Odd Behavior with my 1997 7.3 PS - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 4 (permalink) Old 04-18-2019, 02:30 AM Thread Starter
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Odd Behavior with my 1997 7.3 PS

Hi everyone. I was hoping for some advice on my 1997 7.3 Powerstroke. I am the original owner. Mileage is 150K. Standard trans. regularly maintained. The only Mod is the EBP valve actuator linkage was disconnected years ago and the valve wired open. (I had cold weather drivability issues) Since then I learned that Ford in 97 had, in their infinite wisdom to put a 198 deg thermostat in this year instead of the 203 deg one IH had put in previous years. I swapped this out for the 203 years ago and this definitely made the truck run better.
The truck starts easily cold or warm. Idles and runs smoothly. revs up smoothly without a load, or with one. As of late when pulling hills or accelerating hard, I get a lot of black smoke from the exhaust and power is marginal.
My local dealer tells me I may have a bad injector, but everything I have read about this issue, always has rough idle/starting issues. I have just replaced the intake tubes downstream from the turbo. I checked the turbo while I had things apart. No play in the shaft and the vanes were not damaged. No change in the issue. I have also read the the screen in the fuel return line on the filter housing can become plugged. The symptoms for this do not seem to match my issue either. Any guesses what the issue could be?
I have experienced in the past,
The leaking oil galley plug seal.
The injector/ glow plug wiring meltdown
IDM replacement
Lift pump replacement

Thank you all in advance for any advice!
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post #2 of 4 (permalink) Old 04-20-2019, 02:34 PM Thread Starter
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Re: Odd Behavior with my 1997 7.3 PS

I forgot to add the up pipes were replaced recently.
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post #3 of 4 (permalink) Old 04-20-2019, 02:54 PM
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Re: Odd Behavior with my 1997 7.3 PS

Pre turbo exhaust leaks, plugged air filter, what's your hpop pressure, and IPR %

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post #4 of 4 (permalink) Old 05-03-2019, 01:40 AM Thread Starter
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Re: Odd Behavior with my 1997 7.3 PS

Thank you for the reply heavydoc!
I have been offline for a bit.
I had the up pipes replaced about a year ago. The intake tubes were replaced a month ago. I have not had the HPOP checked as the symptoms of this issue did not match, what I am experiencing. The air filter was replaced 5 moths ago and probably has less than 400 miles on it. The truck is not a daily driver as it is mostly delegated to snow plow duty, ( my own driveway, not commercially). Occasionally I drive it to work about 60 miles round trip. I pulled the fuel filter this afternoon and replaced it. It didn't look bad, I have seen it worse. While I had it apart I checked the FPR fuel pressure return screen, and it looks like it may be partially clogged. I will get to this on the weekend, and see if it helps. If not I will have the local Ford dealer check the HPOP. Is an IPR the same as an FPR? I am not familiar with that acronym. Thank you for your insight! Anybody else venture a guess?
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