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Power Strokes
6.0 Tech
Trouble-Shooting a No start condition
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[QUOTE="RescueF250, post: 1153, member: 170"] Hard start - no start conditions related to the HPOP could be attributed to the following components in the high pressure oil system (air test while hot will determine the root cause): Weak HPOP? - Ford Truck Fanatics Faulty IPR valve Leaking snap-to-connect (STC) fitting (05 and up model years) Leaky or cracked branch tube Leak with the stand pipe Leaky or cracked oil rail (including oil rail end caps/plugs) Leak in the d-rings of the oil rail front port plugs (or dummy plugs) Leaky o-ring on an injector; or leak at the top of the injector where the ball tube from the high pressure oil rail connects to the injector. Weak or failed HPOP itself Low base oil pressure (failed oil pressure regulator). Low base oil pressure (bad low pressure oil pump - LPOP). TROUBLESHOOT THE HPO PRESSURE SYSTEM: (link broken - will try to track down the new URL) Determinimg if the ICP sensor is seeing 500 psig minimum: 2006 6.0L w/ 35K miles will not start ... - Ford Truck Enthusiasts Forums If possible, you can pull the ICP and install a pressure gauge to check the pressure in the “high pressure oil system”. Crank the engine and watch the pressure. You need 500 psig to start. The fitting needed for this is the same as that for the fuel pressure test port. Here is a way of checking to see if you have sufficient high pressure oil without having a gauge or adapter. Strip back the wires about an inch away from the icp sensor connector. Obtain a digital multimeter and set it for voltage (DC). The bn-wh wire is a five volt reference, leave that alone. Strip back the db-lg signal wire and the gy-rd ground wire. Put positive lead on a dark blue-light green wire and negative lead on gray-red wire. Have an assistant crank truck, you need a minimum of 0.80 volts (500 psi) for the truck to start, if you are getting greater than that then you have sufficient high pressure oil. Note - the orientation of the ICP wires are as follows: Reference orientation - harness connector clip on the bottom, with the connector facing away from you, and wires coming towards you. Top wire: db-lg Bottom left wire: bn-wh Bottom right wire: gy-rd Low pressure oil test procedure. Using a suitable adapter (such as Aeroquip® 2022-4-4S), install it in the engine oil pressure sensor hole to carry out the base oil pressure test. Install gauge to check the base oil pressure. The minimum engine oil pressure specifications are 82.7 kPa (12 psi) at 700 rpm, 165.5 kPa (24 psi) at 1,200 rpm and 310.3 kPa (45 psi) at 1,800 rpm with the engine at operating temperature. [/QUOTE]
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