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7.3 Tech
Need ideas.. No start
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[QUOTE="golfer, post: 1014573, member: 266"] if you have a DVOM/voltmeter, you can monitor ICP voltage while cranking... if you have LPOP (on dash gauge)...and are not making any/significant HPOPressure...then it's either pump, IPR or a leak in the HPOil system...including injs, inj o-rings, inj poppet valves, and the 2 plugs under the VC's (bottom side of HPOil rail)...or the gear simply isn't turning the pump shaft. any leak in the HPOil system will have the exact same result...no/insufficient ICP pressure. most SRP's we've seen fail allow metal (internal springs from the pump defect/failure) work their way into the injector poppet valves... so don't rule out injectors. if you had poppet valves hung open from pump debris...the HPOil rail would gravity bleed down (through the injs) back to the pan. IF you've confirmed a lack of ICP pressure...then you can crank with injs disconnected electrically...to see/visually where the oil is going. ICP voltage/pressure relationship is approximately 1.0v = 750psi...so you'll need about 0.65vdc while cranking to even fire the injs/mechanically. as a side note...unplugging the ICP sensor does NOT give you mechancial pressure, LOL...it simply defaults the PCM value for ICP. leave the sensor/wiring hooked up...and monitor ICP while cranking. The ICP sensor, will have a 3 wire harness that plugs into it. To check the voltage (ICP “pressure”), you will need to leave the harness plugged INTO the sensor, and probe the appropriate wire with your voltmeter lead (other lead to a ground point on engine, or neg. battery terminal). Of the 3 wires, one wire is going to have a constant ~ 4-5.0vdc reading (with the key on, engine off), one wire will be ‘ground’ (check continuity to other grounds)…and the last wire (the one you want to check) will have a variable voltage which varies linearly with pressure [/QUOTE]
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