2The Documented Problem 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.
3The 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
46.0L Facts Contains extreme high-pressure engine oil system High-pressured oil pump is used - HPOPPump used to pressurize the fuel within the fuel injector for proper atomization and direct injection into the cylinders
5In Summary…Fuel injector "spool valve" is trying to move back and forth inside the injectorIn a 6.0L this is achieved with two 48v coils on each end of the spool valve while trying to overcome anywhere from psi oil pressures being generatedSpool valve bore needs to be contaminate free and unrestricted for proper fuel injector operationCarbon 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
6Fuel Management System There are injector stiction issues on Ford 6.0L & 7.3L PowerStrokes with the HEUI fuel injection system.(Hydraulic Electronic Unit Injection)
7What is HEUI fuel injection? QuestionsWhat is HEUI fuel injection?An engine oil pressurized fuel injection systemUses 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 psi oil pressure Very hard on any motor oil, synthetic or conventional
8Questions What are the symptoms of fuel injector stiction? Romping uneven engine idleHard starting & Cylinder misfiringUnable to accelerate until the engine warms upLoss of performance means lower MPG
9What causes fuel injector stiction? QuestionsWhat 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 circuitryThe 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.
10Questions 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 upSpool valve only moves 0.43mm in a 6.0L PowerStrokeLess than a half a millimeter for high-pressurizedmotor oil to flow
11Answer 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.
12For more information go to Archoil.com Contributing TechnicianHarry JohnsonMercedes Benz USA master certified diagnostic technicianASE master and L1 certified advanced engine performance specialistWA State certified diesel emission specialistFor more information go to Archoil.com