Engines prone to stiction issues are the PowerStroke 73 engine from 1994 to 2003 the 60 from 2003 to 2007 the Navistar T444E and especially the VT365 which was manufactured from 2003 to ID: 392320
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Slide1
HEUI Fuel Injection Failure and SolutionSlide2
Engines prone to stiction issues are the
PowerStroke 7.3 engine from 1994 to 2003, the 6.0 from 2003 to 2007, the Navistar T444E and especially the
VT365 which was manufactured from 2003 to 2007. Q:What is
stiction?
A:A conjunctive form of Static FrictionAs it relates to injectors, it is simply pistons which stick in their bore, to a level which retards the initial movement.
The Documented ProblemSlide3
The 6.0L runs the high pressure engine oil system much higher than it was in 7.3 L
PowerStrokes
“4000 psi” causes shearing of oil polymers reducing a 15W40 viscosity oil to a 30 weight in as little as 1,000 milesCan result in increased exposure to wear because of reduced lubrication protection Slide4
Contains extreme high-pressure engine oil system
High-pressured oil pump is used - HPOP
Pump used to pressurize the fuel within the fuel injector for proper atomization and direct injection into the cylinders
6.0L Facts Slide5
Fuel injector "spool valve" is trying to move back and forth inside the injector
In a 6.0L this is achieved with two 48v coils on each end of the spool valve while trying to overcome anywhere from 500-4000 psi oil pressures being generated Spool valve bore needs to be contaminate free and unrestricted for proper fuel injector operation
Carbon contaminates, Varnish build up, or Wear will cause the spool valve to stick,
especially when the oil is cold & thicker and isn't flowing as easily, even with thinner grade oils In Summary…Slide6
Fuel Management System
There are injector stiction issues on Ford 6.0L & 7.3L
PowerStrokes with the HEUI fuel injection system.
(Hydraulic Electronic Unit Injection)
Slide7
What is HEUI fuel injection?
An engine oil pressurized fuel injection system
Uses crankcase motor oil to pressurize the fuel inside the fuel injector via a separate high-pressure oil pump within the engine. High-pressure
oil pump puts out anywhere from 500-4000psi oil pressure
Very hard on any motor oil, synthetic or conventional QuestionsSlide8
What are the symptoms of fuel injector stiction
? Romping
uneven engine idle Hard starting & Cylinder misfiring Unable
to accelerate until the engine warms
up Loss of performance means lower MPG QuestionsSlide9
What causes fuel injector
stiction?An inability for the
high-pressurized motor oil to flow correctly through the fuel injector"stiction" comes from sticking spool valves inside the fuel injector’s high-pressure oil circuitry
The
spool valve allows oil pressure in and out of the fuel injectorIt is controlled by two 48v coils inside the injector and moves side to side back and forth. When
ON, it allows oil pressure to push the fuel into the cylinders.
When
OFF, it bypasses the oil back to the crankcase.
QuestionsSlide10
What causes these spool valves to stick?
Worn spool valves and or engine oil contaminates within the spool valve bore or orifice and varnish build up
Spool valve only moves 0.43mm in a 6.0L PowerStroke Less than a half a millimeter for high-pressurizedmotor oil to flow
QuestionsSlide11
What can be done about the spool valves sticking?
Add Archoil AR9100 into your motor oil
-This will liquefy all deposits in the fluid systemfree up contaminated injector spool valves-Injector stiction symptoms completely disappear, even at -
20F
-Normally happens shortly after application-If spool valves are severely worn or injectors have worn fuel delivery pintles or nozzles, it usually indicates injector needs replacingAR9100 has a high 90%+ success rate, but it also does much more.
AnswerSlide12
For more information go to
Archoil.com
Contributing TechnicianHarry JohnsonMercedes Benz USA master certified diagnostic technician
ASE master and L1 certified advanced engine performance specialist
WA State certified diesel emission specialist