow plugs need to turn on due to ambient temps, it will allow the glow plugs to turn on for a bit and then start the truck. This additional glow plug on time will ensure that the CP4 has full input fuel pressure from the lift pump which can't hurt.
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Lead Driver
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If you don't press the brake, the truck will just go ignition on, but not in to a start mode, so you aren't doing anything other than burning battery. The Glow plugs only come on in a start mode, foot on the brake and button pressed, or remote start mode. Keyed ignitions might go to glow on in the run position, don't know haven't had one since 2012.
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Lead Driver
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When I did forscan changes, I always saw the GP symbol too, even though it was warm enough not to need them. Doesn't mean they are actually active though. I have the shop manual, maybe the information is in that in one of the diagnostics. Reason I think they don't activate when not in engine start mode is to protect the battery. GP draw a lot of energy.
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Tuned
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I've got a mechanical fuel pressure gauge on my 12 valve Cummins, along with an Air Dog fuel pump. I could start that truck right away too since there is fuel in the lines, but on a cold start it takes 2-3 seconds for the Air Dog to start building fuel pressure.
I guess as long as the CP4 cam/lifters are submerged in diesel when it starts turning, then it's fine. However, I bet the Ford engineers figured out some mathematical formula that takes into account inlet flow/pressure through the CP4 to keep it lubricated to compensate for the lower lubricity of US diesel. Maybe it doesn't work that way, but we also don't really see any unusual CP4 failures on these Fords. They've figured something out.
I guess as long as the CP4 cam/lifters are submerged in diesel when it starts turning, then it's fine. However, I bet the Ford engineers figured out some mathematical formula that takes into account inlet flow/pressure through the CP4 to keep it lubricated to compensate for the lower lubricity of US diesel. Maybe it doesn't work that way, but we also don't really see any unusual CP4 failures on these Fords. They've figured something out.
Lead Driver
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Just for kicks this morning I didn't press the brake pedal, just the PBS. Screen lit up but no GP icon. Turned it off and started it as normal, and saw the GP icon. Maybe Ford changed it in the 23 MY to not show the GP unless it is actually lit. I know the 2019 did show it on the dash, even though no power was applied.
Tuned
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From: WI, USA
I thought all of the indicators turned on then off upon turning the vehicle "on" whether starting or not. This happens on any car I've touched in a long time. It's how you can tell if someone has disabled the check engine, ABS, airbag, etc. light... I haven't specifically looked for the glow plug light though, I admit.
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