Question about 1999 Ford Super Duty F 450

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The motor works but doesn't have enough power it is a 2000 7.3 diesel and sounds like is working only in four cylinders

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Have someone test the injectors, they are to a diesel engine as spark plugs are to a gas engine.

Posted on Aug 04, 2010

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On my 1990 Isuzu 4-wheel drive pickup I got a 2.0 four cylinder motor in it start knocking I got a chance to buy 2.8 liter V6 grover v 6 interchange with the four-cylinder


can be done with a few mods

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1 Answer

7.3 diesel cranking over more than my v-10 is that normal


Yes, it IS normal for a powerstroke diesel to require more revolutions of the motor to fire than for any gasoline engine. Combustion in gasoline engines is stimulated by spark plugs and many gasoline engines will start with little turning of the motor past the position where the ignition timing creates the spark and combustion occurs. Combustion forces the engine to continue rotating and combustion in that and other cylinders becomes a perpetual event. A Powerstroke Diesel engine requires more revolutions and speed of revolutions to create the heat necessary to cause the diesel/air mixture to combust. ALSO, the diesel is injected into the combustion chamber, at high pressure, by the injectors. The injectors are electronically controlled and the Fuel Control Module (computer) (also known as the Injector Control Module or ICM) tells each injector exactly when to open and inject diesel into the combustion chamber, as well as for how many milliseconds it stays open (how much fuel will be delivered). Summary, a powerstroke diesel will only begin the perpetual combustion process when the motor is turning fast enough and the pistons are compressing the volume of the cylinder into the tight space of the combustion chamber rapidly enough to create enough heat for the fuel to ignite and begin creating power to turn the motor without the aid of the starter. IN ADDITION, a Powerstroke will NOT start at all with weak batteries. Not only does the motor need to revolve rapidly in order to start, the injectors require a MINIMUM voltage of MORE THAN 12 volts in order to activate (open). The exact amount of voltage required can be different, depending on the Fuel Control Module (FCM) or "Injector Control Module" (ICM) type that is installed. (Note; terminology for the FCM / ICM tend to depend on who you are talking to, what resource you are reading, etc. They are the same thing.) If batteries are weak, the starter uses enough amps to drag the voltage down and, even though the starter turns the motor fast enough that any gasoline motor would fire right up, the ICM will never send the signal to the injectors for them to activate so, the cylinders never get any fuel and the motor never fires. I hope that helps. Yes, a 7.3L diesel will normally need to turn with the starter for longer than your gasoline fueled V10.

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1 Answer

My year 2000 diesel escort van wont turn over


sounds like cylinders are full of diesel you need to pull injectors to relieve pressure on cylinder.. it causes it to lock the engine up .. you might have left the key on with a leaking injector and filled the cylinder with diesel and then it would lock you engine.

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Ford diesel


Please write back with Year, Model, and maintenance history of your vehicle. At this point all I can suggest is the basics. Oil level and condition is very important. Please check that the oil doesn't need to be changed. Also check the fuel filter. It is also very important that the fuel flows freely and at the right pressure. After that, you will need to get into more diagnostics. You may need to confirm that the engines compression is exceptionable (on all cylinders), that all four injectors are working, and that the injection pump is building enough pressure. Please write back with what you have found. Feel free to ask any questions, I'll do my best to help, good luck.

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2000 gmc jimmy drivers window doesn't work but all others work


With key on door open, hold switch in down position and rap door panel with rubber mallet...if it works, need motor, if not, check switch for power out to motor

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P0305 misfire in cylinder 5


take the main pulley off and the harmonic balencer off and re-time the marks on the timing chain to make sure that your timing marks are perfecto if that doesn't help then re-time your distributor with the distributor gun if that doesn't help replace the spark plug and wire in cylinder 5 and if that doesn't work then you are probably gonna have to take the motor apart and replace the rods or bearings or valves

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Subaru Outback - '03 boxer 2.5L engine sounds like a diesel


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Robert

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1 Answer

2000 cherokee wont start


Timing The ignition system on your car has to work in perfect concert with the rest of the engine. ­The goal is to ignite the fuel at exactly the right time so that the expanding gases can do the maximum amount of work. If the ignition system fires at the wrong time, power will fall and gas consumption and emissions can increase.
When the fuel/air mixture in the cylinder burns, the temperature rises and the fuel is converted to exhaust gas. This transformation causes the pressure in the cylinder to increase dramatically and forces the piston down.the spark should occur before the piston reaches the top of the compression stroke, so by the time the piston starts down into its power stroke the pressures are high enough to start producing useful work.

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