Confused?
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Confused?
I'm trying to diagnose my 03 F250 6.0 for no start condition.
Truck died when driving back home 50 feet away from my driveway and won't start anymore. Currently waiting for SGII to have a whole picture, but meanwhile I tested FICM module and looks OK 48.4V KOEO and when cranking, fuel pump is working OK to. One thing is not clear to me when testing ICP sensor using DVM. Several posts states that voltage should be .25V with key ON and min. 0.8V when cranking. My readings are 1.32V with key ON and aprox 7.6V when cranking?????
Any explanation for that, what I'm doing wrong
Thanks in advance,
Darek
Truck died when driving back home 50 feet away from my driveway and won't start anymore. Currently waiting for SGII to have a whole picture, but meanwhile I tested FICM module and looks OK 48.4V KOEO and when cranking, fuel pump is working OK to. One thing is not clear to me when testing ICP sensor using DVM. Several posts states that voltage should be .25V with key ON and min. 0.8V when cranking. My readings are 1.32V with key ON and aprox 7.6V when cranking?????
Any explanation for that, what I'm doing wrong
Thanks in advance,
Darek
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Thanks for replays.
Think I'm doing this right. I stripped insulation from two wires going to the sensor and tapped my DVM right there. My Fluke DVM is st to DC Volts, range 1-30V.
What is not clear to me if sensor is bad higher voltage readings should make FICM "happier" thinking that oil pressure is high, unless is looking for specific range
Think I'm doing this right. I stripped insulation from two wires going to the sensor and tapped my DVM right there. My Fluke DVM is st to DC Volts, range 1-30V.
What is not clear to me if sensor is bad higher voltage readings should make FICM "happier" thinking that oil pressure is high, unless is looking for specific range
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Token Redneck
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From: Breckenridge, TX
But if it died while driving, it's probably worse than just a sensor. Pull the IPR valve and see if it's filter screen is cracked, if it's stuck in an open position then the truck won't build enough HPO pressure to start.
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Oops! my mistake. I was testing IPR thinking is a IPC. This truck is new to me and I'm not very familiar with. I used to turn wrenches for living but on foreign cars and I'm retired now.
Any way, I've spent few evenings lurking around this great forum educating myself about "6.0 No start Problems" and here it's what I've determined so far.
After finding ICP (behind IPR) and disconnecting it truck started, but run rough and felt like some cylinders are missing. After engine got warm, won't start anymore.
Replaced ICP.
Truck starts now. But same thing, only when cold and starts missing after idling for 10-15 seconds.
SG2 reports 800-1000 PSI when engine is cold but after gets warm and no start condition pressure is only 200-300 PSI when cranking.
Looks like I have HOP leak problem?
Did a air leak test from ICP port and I have lots of air coming from both valve covers, much less when IPR momentarily energized 12V.
Any suggestions where I should be looking next?
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Follow the hissing noises. There shouldn't be any with IPR energized. Dont keep IPR powered up more than a min or two at a time. It's a small consolation on your early engine there's no STC fitting on the high pressure oil pump to worry about, but the early pumps have a check ball in the HPOP housing that they will spit out sometimes.
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Sounds like air is coming out from under both valve covers in equal amounts, so my guess is that's coming from a crank case.
This morning I removed IPR valve, cleaned and put new seals on. After that engine started, and as usual after 15-20 seconds started running rough and missing. Five minutes later no more start.
Any other test I should do before pulling turbo out?????
This morning I removed IPR valve, cleaned and put new seals on. After that engine started, and as usual after 15-20 seconds started running rough and missing. Five minutes later no more start.
Any other test I should do before pulling turbo out?????
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Thanks for for your help guys.
Here are some PID's I've measured now. Engine is slightly warm right now and would not start. Today was about 82*F in my neighborhood and I've run engine this morning.
KOEO:
IPC 21 PSI
IPR 14.4 %
FMP 48.5V
Crank:
IPC 200-450 PSI
IPR 77%
FMP 48.0V
I'll post idle values tomorrow morning when engine starts
Here are some PID's I've measured now. Engine is slightly warm right now and would not start. Today was about 82*F in my neighborhood and I've run engine this morning.
KOEO:
IPC 21 PSI
IPR 14.4 %
FMP 48.5V
Crank:
IPC 200-450 PSI
IPR 77%
FMP 48.0V
I'll post idle values tomorrow morning when engine starts
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TommyH
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Jul 31, 2004 09:58 AM