1994.5 - 1997 7.3L Power Stroke Diesel  

95 7.3 still no start

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  #16  
Old 01-02-2014, 12:44 PM
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You'll def. need a different device if you want to do a buzz test. Choice is based on what "format" you want:
* Plug-in scanner - Snap-On MT2500 or Solus (or is it Modis?)
* Dash/Pillar gauge, permanent install - AeroForce Interceptor
* Laptop/netbook + software (can log/save data) - AutoEnginuity

I bought AE a couple years ago and am pretty happy with it. 'Bout six months ago, Kim Komando declared netbooks "dead", so I started shopping. You can get 'em on CL for <$100, and it's all you need for AE. Small enough to slide under the seat or carry from truck to truck, and fits on the seat way better than a laptop. Local dude just CL'ed one for $70; hope he calls back....

Did you ever put the original ICP back in? Did you actually try starting it with the ICP unplugged? Was there any oil in the ICP electrical connector?
 
  #17  
Old 01-02-2014, 12:56 PM
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Dan, I did change the CPA first thing, no difference.
 
  #18  
Old 01-02-2014, 01:05 PM
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Yep, put the cleaned icp back in, that's when I got the numbers on the scangage . So the AE is the one you use. I've read some about it, seems lots of folks agree with you on it. Is is costly? Also, I don't really need to do a buzz test, I can hear the injectors making a clattering/tappet noise, so I figure they are working. After all the research I've done, I am leaning towards the PCM or the IDM now. Any input on that?
 
  #19  
Old 01-02-2014, 01:06 PM
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I didn't try to start it with the icp unplugged. What would that do?
 
  #20  
Old 01-02-2014, 02:15 PM
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Unplugging the ICP sends a "default" value (I've heard both the 750 PSI that you mention, and 500 PSI) to the PCM, which should at least allow the PCM to start the engine. To over-generalize a bit, if you have a no-start, and it starts with the ICP unplugged, it suggests the ICP is bad.
 
  #21  
Old 01-02-2014, 03:23 PM
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Actually it means that you more than likely have ipr problems. Unplugging the icp will sometimes "unstick" the ipr. The pcm reads the icp and tells the ipr what to do mainly based on the tps.

Here is a no start flow chart you can try and follow

no start flow chart
 
  #22  
Old 01-02-2014, 03:28 PM
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Thanks foreman, I'll check the flochart out and post the results, Kow
 
  #23  
Old 01-02-2014, 03:31 PM
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Well, I'll unplug it and see what happens. I'm kinda confused about high numbers after I unplugged the icp tho. Shouldn't I have gotten a much smaller number than 2300@? Like in the area of 750 -500?
 
  #24  
Old 01-02-2014, 04:34 PM
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Originally Posted by Kowdog
I'm kinda confused about high numbers after I unplugged the icp tho. Shouldn't I have gotten a much smaller number than 2300@? Like in the area of 750 -500?
Once again, that assumes that those XGauge program codes are relevant to the OBS PCM, and from the research I've done, they're not.

One of these days I should get an OBD-II connector splitter. It might be fun sometime to hook up my AE, then program my SGII with the published XGauge codes and hook it up at the same time, light 'er up and compare.
 
  #25  
Old 01-02-2014, 04:39 PM
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Go look in the oil drain pan for the Bypass valve , It may have fallen out

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  #26  
Old 01-02-2014, 10:12 PM
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Rick, you're talking about the bypass located at the oil filter? Are you thinking its gone and that would cause low pressure at the HPOP ,causing the injectors to not open?
 
  #27  
Old 01-03-2014, 12:03 AM
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If you have checked/ topped off oil in the hpop I would have to second the CPS. Quick and easy to change and it really is to badly priced.
 
  #28  
Old 01-03-2014, 09:18 AM
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Originally Posted by Action4478
Go look in the oil drain pan for the Bypass valve , It may have fallen out

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I was going to suggest this, but Rick beat me to it.
 
  #29  
Old 01-03-2014, 09:38 AM
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I am not sure
Why you guys are leaning toward the bypass. Let me start with an update as of yesterday evening. First the facts. Changed oil,engine ran for @ 5 minutes then died. Hasentstarted for @ 2 months. Oil is up to the full mark on dipstick, HPOP res full to top @plug on top. Tried new cps, actually tried two new cps sensers. Have a 2000 PSD w/7.3, so switched both the icp and ipr, no change. I also tried an old farmer trick of soaking a rag with gas and hanging it on the air filter intake. Truck would try to kinda run on the fumes, but not on diesel. Have some white smoke out the exhaust cranking engine. Bought a scan gage 2 thinking it would show me the numbers, but have been told it is giving me incorrect info. Have 50-60 psi fuel pressure at the schrader valve on fuel bowl. Thinking about it I am leaning towards electrical issues. Anyone have a harness check flochart? Or links to one? I appreciate all of you guys reply, nice to know folks are willing to help in a world full of BS.
 
  #30  
Old 01-03-2014, 09:46 AM
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Also, FYI ,replaced fuel pump with a new one at first right after replacing the cps for the first time. I am trying to keep from throwing more $ into parts to no avail. I am good with gas engines, new to this diesel. Frustating for sure. Have cranked this thing over so much, am worried about losing the starter soon.glow plug relay is working,drawing voltage. It DID try to start a couple times, just a sputter really. I'm going to run a fuel line directly from pump inlet to a 5 gl. Fuel can today to see if it is a restriction from the truck tank of switching valve.
 


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