Will injectors fire if throttle is held down during cranking?
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Will injectors fire if throttle is held down during cranking?
My truck is a 2002 V10. Reason I ask is because she tends to start kind of hard and has a bit of a knock to her when just starting up, and I like to get the oil flowing ahead of time to grease the wheels.
I was told by a mechanic friend that if the truck won't start when you hold the pedal completely to the floor when you crank the engine over, the injectors won't fire.
I guess I'm just worried about fuel getting into my oil. Anybody got an answer for me?
I was told by a mechanic friend that if the truck won't start when you hold the pedal completely to the floor when you crank the engine over, the injectors won't fire.
I guess I'm just worried about fuel getting into my oil. Anybody got an answer for me?
9 ECHO 1
Joined: Aug 2009
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From: Missouri
As a safety measure, the truck shouldn't start if the pedal is pressed to the floor. I'm not sure if it has to be all the way down or there is a specific cut off point.
The short answer; No the truck will not start with the pedal fully depressed.
The short answer; No the truck will not start with the pedal fully depressed.
Postmaster
Joined: Apr 2006
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From: CA Bay Area
My logic would suggest that in drive-by-wire engine control, the computer tells the engine what to do and position of gas pedal during cranking might be simply ignored till the engine fires up.
Than I experienced it several times that my logic and logic of software programmers go into different directions.
The truth is you have to try it, or try to contact factory engineer.
Than I experienced it several times that my logic and logic of software programmers go into different directions.
The truth is you have to try it, or try to contact factory engineer.
9 ECHO 1
Joined: Aug 2009
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From: Missouri
Also, I have started my truck (and another truck) with the pedal partially pressed before. Because of the PCM I think the truck starts normally, then raises RPM once its firing. But that is for maybe 50% throttle position, not 100%
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I've done it before where I held the pedal down and the truck would not start while cranking, my big concern is wether or not the fuel injectors fire. I don't want unburned fuel seeping into my oil.
9 ECHO 1
Joined: Aug 2009
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From: Missouri
Oh I see what youre saying. Well here is my theory. As long as the oil pressure exceeds the fuel pressure, you should be ok
Which, may not be the case. I know the 7.3 has high oil pressure because of the HEUI. What pressure does the V10 operate at?
Is that theory valid?
Which, may not be the case. I know the 7.3 has high oil pressure because of the HEUI. What pressure does the V10 operate at?
Is that theory valid?
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Throttle should not be held down. Gasoline motors run off of vaccum. Vaccum is created when the throttle plate is in the closed position.
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holding the pedal all the way down puts the engine into clear-flood mode and shuts off the fuel supply. if you remember the old carb. cars that was how you started a flooded engine, hold the pedal to the floor. only now its done electronically.
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Hotshot
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From: Pa
Unplugging each injector from the harness and removing the fuel pump fuse will ensure no fuel gets injected. Just unplugging the fuel pump fuse and starting the truck until it dies to remove fuel and pressure from the line should work also. If you do get some fuel in the oil it should be removed after the truck is up to operating temps for decent amount of time.
The SDs did not get drive by wire until 2005.(on the gassers anyway) The 02' V10 has a throttle cable going to the throttle body. Pushing the pedal to the floor opens the TB blade fully.
The SDs did not get drive by wire until 2005.(on the gassers anyway) The 02' V10 has a throttle cable going to the throttle body. Pushing the pedal to the floor opens the TB blade fully.
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From: AZ
Bill64 is correct, if the ECU sees less than idle speed according to the Crank Position Sensor and WOT according to the Throttle Position Sensor, no fuel would be injected. In older systems the ignition would still fire, to clear a flooded cylinder or fouled spark plugs quicker. Due to liability/safety reasons, more modern systems don't fire the plugs or inject fuel in Clear Flood Mode.
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