no torque psd
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Senior User
Joined: Mar 2004
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From: whitney
no torque psd
i have a 99 f250 4x4 powerstroke with a 4r100 auto. & I tow occaisionally
but not real often, but when I tow my 16 foot bumper pull it's a chore. This
truck runs, starts, gets good mileage but you hook up a trailer it's just a
dog, it feels like it has to work real hard to keep its speed. & when you hit
a hill if you can hit it at 70 (it generally won't tho) it will be at about 45-50
when it tops the hill. & actually it doesn't do that good without a load.
It will run 70, but the damn thing will have to spool way up like 8-10 lbs
maybe & it feels like thats all its got. I know diesels make their tq down low
but, gosh darn my last chevy 350 could climb hills a lot better & in od. It does great down real low like under about 45 then it has no power. Any
body know, tell me, thanks.
but not real often, but when I tow my 16 foot bumper pull it's a chore. This
truck runs, starts, gets good mileage but you hook up a trailer it's just a
dog, it feels like it has to work real hard to keep its speed. & when you hit
a hill if you can hit it at 70 (it generally won't tho) it will be at about 45-50
when it tops the hill. & actually it doesn't do that good without a load.
It will run 70, but the damn thing will have to spool way up like 8-10 lbs
maybe & it feels like thats all its got. I know diesels make their tq down low
but, gosh darn my last chevy 350 could climb hills a lot better & in od. It does great down real low like under about 45 then it has no power. Any
body know, tell me, thanks.
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From: whitney
im not sure but its plenty fresh (fuel filter). I really dont think its the fuel pump, b/c its
done this for awile & it wouldve kicked the bucket by now, & it starts fine. But I can't
sware to it, I think im just goin to take it to the dealer & let them mess around with it.
done this for awile & it wouldve kicked the bucket by now, & it starts fine. But I can't
sware to it, I think im just goin to take it to the dealer & let them mess around with it.
Fleet Mechanic
Joined: Feb 2004
Posts: 1,816
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From: River Valley AR
I don't know if the 99's have it or not but there is an EBPV (exhaust back pressure valve) on the outlet of your turbo going to the downpipe. It's basically a butterfly valve that's in the exhaust. It's supposed to help warm-up the engine but if it's closed while running you will definitely lose power. Many people remove them and gut them, some rig them to stay open all the time, and others use a modification that uses the EBPV as a jake brake.
If you're pulling off of the bumper I'll assume that you're not pulling an excessive amount of weight. My 97 just pulled 10K and stayed in OD most of the time for 300 miles. My truck is bone stock and has a 3.55 gear. Your truck should be able to do that as well or better.
If you're pulling off of the bumper I'll assume that you're not pulling an excessive amount of weight. My 97 just pulled 10K and stayed in OD most of the time for 300 miles. My truck is bone stock and has a 3.55 gear. Your truck should be able to do that as well or better.
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From: whitney
s*it, I was pulling it empty! Pretty pathetic really. I did think about that just haven't
had the time to mess with it. I kinda think its screwy tho, because momentairly when
it's not even cold at all, like this past summer actually. But sometimes in the summer
you could hear it close accompanied by a lack of power then it would open & the truck
would start scooting right along.
had the time to mess with it. I kinda think its screwy tho, because momentairly when
it's not even cold at all, like this past summer actually. But sometimes in the summer
you could hear it close accompanied by a lack of power then it would open & the truck
would start scooting right along.
Posting Guru
Joined: Aug 2004
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From: Braham MN
Do you have any gauges??? If so tell us more. Were the EGT's higher then normal, was boost a little low for norm???
Diesel rod
Diesel rod
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Joined: Nov 2003
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From: Chugiak, Alaska
Yup, you gotta problem. I have the same turck, with 105k miles. I tow regularly with a camper on the truck. GWCW ia a tad over 19,000#. I don't have problems even on long grades. Just have to bakc out of it when the temps start to climb. I don't have a mod other than the AIS filter repalcement.
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Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
With those high boost numbers just to maintain speed I strongly suspect restricted exhaust. Stuck EBPV, plugged muffler, clogged cat if you have one. When I tow I tip the scales at 23,000 gross for the truck and trailer combined. I only have to shift down once to maintain 50 mph on a 6-7% grade. No power mods, stock sized exhaust.
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Joined: Mar 2003
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From: AZ.
I had the same problem the last time I towed the trailer. The small screen in the filter housing was full of black crud but I don't know if that would cause the problem . I haven't towed since I cleaned it out. The filter had a couple thousand miles on it. The The exhaust valve is open. It's a '97 F-350, stock with only 57000 miles. I passed the last emmission test in Dec. @ 1 % ..With such low miles I wouldn't think the Cat would be plugged but is there any way to check it? ......................Thanks
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From: whitney
yeah i got gauges & i failed to mention I have a shift kit (bully dog), a big intake from
napa 8.50'' OD x 11.00'' long (big cylinder type filter), & a sp stage 1 module. But back
to gauge #'s, the pyro would show about 600-700 sometimes 750 (on flat level ground)
but when i hit a hill the pyro would run about 750-1000, & at 8 lbs generally. How do
you disable the butterfly valve? & if you do will it stay open? & i dont have a cat btw.
Thanks
napa 8.50'' OD x 11.00'' long (big cylinder type filter), & a sp stage 1 module. But back
to gauge #'s, the pyro would show about 600-700 sometimes 750 (on flat level ground)
but when i hit a hill the pyro would run about 750-1000, & at 8 lbs generally. How do
you disable the butterfly valve? & if you do will it stay open? & i dont have a cat btw.
Thanks
Senior User
Joined: Apr 2004
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From: Roaring Branch, PA
Originally Posted by Jerrybo66
I wouldn't think the Cat would be plugged but is there any way to check it?
2) warm the engine to operating temp., put the tranny in park and apply the brake.
3) note and record the the vac. reading at idle.
4) quickly open the throttle to near full throttle and release it shut. Note and record the reading.
5) perform the test three more times, record the reading after each reading.
6) if the reading after the fourth test is more than one in-Hg lower than the reading recorded at idle, the exhaust system may be restricted (the cat could be plugged or an exhaust pipe or muffler could be restricted).
or
1) remove catalytic converter.
2) set catalytic converter on ground away from truck.
3) beat catalytic converter repeatedly with 20 lb. sledge hammer. (optional)
4) put a straight piece of pipe in place of where catalytic converter once was.
hope this helps!
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
That's a gas engine procedure there Ricky. Diesels don't have any vacuum in thier intake. Best way to test it on a PSD is to disconnect the exhaust at the downpipe outlet and go test drive. It's not that loud, the turbo itself is a great muffler.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by dieselstroke
what about disabling the ebpv, how do i do that? I've heard the wire connector
disconnect but some say it will lead to oil leaking
disconnect but some say it will lead to oil leaking
https://www.ford-trucks.com/user_gal...=57001&width=2