Ford 7.3L Power Stroke (1999-2003) :: 2001 - Acceleration Significantly Slower
Apr 15, 2016
I have owned several 7.3's and I have never encountered this issue. I recently picked up a 2001 7.3 with 200k miles on it. When I bought it I knew the glow plugs were going, I also knew it accelerated slow. I went ahead and replaced the plugs, valve gaskets, and added a heavy duty glow plug relay, along with an oil change, and fuel filter.
For some reason, the truck just dose not accelerate very fast at all, significantly slower than any 7.3l I have owned in the past. It appears that I shift at about 3000 rpms and it takes a while to get up to speed. I would like to get it mechanically sound before I restore the body. I was thinking it was the ebpv? but what else could it be?
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I have a 2002 F350 7.3 with 76,000 miles (still a baby) ... about a week or 2 ago i got in my truck and went to start it like normal, except instead of whipping over and firing right up in the snap of a finger, it kinda had a slower cranking time and took a second or 2 longer than normal. My first thought was maybe the battery's, BUT there basically brand new !!! not even a year old !!! ... so i figured maybe a starter, but i just left it as is, it still ran normal after firing.... Until this morning, I went to go start it and it cranked over 3 or 4 times real slow and would crank any more, it did this to me multiple times. Its acting like dead batteries so i put a jump pack on it, no change. I am thinking maybe a starter ....
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2001 f350. 7.3 has 350k on the engine. Last week it cut out and stalled it was about 15 degrees and though.. fuel had jeld... it warmed up.. didn't happen again. Then two night ago.. happened 4 times in a row then it was fine. yesterday a dozen times at least. It stalls but restarts itself (roll starting i guess) the water in fuel ,CEL and wait to start lights come on and then go off. We started with fuel filter, have changed the cam position sensor (yes with ford part not part stores) and now have also changed the Injection pressure sensor (also with ford part) while it needed changed as it was leaking oil the truck is Still stalling.
My dad is a technician He hooked his computer to the truck.. nothing. He was able to get the truck to recreate the problem with the scanner hooked up. When it stalls if he holds the throttle down the truck stays at an idle and the CEL, wait to start and water in fuel lights are on. It decelerates and puts along as nice as you please with the fuel peddle to the floor! let off the accelerator, lights go off and it recognizes the throttle again. No codes at all. hes thinking its the pcm telling the icp to shut off fuel. What would cause it to do that?
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I own a 2000 7.3 6 speed with 175,000 miles. I just bought it less than a month ago and it is my first diesel.
About a week ago I stepped on the gas and it just had nothing. I have a TS 6 position chip that I unplugged as soon as I noticed the loss in power. When I first bought the truck it was incredibly fast and now it has nothing to it at all. I have to have it higher in the RPM's to go up hills (especially when its not warmed up). If I push the pedal down it will sound the same, boost will get to about 14 (without chip) and the truck doesn't let out any smoke but it just doesnt have any power at all. I recently towed another vehicle on a trailer and it really struggled with it, more than I thought a diesel should.
When the chip was in, the truck would let out black smoke even after I noticed the loss in power. That made me think that the engine was getting enough fuel. I thought there could be a boost leak somewhere but it still builds 14 psi. However, I do not feel boost kick in at all! When I first got the truck it would only build around 14-15 stock but it felt a hell of a lot faster and I could feel when boost would really kick in. I took off my intake and looked at the turbo and the fins are in great shape and there is little to no play.
What the problem could be? I don't have very much money to start dumping parts into the truck and Im not sure what to do. I guess my questions would be:
1) Is it a boost leak, fuel problem, or something else?
2) Could a gelled filter give me these problems?
3) What should I do and where should I start?
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A little background first on my 1999 Ford F350 7.3. A few months ago I noticed i had fuel in my coolant which lead me to a cracked injector cup. I replaced all 8 cups and since I had it apart, and I bought the truck used and didn't know what had been serviced, I replaced the injector o-rings, glow plugs, valve cover gaskets, and valve cover gasket wiring harnesses. Got it all back together and had been running great.
About a week ago I was parked with engine running and the stereo suddenly turned off. A few minutes later I turned the truck off and turned it back on about 10 minutes later and it wouldn't start. Batteries appeared dead so I jumped it and made it home. Took both batteries down to AutoZone and since they were under warranty got two new ones. Figured out my alternator was bad and not charging my batteries so I ordered a new one.
Up to this point truck has been running fine. Truck had sat in my driveway for the week while waiting for the alternator. While I was out of town my father in law went to use the truck and noticed it wouldn't start. He hooked some jumper cables up and got the truck started. He said as he drove off the truck had no power and smoke was pouring out the exhaust.
I charged the batteries and installed the new alternator. Truck starts great and seems to be idling normal. When I took it for a test drive it has no power when accelerating and black smoke pours out the exhaust. The truck will barely make it up any type of incline.
I thought maybe it was the injectors not firing. Wiring harnesses are plugged in and do not appear to be damaged. I did not remove the valve covers yet as it's not difficult but time consuming and I figured since I just replaced all of it that it should be ok. I did a buzz test and all injectors passed. I get no trouble codes or check engine light.
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I just put a regulated return system, two external filters and two fuel pumps, and I am still have problems.
Under acceleration driving it drops to almost 20 psi and that only 1/4 throttle.
3/4 throttle drops to 10 psi and barely idel. Died twice a block away from my house of test drives.
Tank is done with mods, new cps, icp, and ipr.
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I have a 2002 7.3 Excursion with DP Tuner. Truck has 167K on it. My check engine light came on when I was driving to work this morning. Stayed on for the ride home. Appeared to drive ok - a little rough - but it has been that way for a while. When I got home I plugged in the AutoEnginuity and this is what came up:
So it appears I have a glow plug issue. That does not surprise me as I have had some rough starts this past winter. On a whim I ran the Cylinder Contribution Test and it completed successfully. Yet when I started the truck again it completely falls on it's face when accelerating. Here is a link to a video: [URL] .....
It did this once about a month ago. I was driving to work and stopped at a light and when I tried to accelerate, it did this. I limped to a gas station a 100 yards away. I let it sit and started it up, drove home. Went in the house and did some googling and of course after I came back out, it worked fine. Has not done it since.
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I just recently installed a CTS2 Insight and wondering what the typical boost pressures I should be seeing without a load just normal driving. Right now I am seeing mostly 0 unless under acceleration then it goes up to 10 psi if I floor it I am getting 15psi.
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So i replaced the faulty injector and the truck starts up great and runs great. The only issue is that now when i accelerate, the SES light comes on until i let it up a little. If i am at cruising speed or just a steady speed the light goes off. I havent checked for codes yet because the light didnt stay on. I have AE and know how to use most of it. Is there something i should be looking at? Could it have something to do with the Blue/Gray CPS i installed or maybe there could still be an air bubble in the oil rail from when i drained the rail ? I have a DP tuner and stage-1 injectors. Regardless it sure is nice to have my truck back out on the road. It was a horrible 3 weeks without it.
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So I have noticed that my Batteries have been low each time my truck sits. Also my headlights have been dimming/brightening with acceleration. So I thought my Batteries were going bad. So I did some tests, I let my truck sit over night and tested the Batteries before starting they both were around 11 volts. @ idle no load 12.3, with load 11.7. @ 1500 RPM 14volts. With this I went to autozone and had the Batteries tested and the guy said that they are good but need to be charged and that the alternator was not charging right causing the low Batteries. The Batteries are about 3 years old. So now Im not sure what to do.
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Started noticing a whooshing noise when I let off the accel pedal on my 2002 F250 7.3 powerstroke.
You can hear it best towards the end of this video: [URL] .....
What could this be?
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2002 F350 7.3, MANUAL transmission ZF6.
Bought this truck used for hauling an excavator, and after fixing damn-near everything engine/turbo/and-cooling-system-related ---- it's finally seeing some use.
Just recently started hauling 12,000lb payloads. When I accelerate hard in Low gear, and then shift into 1st and accelerate hard again, I feel the whole truck shuddering. It's like a shimmy-shaking vibration all through the vehicle.
It doesn't happen in higher gears, only when the following conditions are met...
1) Starting from a dead stop
2) 12,000lb payload (heavy)
3) Accelerating hard (Low, First gear)
I would also like to add that I experienced this shuddering vibration very intensely when I put the transfer case in 4wd LOW (front manual hubs left unlocked) and towed 14,000lb up a steep hill in 1st, 2nd, and then 3rd transmission gears.
^^^ By leaving front hubs unlocked and transfer case in 4wd LOW, I was effectively lowering my final drive ratio even more for extra pulling power in 2wd hill-climbing. I don't do this often, only when absolutely necessary. ^^^
I must also add that I do have slightly taller rims/tires than OEM ford WITH the original ford gearing (3.73) so I'm more like 3.51 final drive ratio.
02 F350 7.3l ZF6
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Ok, my clutch has been giving me trouble for a little bit and I'm almost positive that I have a bent release fork. It also slips under heavy acceleration in 6th gear. I am planning on doing a clutch, compete with flywheel and release fork and a new rear main seal. My problem is, here within the last couple of days the trans would pop out of 4th gear if I was just coasting. It has been getting noisy over the last few weeks also. I'm no manual tyranny expert, but this is making me think I'm gonna need to have it rebuilt.
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My 2002 f350 7.3 was given to me in July of this past year. I was 15 at the time and I was told that it was hydrolocked. Funny enough this is where I came to learn how to fix it, and this is the first time I have had to ask a question . I pulled both heads and replaced all 8 injector cups, I also had the heads re surfaced and had 7 injectors rebuilt and 1 replaced. I got it on the road in February around the 20th and since then I have put about 300 miles on it. Today I stopped at a red light and made a left turn and as I went to accelerate the truck jolted forward a few times and it felt like a tire was going to fall off while accelerating(only to 30mph). I pulled into a driveway to check all the tires, then I turned around and my foot was hard to the floor and the truck wouldn't go over 15. Diddn't smoke when it first happened, but after getting it off of a flatbed I turned it around and it hardly had enough power to get up my driveway. And I noticed it was pushing a steady stream of white smoke, the oil is clean and the oil cap doesn't get blown off at idle when I set it upside down on the valve cover.
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My 2000 7.3 2wd is making a knocking sound while accelerating. It speeds up as I accel and when I let off the gas it gets louder. It slows down all the way to a stop when the truck slows to a stop. I can feel it in the floor board a bit as well.
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My truck 00' 7.3 255k is smoking white. It's not thick its more of a white haze. Sometimes it does it sometimes it doesn't. It has a 6637 intake, exhaust, and wicked wheel. No tuner or such. Im thinking either the turbo is going out or maybe a leaky injector? Just checked the turbo wheel and it has a little side to side play. On start up itll puff white then go away but then under heavy acceleration on occasion there is a haze of white then goes to haze of black. It also feels like the truck is lacking some power. There is no oil in the coolant or coolant in the oil. Not consuming oil or coolant. And there is no excessive pressure coming out of the oil fill.
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2002 F350 single wheel 4x4, 280k miles chipped with a 6
My problem first started when the bottom of my sending unit broke off in tank causing me to run out of fuel at 1/4 tank. I dropped tank and repaired. A week later I noticed fuel dampness on my tank and discovered I crossthreaded cap on sending unit. About this time I started getting a shutter at slight acceleration only and a harder hit at idle. I thought air in lines so I dropped tank and reassembled. No air in line at all now but I still have a shutter so I replaced fuel filter in case of obstruction. No luck. Now since I have owned truck it has been a pain to crank in cold weather if it wasn't plugged in over night. It has been hard lately even in moderate weather since shutter started so I replaced both batteries today.
I replaced the ICP today also because I noticed the other day when there was oil on and around harness to it and when I unplugged it today the truck changed idle and there was oil inside. After I changed it I took it out and it still had the shutter and sound of a miss. At about 8 miles in it just died going down the road. I coasted to the side and it cranked right back up and drove home. The shutter doesn't fill as bad but there. Also I live in the mountains and on my way home after cutoff I had chip in Stock position and had to put peddle to the floor to climb hill. I've never had to do that. I'm getting worried I work for a living and caint keep throwing money at it aimlessly. I'm thinking at this point IPR or CPS. But I'm no mechanic so I could be completely wrong.
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I have 2001 F250 7.3L 261k miles.
Over the last few months, I have noticed that my truck is taking longer & longer to start after sitting for a long time (i.e. every morning, after work, etc.) When the problem first started (3-4 months ago) it would crank for 2 seconds & nothing so I would turn it off, let the "wait to start" light go off again (depending on outside temp 10-20 seconds) & then it would crank & usually fire right over like it was new. That seemed to happen only in the morning when it was 70 degrees or colder outside but no problem after work when it was 80+ degrees.
As the weather has gotten colder, it has gotten progressively worse. A couple of weeks ago, it was in the 40s in the morning & it took a solid 8 or 9 minutes of cranking for a few seconds, then trying again before it started. Once it started it did "chuga chug" a couple of times before it smoothed out. Last week when it was 16 degrees in the morning, it wouldn't start at all. I tried for a solid 15 minutes before I gave up.
I will say that as it has gotten worse over the last couple of months, I have noticed that it's cranking w/o firing but I will hear it fire once or twice per crank before it will fire up & run. Once it starts, it runs like a champ. No studders, stalls, slow acceleration, etc. Pulls like it always has. The weirdest part about it is that once it starts & runs for 30-60 seconds, I can shut it off & it'll fire right up every time. If I get it up to full operating temperature, I can go back & start it right up 2 or 3 hours later w/o a problem.
I did notice my oil cooler is leaking pretty badly (that will be fixed this weekend) & my valley has fluid in it but it's hard to tell if it's diesel, oil or a combination of the two because my truck is setup to run on WMO (waste motor oil). I have dual tanks so the OEM tank is diesel & the auxillary tank is WMO. I have 2 mechanical fuel pressure gauges on my fuel bowl, 1 pre & 1 post fuel filter as well as an aftermarket Walbro fuel pump. The fuel pressure when running on WMO has always bounced a little bit between (65-75 psi) but the fuel pressure on diesel has always held solid at 75 psi until recently when I have noticed that it flutters a very small amount between 73-75 psi.
I have verified that the GP Relay works & was leaning towards a glow plug problem but considering it was having troubles at 70 degrees ambient temperature, I'm hesitant to think that's the true problem. I think that might just be adding to the problem. I live in the south so my truck doesn't have a block heater but I'm going to add one this weekend when I replace the oil cooler gaskets & o-rings.
I'm also going to pick up a new Android tablet today (replace my broken one) so I can use the Torque Pro app to monitor ICP, HPOP & InjPW. Finally, I had a DP Tuner chip on it & to remove that as the possible cause, I removed it & the same symptoms continued.
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I'm on the road and I pulled over for a pit stop so I don't have time for a search right now, but I noticed under heavy acceleration a turbo whine so high pitched it almost sounds like metal on metal. Is this normal and I just noticed it, a leak somewhere, or maybe indication of something worse? The truck seems to be running ok otherwise. It's an '02 w/7.3 and 220k miles.
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Was hauling a bobcat this AM and noticed something odd in my rear view. Under steady accelleration (either light or heavy foot pedal pressure - steady either way), the exhaust would puff out sporadic extreme dark clouds of smoke. The puffs weren't fast like every cylinder rotation.. but every second or so.. puff of very thick black smoke mixed in with the expected black smoke we see.
Truck has 350k miles with regular oil changes. Year ago someone hooked the injectors up to the computer software (buzz test) and all of them checked out to be in very good condition.
The same tech pointed out some dark blowby at the uppipe on the back of the engine. Other than that the truck is in pretty good condition for its age. What could the sporadic very thick/dark puffs of black smoke indicate?
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I have begun to notice a "Knock" or "rattle" in the engine. I know diesels have a tendency to sound like that just from running but that sound is more of a "cackle" if you ask me.
I can hear the "knock" most noticeably at hard acceleration or taking off in general. It can also be heard during idle and every so faintly at deceleration with the torque converter locked so it makes me thing its mechanical due to the nature of the way the sound is audible.
I believe the sound is coming from the passenger side bank as that is where I can hear it the best with my head under the hood. I have a code reader and checked, I have no visible codes other than it telling me about secondary fuel circuit high which I suspect was from showing off with my friends.
I did a cylinder balance test and again got 3 (PO269) and 8(PO284) which I have been told are very common.
I checked my ICP readings and it was 500~ and 11%
Pulse width for injectors was 2.50~
I did a KOER test and received no codes
Glow Plugs showed okay
KOEO (PO605)- Internal Control Module Read Only Memory error.
Exhaust Absolute Back Pressure was 16.2 at Idle with MBRP 4" Turbo back.
Also, I have noticed a drop of about 5-10 degrees in my oil temp and about 100 degrees drop in my EGT's although it has been pretty cold here recently (32 degree oil temp when I started her at 2 in the afternoon)..
I think it might be a bad piston skirt? I am guessing that from my experience with motorcycle engines but these are a totally different beast and that is why I am here...
I have 634,000 Miles and from what I have been told the engine has never been broken into so I would expect something like this myself. I am mostly looking for a place to start. Should I pull the oil pan and look for debris? (Oil was clean last time I changed it less than 2000 miles ago).
Should I pull the passenger bank apart and look inside? Is there a chance I am just hearing the noise due to the additive wearing off and me being used to the quieter engine?
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