When it comes to diesel-engine hierarchy, us feel it"s fair to say Ford"s 1994-2003 7.3L strength Stroke engine sit squarely in a middle an are among all of the oil burners that have powered heavy-duty pickup trucks. Favor the 6.0L powerplant that automatically followed that in 2003, the good-old "seven-three" is either love or hated (figuratively) by diesel fans throughout the hobby.




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Per well-documented history, the 7.3L Ford power Stroke engine is a torquey, tireless worker. It"s the proverbial "engine the runs forever," noted maintenance is diligent and also towing/hauling demands that are put on the powerplant space reasonable. The 7.3L power Stroke engine has a dependable internal makeup, no one that supports utilizing it because that high-performance endeavors, there is no it being modified appropriately beforehand.


Despite that is favorable qualities, there space a few chinks in the 7.3L engine"s work armor. Periodically not starting—despite cranking—is among them, and also through years of experiencing the troubles firsthand or hearing indigenous enthusiasts who have encountered no-start nuances, we"ve come to understand what the factors are. In no particular ranking or order, this is our repertoire of those causes.


Battery: A 7.3L Ford power Stroke engine could crank over yet will not start without enough voltage because that the ECM. Short battery power likewise can prevent glow plugs from warming appropriately (in cold climates) and prevent the engine from transforming fast sufficient to fire.
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Engine regulate Module: Yes, an ECM can provide out. And also if/when the does, a no-start problem is definite.
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Cam position Sensor: abbreviated as simply "CPS," it"s a part that doesn"t really end up being a worry until one engine has much more than 100,000 miles. It initially causes a 7.3L Ford power Stroke engine come idle erratically, unexpectedly shut off, and eventually not begin at all. Occasionally, an engine through a bad CPS will at some point refire ~ a truck sits for a while. Verifying a poor one is done by city hall the tachometer together you shot and start the engine. If the needle doesn"t move, the sensor"s done. Us recommend maintaining a brand-new CPS top top standby somewhere in your truck, because again, they typically fail at any kind of time after 100,000 miles space reached.
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Injector Driver Module: The IDM is found on driver"s side of 1994-2003 rigs, usually placed on the fender. Choose the CPS, symptoms of failure are misfiring, shutting off, and not starting. That is thought that moisture or water getting into the IDM are two that the main causes for its failure, but they also can cause no-start conditions when wiring right into the module is damaged.
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Injection press Regulator Valve: The IPR literally is the main vein in a 7.3L Ford strength Stroke engine"s high-pressure oil system. It"s situated in the engine"s valley, attached to the high-pressure oil pump (HPOP). The valve is well-known to stick and also prevent oil circulation to the injectors, the solenoid fails, or seals and also wires somehow become damaged. When it"s a lengthy shot, a retainer seed on the solenoid likewise can loosen. A severely rough-running engine is a symptom that IPR failure, together is the engine not starting due to poor oil pressure for the injectors.
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Injector regulate Pressure Sensor: once an ICP is failing, the engine runs extremely turbulent as fill is applied (under throttle), and the problem can eventually contribute to a 7.3L"s inability to start. Oil air pollution in the wiring generally is the cause. Investigate (it"s threaded into the driver"s-side cylinder head) is the an initial point that diagnosis, and a unique method of verifying the sensor"s failure is to bypass that by unplug the wiring harness (but do not journey in this condition). If the engine operation smoothly through the connector unplugged, the ICP is bad.
Filter: an easy logic here. A blocked/clogged fuel filter not just contributes come a 7.3L Ford strength Stroke engine no starting, it certainly will border the engine"s strength if it does in reality start and also run.
Lift Pump: Again, no fuel, no start. If all is well through the HPOP, CPS, ICP, IDM, and also IPR, looking right into the fuel key while the engine is cranking (a second person is necessary for this). An lack of diesel will conveniently confirm the no-start condition is the result of a pump gift down. In reality verifying cranking fuel pressure with a gauge is the proper diagnosis. The reading need to be 60-65 psi.
Bowl-Heater Element: If this component experiences an electric short and also its underhood fuse (No. 22) blows, the ECM—of all materials that could be affected—is knocked offline, and also the engine will certainly not start. Maxi fuses space inexpensive, and keeping some in the truck to have actually as backups is a an excellent idea.
Injectors: This is a long-shot fueling concern that have the right to lead to a crank-no-start condition. O-ring fail is typical for high-mileage 7.3L Ford power Stroke engines, however injectors will give out if they space not lubricated properly.


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Low-, and also High-Pressure Oil Pumps: The oil level (approximately 1 customs from the height of the investigate window) and also pressure (500 psi) for this mechanism must be precise at all times. A failing LPOP will test with push of much less than 50 psi in ~ idle, and below 100 psi under load. One HPOP is negative when push does no reach a minimum 500 psi.

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