Oil Question.......
Thread Starter
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Freshman User
Joined: Jan 2014
Posts: 47
Likes: 0
From: Fallon, Nevada
Oil Question.......
Here's the deal... After changing the oil on a 95 7.3 PSD it now won't start. It did run for a couple of minutes, then died and hasn't ran since. My question is this. What type and brand do most of you PSD owners run? I've read it has to be a non foaming diesel rated oil, I get that, because of the Pressure form the
HPOP to injectors. We've tried everything to get it to run, all the numbers are good except the FPW, it reads .22 during cranking. Would foaming oil cause this? It seems to try to run for about 3 seconds then just cranks. It has a new CPS, IRP, ICP, and 4 new drivers side glow plugs.I am, regrettably, not a diesel savvy mechanic, but am learning a lot from all the input from all of you members. Really appreciate it!!!
HPOP to injectors. We've tried everything to get it to run, all the numbers are good except the FPW, it reads .22 during cranking. Would foaming oil cause this? It seems to try to run for about 3 seconds then just cranks. It has a new CPS, IRP, ICP, and 4 new drivers side glow plugs.I am, regrettably, not a diesel savvy mechanic, but am learning a lot from all the input from all of you members. Really appreciate it!!!
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
I use Ford Motorcraft for Power Strokes @ Walmart, cost effective thing. I doubt if it's the oil though but curious what brand you put in. Also it takes 14 quarts with new oil filter, but I'm sure you knew that.
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
Ford Motorcraft...that is a FORD brand...sold at Walmart...just like your rotella 15-40, which is a SHELL product sold at Walmart.
I'm perplexed how changing oil would ever cause a no start but am interested to see what you find...
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
If the truck was running fine prior to this, then my only guess would be you have less than 8qts of oil in there... but that is not the case, so I'd look back to one of the parts you have replaced. A computer could have taking a shat, but unless it was soaked. I would not bet my pennies on it either. have you tried swapping IDMs? Batteries fully charged?
Just naming the simple things that may be overlooked that prevent your injectors to fire...
FPW? what is this? Fuel Pressure ?
Just naming the simple things that may be overlooked that prevent your injectors to fire...
FPW? what is this? Fuel Pressure ?
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Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
FPW = Fuel pulse width. Can't measure fuel pressure via the PCM, of course. Question is, what's the unit of measure? Seconds? Milliseconds? Percent?
Did you check the HPOP res level? Did you happen to monitor injection pressure while cranking?
Did you check the HPOP res level? Did you happen to monitor injection pressure while cranking?
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Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
FPW is injector pulse width measured in ms.
Below from this site ... Hard Start/No Start Diagnostic Procedures
No fuel command signal when ICP, RPM and VPWR signals are correct usually indicates a loss of CMP sync signal. Refer to Pinpoint Test G for CMP sensor diagnosis.
A 1 to 6 ms fuel pulse width will be sent by the PCM to the IDM when a sync pulse has been received from the CMP sensor and when sufficient injection control pressure is present. A 0.42 ms fuel pulse width (a no fueling pulse) will be sent by the PCM when a sync pulse has been received from the CMP sensor and if insufficient injection control pressure is present. This 0.42 ms fuel pulse width will not allow injectors to be enabled, but does keep the IDM and PCM synchronized until sufficient injection control pressure is realized.
RPM is determined by counting the 12 slots on the cam gear, and you have RPM. However, sync pulse are the 2 narrower pulses (slots) determining cylinder 1 and 4 position. As stated above ...
No fuel command signal when ICP, RPM and VPWR signals are correct usually indicates a loss of CMP sync signal ... and you are not generating enough pulse width to command fuel.
I'm thinking you have a bad CPS that's not detecting CMP sync so you might want to put the original back in or try another one.
Just a thought ...
Below from this site ... Hard Start/No Start Diagnostic Procedures
No fuel command signal when ICP, RPM and VPWR signals are correct usually indicates a loss of CMP sync signal. Refer to Pinpoint Test G for CMP sensor diagnosis.
A 1 to 6 ms fuel pulse width will be sent by the PCM to the IDM when a sync pulse has been received from the CMP sensor and when sufficient injection control pressure is present. A 0.42 ms fuel pulse width (a no fueling pulse) will be sent by the PCM when a sync pulse has been received from the CMP sensor and if insufficient injection control pressure is present. This 0.42 ms fuel pulse width will not allow injectors to be enabled, but does keep the IDM and PCM synchronized until sufficient injection control pressure is realized.
RPM is determined by counting the 12 slots on the cam gear, and you have RPM. However, sync pulse are the 2 narrower pulses (slots) determining cylinder 1 and 4 position. As stated above ...
No fuel command signal when ICP, RPM and VPWR signals are correct usually indicates a loss of CMP sync signal ... and you are not generating enough pulse width to command fuel.
I'm thinking you have a bad CPS that's not detecting CMP sync so you might want to put the original back in or try another one.
Just a thought ...
Thread Starter
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Freshman User
Joined: Jan 2014
Posts: 47
Likes: 0
From: Fallon, Nevada
Thanks, I've tried 2 of em, (cps), both black in color, both new from NAPA. I am wondering if I got it seated correctly. I noticed when cold it didn't want to go in very easy. I mean using the bolt to tighten it into the hole seems like the only way to install it given where it is, (access), any suggestions on another method of installing it? , I'll try the pinpoint test as suggested.Will the AE scanner work for this test?will it monitor injector pressure as well? HPOP res is staying full, hane checked it many times, both before cranking and after.thanks guys, this is just what I need, more input !!!
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
any suggestions on another method of installing it?
Will the AE scanner work for this test?will it monitor injector pressure as well?