Join Date: Apr 1999
Location: Justin,Texas, Republic of TEXAS (USA)
Feedback Score: 0 reviews
ICP sensor is not mentioned as having been changed on any of these. Wire faults at ICP or a faulty ICP could do this as the sensor or wiring faults to sensor may fail to give the threshold oil pressure reading for injectors to be operated. If you tow a vehicle and you get the engine to say 400 rpm you will make a lot more HP oil pressure and if the sensor is offset 250 psi the pressure would go over the threshold and you'd get it to run.
With an incorrect reading from ICP, by incorrect I'm referring to having 500 psi but the signal reaching ECM is 250psi, the starting cranking spped won't get you enough oil pressure to get to threshold for injector operation.
In addition to bad sensor, a problem with some other sensor or even with the ECM could give low Vref (the 5 volts that feeds to sensors that they in turn modify and is reduced to the value for the sensor monitored pressure, temp, speed, etc.) in sensor circuit and cause erroneous ICP signal and no starting while cranking over.
It sounds like the dealer is doing things to chase this very issue without resorting to throwing parts at it. One no start with scanner on it would probably get it pinpointed but it seems that it has started for them when they had it for diagnosis.
Don't tell my cattle I got leather seats!
2006 F450 CC Hauler bed 4x2 6.0 L Pstroke/Torqshift, Lariat, 4.30 r/a, SCT, 4in exhaust. 103K New heads to repair diesel in coolant.
2006 F350 Lariat CC Dually 4X2, 6.0 TorqShift 4.10 LS, SCT, airbags, 4 in. exhaust. 147K Rebuilt engine to repair damage from burned piston. One head to fix fuel in oil problem.
36 feet on the floor Elite/Outlaw LQ horse trailer.
36 foot double tandem axle flatbed trailer.
36 foot Sooner 6 horse large dressing/ mid tack.
2003 EB Expedition 149K (no engine repairs, gas burners are the new longevity leaders)
2004 Volvo V70R AWD-high miler in fleet, 228K (no engine repairs)
2007 BMW 550i 6MT 130K
Last edited by jimmy; 07-13-2010 at 11:05 AM.