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Tractor Talk Discussion Forum

97 F350 Powerstroke No Power

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John H in MD

01-15-2008 01:35:45




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I've got a 97 7.3 Powerstroke that I've owned since new. It used to get decent mileage and pull pretty good, now it seems like the turbo never kicks in and it won't pull a hill with a load behind it. The mileage has dropped to around 12mpg, has new fuel filter, new air filter, none of the lights on dash are on. This is a stock F350 4x4 5 speed with 355 rear with 55000 miles on it, is the fuel that bad or is there something I'm missing.

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T_Bone

01-15-2008 17:44:08




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
Hi John,

On any puter controlled engine with a glitch the first thing to do is reset the puter, (disconnect both battery's over night)

This resets the puter to the factory defaults and clears all codes execpt one, a disconnected battery code.

If the engine truely has a problem it will shortly set new codes.

I reset my 02PSD puter at every 5k oil change and my life time 27k mile fuel mileage is ***15.2mpg*** that includes pulling 16kGCW to 31kGCW for 9k miles.

T_Bone

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Haywood

01-15-2008 13:19:15




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
Check your fuel transfer pump pressure and see if you have the specified value. About 35psi minimum on early production and 60+ psi or so on later engines with Dead head fuel system. (Dead head is no fuel return lines at rear of heads back to lift transfer pump).

Also Check for holes in Air to Air Cooler piping.



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J.C.in AZ.

01-15-2008 11:01:32




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
New Converter may make your truck like new again,it did mine.



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skyharborcowboy

01-15-2008 08:17:20




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
www.thedieselstop.com can answer your question. The best Ford Diesel site there is. Anyone that has a Ford diesel should be a member!

Joe



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guido

01-15-2008 07:27:32




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
Hey John
If it starts o.k. your fuel system/injectors etc. should be fine. At 50.000 you should have changed the air filter. You can get a can of fuel conditioner it may help. Remember the new fuel ULSD has about 3% less energy than the old LSD.
Check your air intake restriction gauge, it should not be in the red zone check your intake for restrictions or kinks.
Guido.



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JT

01-15-2008 06:22:57




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
I agree with comfortking, it sounds as though you may have a plugged catalytic converter. Does it smoke real bad or anything else strange that you might hear or see? If the MIL light does not come on, it sounds to be mechanical and not a computor problem.
Jim



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John H in MD

01-15-2008 06:39:08




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 Re: 97 F350 Powerstroke No Power in reply to JT, 01-15-2008 06:22:57  
No smoke or dash lights. Just loss of power under load. Still runs good empty, just no turbo and bad mileage.



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Sean McDonnell

01-15-2008 05:39:06




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
I have a 2001 7.3 that had similar problems. My mileage went south and Ford couldn't find anything wrong. In my case it turned out to be a fuel pressure issue. Not sure if the 97's have the exact same setup or not but on mine there is a fuel fitting on the pickup line at the top of the tank that has o-rings in it. I had a crack in one o-ring and the pump was sucking air. there should be a test port on the fuel system at the engine(mine is on the back of the filter canister) where you can check your fuel pressure. Make sure it's stable, mine was bouncing all over the place due to the air bubbles in the system.

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Paul Shuler

01-15-2008 04:37:34




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
This may not be your problem at all. Have a friend that had the same truck and suddenly had the same problems. Took it back to Ford on many occasions and they couldn't find anything. The day he sold the truck a mechanic showed him what was wrong with it. He had installed a aftermarket bug shield on it and with the hood down and at high demand for air it was not allowing good air flow to the engine. At the dealership they would lift the hood and put it on a machine and it would perform just fine. Just a thought.
Paul

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John M

01-15-2008 03:09:34




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
EBPV stuck closed, or your turbo is headed south.



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John H in MD

01-15-2008 04:30:27




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 Re: 97 F350 Powerstroke No Power in reply to John M, 01-15-2008 03:09:34  
Are you talking about the electrnic dump valve?



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John M

01-15-2008 13:52:05




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 04:30:27  
The exaust back pressure valve closes some when theengine is cold to allow it to heat up faster. They have beeen known to stick closed causing the exact problem your having.



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Big Hunter

01-15-2008 02:06:18




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 01:35:45  
I don't have an answer for you, I'm having the same problem....kinda...I have a 99, bought it new, ran great for 160,000 miles then like a light switch I went from 16 to 17mpg to 11 to 12mpg, most of the time it runs like it is bogging out then at random it will pick up and go like it used to just for about 15 to 30 seconds then bog back out, no codes...I wish I could find a mechanic that could diagnois the ding dang thing when they can't use a computer to tell them whats wrong. I love my truck but this is getting old...being going on like this for awhile now

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comfortking

01-15-2008 02:59:33




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 Re: 97 F350 Powerstroke No Power in reply to Big Hunter, 01-15-2008 02:06:18  
Unplug the map. sensor and see if it changes anything. The next step is to unhook the exhaust at the end of the down pipe and see if you have a change in power. I would think your converter is plugged.



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John H in MD

01-15-2008 06:42:18




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 Re: 97 F350 Powerstroke No Power in reply to comfortking, 01-15-2008 02:59:33  
I've been thinking of putting 4" exhaust on but I don't want to through more money into it if it's something else.



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James S.

02-02-2008 15:38:54




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 Re: 97 F350 Powerstroke No Power in reply to John H in MD, 01-15-2008 06:42:18  
John H. I have an answer for you. I also have a 97 powerstroke that had this same problem.. for most of this past fall, and I was able to find the solution not too long ago. Next to the filter housing (towards the drivers side) is the fuel regulator. You need a 10mm socket, and remove the 2 bolts that hold it on. (make sure you put them back in the same holes, since they are different lengths) Pull the regulator from the filter housing, but do it carefully so you do not drop the O Ring that is inside there. You will find a screen on the regulator, and I bet that it is clogged up somewhat. It is only a 10 min. fix, and made my truck feel like it was brand new! Now I do this on a regular basis, along with a new filter and spraying out the filter housing really well, about every time I change the oil.
I hope this helps.

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