Loss of Horsepower - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 10-28-2010, 04:07 PM Thread Starter
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Unhappy Loss of Horsepower

I hope this isn't too vague, but I just got my '99 7.3L emission inspected and the dyno indicated the power was about half of what it should have been (somewhere around 100 vs. 200). I have noticed slower acceleration, a little rougher idle, and I very recently noticed a smell of fuel outside of the cab. It is throwing no service codes. So where do I begin? Injectors? Any help would be appreciated.
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post #2 of 8 Old 10-28-2010, 04:14 PM
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The Basics - When is the last time you changed your fuel and/or air filter?

Do you notice any fuel dripping on the ground near the passenger front side of the engine? I had the fuel smell too. I replaced the fuel bowl drain valve. (I found out later, I could have got just the O-rings - much cheaper). That fixed the fuel smell....for me anyway.


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post #3 of 8 Old 10-28-2010, 05:22 PM
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I have this same problem in my 2001 X .... this past summer it was running great and pulling the boat everywhere, now it is soooo sluggish I wouldn't even bother hooking up. I just changed the oil, did the fuel & air filters recently as well. My only crime is not changing the oil until 5000 miles, I won't be making that mistake again. It has an Edge ezf1000 on it, do they go bad? Do I just unplug it to return to stock program?
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post #4 of 8 Old 11-11-2010, 05:10 PM
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if you are smelling fuel, check for fuel leaks. as mentioned replace your fuel filter and check your air filter.
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post #5 of 8 Old 11-12-2010, 11:10 AM
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I have no fuel leaks, fresh fuel filter & air filter, and new oil & filter. This one has me stumped because of no dtc's and what I would call a slow decline in performance, no "event" to consider as a cause.....
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post #6 of 8 Old 11-12-2010, 11:17 AM
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maybe you just cant find the leak?
just a guess but cant turbo pedestal leak give you a fuel smell?
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post #7 of 8 Old 11-12-2010, 03:07 PM
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how does the fuel look? Ford has a TSB about fuel gelling up with certain types of diesel fuels which would cause all the above symptoms. dunno if thats your problem but just though I would mention it. How does your oil look? Is it high on the dipstick? Diluted? That would be signs of injectors leaking.
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post #8 of 8 Old 11-19-2010, 09:53 AM
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Update: I pulled the nearly new fuel filter and it was PACKED with something black! Must've picked up some sketchy fuel somewhere along the way... feeling kinda sheepish because I always check the basics - fuel, oil, & air filters, batteries, etc. before posting but since they were all nearly new I didn't. My bad.
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