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Old 08-15-2007, 04:44 PM
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engine dying out

I've got a 2000 7.3L at the shop that is driving me nuts. It seemed like a classic cps problem but turns out its something else. Engine starts but dies unexpectantly. No tach movement or oil pressure guage movement when cranking. Oil p ressure comes up on mechanical guage but not on dash. No codes coming up on scanner, 6 logged, but for some reason the scanner can't pick them up. Peeled back engine wiring harness, tested cps wires and all seem ok. Kind of wondering if maybe the dash guage panel guages are faulty, has anyone seen this happen, and will a faulty panel cause the engine not to run, also wondering if a faulty idm cause these symptoms. At this point all ideas are welcome. Battery voltage and fluids are all good.
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Old 08-15-2007, 04:48 PM
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Might be a fuel issue. When is the last time you changed your fuel filter? Maybe put a gauge on and check fuel pressure.
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Old 08-15-2007, 04:55 PM
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Try this web site,Intellidog.com and click on the dieselmann banner.(has helped me out many times)
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Old 08-15-2007, 05:01 PM
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what are you trying to use to pull codes?? What do you mean 6 codes flagged but none registering??

What pressure does the mechanical gauge read when the dash one says 0??
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Old 08-15-2007, 05:20 PM
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I'm using a MAC scanner, engine psi goes up to 15-20 psi with nothing registering on dash guage. Show 6 logged codes but won't let me get into them, maybe scanner has an issue, I don't know but never had a problem with it until now.
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Old 08-15-2007, 05:23 PM
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20PSI cold is way too low...

see if you can get a hold of a different scanner to see what codes its flagging...could be an IPR issue...wiring....etc...

Also..check the high pressure oil resevour and see if its full (should be within one inch of the top)
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Old 08-15-2007, 05:28 PM
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The tach should be registering while cranking though, shouldn't it? That is what made me think it's a cps, or wiring in the first place. Base oil pressure shouldn't effect the tach/cps signal, or would it?
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Old 08-15-2007, 05:33 PM
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Quote:
Originally Posted by grabowskimech View Post
The tach should be registering while cranking though, shouldn't it? That is what made me think it's a cps, or wiring in the first place. Base oil pressure shouldn't effect the tach/cps signal, or would it?
The first thing you should do is check your glow plug light...if it doesnt come on at all....99% chance its the PCM itself...

Since you have multiple gauge issues...i would definately think its a module or wiering issue....check the bulkhead connector over drivers valve cover on the body side of the harness to see if it has rubbed any wires bare....
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Old 08-15-2007, 05:42 PM
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Glow plug light comes on fine, and I did check the bulkhead connector and checked the wires all the way to cps, continuity ok, but I wonder if the wire is ok...maybe just holding on by a strand inside. By module, do you mean idm? Thanks for the help Marc.
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Old 08-15-2007, 05:45 PM
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Quote:
Originally Posted by grabowskimech View Post
Glow plug light comes on fine, and I did check the bulkhead connector and checked the wires all the way to cps, continuity ok, but I wonder if the wire is ok...maybe just holding on by a strand inside. By module, do you mean idm? Thanks for the help Marc.
could be IDM or PCM related...as well as the cluster....

did you physically look at the wires by the bulkead connector. No tach signal means it pretty much should be CPS...wiring...cluster...or PCM related... Where your having issues with the oil pressure gauge as well...that to me should narrow it down to looking at the cluster or wiring...

Stupid question i know...but you have checked all your fuses right??
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