Ford 7.3L Power Stroke (1999-2003) :: Truck Struggle Even On Flat Going 65 Mph And When It Comes To Hills It Really Slows Down
Aug 25, 2015
I have a 2001 F650 7 speed with 7.3l powerstroke and I am pulling a 15,000 pound fifth wheel. It is very new to me and just doesn't seem to have the pulling power. It seems to struggle even on flat going 65mph and when it comes to hills it really slows down. Should I be looking into power chips? If so, which one? Is there something else that may be preventing the full power?
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I pulled with my 2000 F250 7.3 for the first time yesterday pulling a 12,500 5th wheel and then again today with an 18 ft ski boat weighting around 3500 for both the trailer and boat. I had this same issue pulling both.
Today when pulling the boat/trailer i was behind a slow moving truck and when we hit a hill with a passing lane i merged over and wanted to start passing him. We started off at around 45 mph up the hill and as I started pushing the pedal I wasn't gaining any speed and my rpm's didn't even get over 1500. It felt like a stall and continued that at around 45-50 mph up the hill (about a 65 degree slope). When I'm not towing the truck runs great, plenty of power and averaging around 16 1/2 mpg.
Only mods i have is a 6647 Napa filter, muffler delete and it's running the same 4 position TS tuner from the original owner. During normal operation I run it at the 75hp gain and when towing i use the 50hp gain.
In both instances i could see black smoke coming from exhaust when pushing the pedal but my rpm's wouldn't go up and truck maintained the slow speed going up the hill. Once at the top it drove normal and picked up speed without any problems.
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Every time I hit a hill, loaded or empty, or get on the truck on level ground after about 15 seconds it acts like it's running out of fuel. The pump starts getting noisy like it has air in it, but it'll straighten out eventually. If you don't let off the fuel it'll eventually stall out. No check engine light, no codes. Truck has a ts chip but it does it on all settings. New fuel filter, changed oil with hot shots secret, new air filter, hutch mod done. I'm at a loss for what to do. Good fuel pressure also.
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I have a 2001 F350 Dually 7.3 w/260K miles. Hard starting, it has to be plugged in all the time. Occasionally/most of the time, blows white smoke at 50 to 60 mph or at high rpm. Replaced TPS and now runs totally different on starting, still hard to start but better throttle response on starting. Once started, I have to pedal it to keep it running, which seems to have little response as it would as if it was a direct throttle linkage attached to a carburetor...follow me? After a while, it will idle by itself. However, it still has flat spots when out of idle and at high rpm. Has gotten to the point that I can't trust to drive it.
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I have a little problem with my 1999 f250 7.3 power stroke diesel. Every once in awhile, while driving the truck would die completely but i switch it into neutral and started right up. What could be the problem?
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So I got a new tranny about a month ago. Everything works flawlessly. Until today.... Going up hills even small ones feels like I'm towing a house. No torque felling. In 3rd and 4th gear (automatic) it gains boost really fast and peaks at 28 lbs. and coasting downhill it slows itself down. I can go from 60 to 40 without braking in a half mile stretch. I fist noticed something was different when I started to drive home tonight; it makes a sort of whining or howling noise. I can't quite pinpoint where it's coming from. I'm tired of this truck but love it at the same time.
2003 125k miles New tranny New injectors New oil cooler and egr cooler Possible bad HPOP
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I have a 2003 7.3. Suddenly a week ago when I left work, I noticed my truck wasn't picking up much, but i was in a 40mph zone. I then jumped on the freeway and noticed the truck would not go over 60mph. Once I exited and got on another road with a 55mph speed limit, the truck would not go over 45mph, I had the pedal pressed all the way down and would not go over 2000 rpms. Also, for the transmission to shift, I would have to let off the accelerator.
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I have a e99 f350 7.3 all stock. I have no power. The truck will crank for about 15-20sec before it'll turn over. I just purchased the*AE*but am fairly new to understanding it all. In idle its a little rough and when I drive I can only stay in the neighborhood because of fear of getting rearended due to very slow acceleration. Whats weird is that when i have no power while i am driving ill keep the pedal down throw it in nuetral and my rpms and*icp*pressure jump up right away. Things I've replaced:
Icp*sensor
Fuel pump
Pcm
Tps
Cps
Ipr
Dropped tanked and cleaned screens
When cranking my*icp*pressure climbs slowly to right under 500. I dont know what else to do ive been working on this truck dor two months some days 13hs straight, I am feeling defeated. Codes p1249 1211 1209....
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2002 f250 7.3l diesel...
I got a new radiator and the tranny fluid was the worst the mechanic had ever seen. He serviced it and warned me that it might not be long for this world. I broke my flexplate and so I had to pull the tranny, and I decided to throw a new torque converter in because it was giving g me symptoms like a broken sprag( it wouldn't rev up or do a brake stand in gear, therefore slow takeoffs).
I was recommended to replace the tranny, I decided I could do the job again down the road if I needed to. About two thousand miles down the road I had a hard shift going from overdrive down to get up a hill and about 10 miles later the truck started slowing down....I couldn't give it enough pedal to keep it going and the engine sounded rough.
I pulled over and checked fluids and everything was fine, truck idled fine, bright red tranny fluid not burnt at all. Pulled on to the road again and it pulled fine until about 40 mph and it wouldn't go any faster. I got it towed home and ordered up a tranny from Ford figuring it must be toast, but I thought I'd throw it out to the forum to see if there is any other troubleshooting I can do before I install the new one in case it is some other problem or some electrical harness or something, or if that is a pretty standard reaction to a fried tranny.
Engine runs good at idle, shifts perfectly to drive and reverse, drives forward and back(I'm very hesitant to drive it out of the driveway in case I can't get it back in). Only happened two times before I decided to tow it. Temps looked fine on the gauges, fluid was a little overfilled in the tranny, but again, not hot or burnt.
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Problem started 2 days ago, driving around and my truck would stumble and lose power. Give it gas, won't rev up but it cleared and ran fine for a mile or so then it comes back (off and on all the way home). Check engine light didn't come on the first few times, came on a couple times on the way home (maybe 4 mile trip) but goes off when the truck runs fine. Thinking it was maybe the fuel pump (got 140K on the stocker). Talked to a few friends, some thought it was algae build up in the tank that was clogging the filter on the pump, underhood filter changed a couple hundred miles ago. Looked fine with slight brown build up at bottom of bowl when I replaced it.
Ran it around yesterday with a friend of mine and his scan tool hooked up, acted up once, check engine came on for a few seconds and shutoff. No code and for some reason we couldn't get it to live data while driving. I dumped in an algae eater yesterday and left the truck overnight since I had to work. Got home this morning to run her around the block to circulate the eater. Truck started and idled fine, went to pull out and she won't rev up, pumped the gas and NOTHING! Check engine light is on now but don't have a scan tool handy to read it. I heard the truck will store the code?
What this problem might be? What's a good scan tool for our trucks that can live data as well? CPS is good and already did the UVCH mod.
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My truck runs very rough and lacks power when cold, even during the Texas summer. Once it warms-up, everything is fine. It's almost like turning on a light switch. If it's plugged in for a couple/few hours, it's smooth as soon as it starts. I'm assuming it likes the oil once it reaches a specific temperature. What my problem is?
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I want test my fuel pressure. What is a good gauge or kit to buy? My truck has lost power towing and is now starting to miss a little. I'm wandering if i my problem is in the tank. Is there a good scan tool that would diagnose things too?
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So long story short I have a 99 f250 xl, 7.3 130k. Overall good truck but has no options, never had AC but would like to add it. I have seen the kits on bought4less. So I'm thinking all the factory parts should be bolt on, since the holes should be all there, and since most of the wiring should be there. I just need to collect all the parts. Also one question I have is, what goes through the firewall. Is it just the lines, or how does the ac get to the vents? Dumb question but don't get that part of it.
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Started truck 3 times in 30 min. no issues with truck before tonight nice well cared for truck. Went to get a pack of buns at store came out --NO CRANK--all lights are on dash, etc, new starter a month ago, relay changed out in fuse panel just to see if there was a change. Bought two new Motorcraft batteries installed , NO CHANGE, so is it natural safety, key switch, electrical ignition switch, solenoid on starter, is there a solenoid between key and starter?
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My brothers high mileage 7.3 ran out of gas because of a broken fuel pick up line. I brought him 10gal fuel, primed out of it and now the truck is sputtering and sounds like it's running on 2 cylinders. It's not just air in injectors or something it sounds like crap. It's getting fuel at least to the bowl.
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So for a while my truck sometimes and sometimes won't go into idle when I floor it and I've been trying to get the code and I finally got it it's tps high voltage so faulty tps??
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I was driving my truck then all sudden truck started losing power then slowly died. I restarted it, it was a lil shacky then died again. Iunscrewed the fuel filter and looked in the housing and there was lil fuel in bowl i turned the key to on position and bowl did not fill with fuel looked as if it were shooting some bubbles up(air) could it be outta of fuel???
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A few weeks ago I replaced my CPS on the 99 7.3. Today was the first day I drove my truck in the rain. When I turned my wipers on, I noticed that I lost power and my truck started hiccuping. I read on these forums that an aftermarket CPS is most likely the problem, so I am planning on getting a ford CPS this afternoon. My biggest concern is that before I replaced my CPS, my wipers only had 2 speeds. Also, if I pressed the end of the blinker switch to squirt the cleaner the wipers would not turn off until I turned the truck off. I am not sure why this would be happening and I wanted to ask if there is more than just the CPS involved with this.
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Truck started losing power then service engine light came on, drove about another mile then it just stalled ( almost home lees than a 1/4 mile). Got out open hood oil everywhere on top of motor. Looked under truck and oil all over the road. Looked back where I was driving a line of oil as far an I could see. Checked oil barely any on stick. Where should I start hpop or plug?
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I have a 2002 F250 Super Duty. Was driving it and it started to lose power and shut off. Then wouldn't start like out of fuel. No engine light no codes. Truck has 155k on it. So just because I replaced fuel pump. Truck runs but not right it's ruff no power kinda back fires in exhaust. I check wires and plugs under valve covers all seems ok. I ran truck and pulled each injector loose and engine would stumble. As in they are working. I replaced cps. Just because still the same. Then the truck started running right. But the truck runs but has knock but knock goes away and truck has full power. Yes oil is full and I change it regularly. The problem is off and on like electrical.
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While headed back to town my 2000 f350 7.3 with 444,650 miles (I'm original owner) and have performed maintenance and repairs since mile 3. Truck started to loose power and eventually stalled, was able to restart several times to limp home 7 miles in one hell of a snow storm. Very confused, replaced cam position sensor ( keep one in jockey box ) replaced fuel filter truck starts then stalls out. Don't know if a bad HPOP would allow start up at all. Fuel pump???
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