1996 7.3L Losing power and running rough warm - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 5 (permalink) Old 11-16-2019, 10:31 PM Thread Starter
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1996 7.3L Losing power and running rough warm

Preliminaries: '96, 7.3L, Manual, 4x4, 240k, baby swamp injectors with ~40k, other than that it is stock.

Pickup starts/idles normally but with a bit more smoke than I'm used to. Once warm it starts to run real rough, loses power, smokes heavily with a blue tint and has a real acrid smell with no CEL present. My first indication was leaving work it seemed to hesitate a couple times when picking up the throttle (so brief I wasn't sure if I was imagining things or not) but other than that I didn't notice anything. Next morning I crawl in to go to work, starts normally but a couple miles into my commute the rough running and smoking badly started and I had to turn around to limp it home.

I've half convinced myself it's bad fuel and working from that angle but if not I need to know where to go and how to test so I don't start tossing gobs of money at all the possibilities.

I've done the dummy checks of making sure everything under the hood looks normal, no fried wires and connectors tight. From there??
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post #2 of 5 (permalink) Old 11-17-2019, 08:07 PM
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Re: 1996 7.3L Losing power and running rough warm

Could be a number of things, to help narrow down I’d plug it in for a few hours like 3 or 4, then fire it up to see if it runs rough right off the hop. If it does then I would replace the injection pressure regulator o-rings as a start. When it fires up fine cold then runs worse when at operating temps leads me to think it’s HP oil related. IRP o ring kit is inexpensive and relatively easy to change out. RiffRaff has them as does a number of other sites. When replacing these, ICP, IRP o rings, cam position sensor get the Fords OEM ones, aftermarket versions can give you grief.
j

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post #3 of 5 (permalink) Old 11-17-2019, 08:48 PM Thread Starter
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Re: 1996 7.3L Losing power and running rough warm

I replaced the injector regulator this spring, hope that's not giving me problems again.

ICP? Not figuring that acronym out.
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post #4 of 5 (permalink) Old 11-18-2019, 12:32 AM
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Re: 1996 7.3L Losing power and running rough warm

ICP = Injection Control Pressure Sensor. Front drivers head on the top just behind AC pump is where it can be found. The ICP senses HP oil in the HPO rail sends signal to PCM (power control module), which in turn monitors and controls the HP oil via the Injection Pressure Regulator.
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post #5 of 5 (permalink) Old 11-18-2019, 12:36 AM Thread Starter
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Re: 1996 7.3L Losing power and running rough warm

Ok, figured out what the ICP was and pulled the plug. Didn't change performance but there was oil in the unit so I changed sensor and plug to no effect.

Kind of changing gears here, I noticed after changing the ICP I do have some oil (got careless adding oil) on one of my exhaust ports that has not burned off and that is worrying. Pulled plugs on my gasket and getting 3.1-3.2 ohms an every injector. Bad or stuck injector?
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