Ford 7.3L Power Stroke (1999-2003) :: Strange Noise Occurs At Both Highway And Surface Street Speeds - Throttle Related
Aug 6, 2016
I have a strange noise that occurs at both highway and surface street speeds. On surface streets at low speeds 45 mph and under, if I let off accelerator to coast and lightly step on accelerator I get this quick sharp noise.
Everything I have read regarding a similar noise is under load and being described as a turbo fart. Clearly I am not under any load. I'm lost.
Definitely not a low woooo noise. Also not a hard accel and release and definitely no chuckle and or popping. The sound is high pitched and quick, roughly .5 to 1 second at most. The sound is more like a "zzzrrp" or "zzzoop". I can replicate the sound 50% of the time easily at speeds under 45 mph by briefly coasting (no accelerator) and lightly tapping the accelerator and releasing or holding. Occasionally this sound will occur at full stop when I step off of the brake pedal and before I step on the accelerator. This sound can also occasionally be heard at highway speeds under similar accelerator conditions though it may be more frequent and I just don't notice it.
Would this condition throw a code? Just received "Total Ford Scan Tool Package Enhanced Bundle SP03" scanner from autoengenuity. Hoping to put it through its paces tomorrow.
Additional info: 145k miles. Injectors serviced by a reputable diesel shop here in Vegas approximately 1.5 years ago. Unknown oil leak where oil is collecting in the valley on top of the engine beneath the turbo. HPOP seals were replaced roughly 1 year ago at another reputable diesel shop here in Vegas. Still have an oil leak (turbo related?) Oil is under 500 miles old and acceptable level. Fuel filter is due for a change but that does not seem to affect condition. Air filter 1000 miles. Thinking about upgrading to AIS severe duty kit soon.
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I have a 45 min drive to work every day, all highway. Lately on the way home in the afternoon I have been experiencing a surging noise that seems to just happen while I'm doing hwy speeds. It sounds to me like the fan is tuning on and off. Is that possible? It comes on for a few min. And then off again. I have new icp ipr cps. New oil and filter and fuel filter.
Also I'm still having a battery light on and off issue while I'm driving. Is possible the two issues are connected. I plane on doing extensive search for a bad wire this weekend. Batteries and alternator have checked out and are fairly new.
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I'm a mechanic but work only on cars so I'm a little shy on diagnosing trucks. I have a 2001 7.3 f250 4x4 short bed, when I give it gas I can hear a clunk, when I let off of the gas I also hear a clunk. Also when traveling at high way speeds I can feel a strong vibration when I very lightly give it gas but the vibration goes away as I give it more gas.
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I have a 1999 F350 200,000 miles. Now getting an intermittent engine light. Still runs well, although once or twice I felt a momentary surge at highway speeds. The light is on intermittently about 1/2 time. I read the codes and the following codes, as in the thread title, came up:
P0280 - ICP circuit out of range - low
P0113 - intake air temp sensor circuit - high input
P0470 - Exhaust back pressure sensor circuit malfunction
P0478 - Exhaust pressure control valve - high input
What would make these all code at the same time? Would these not make a noticeable problem driving? And how do I resolve these?
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Ok I have had this noise going on for about 1 week before transmission went out. I just built the trans and its still there.
I had a mishap years back with front end hub bearings so I replaced with New Timken Bearings. Well that wasn't it but at least I know where I
stand with those. It starts making a noise when slowing down about 3-5 seconds before coming to a stop. I thought maybe the carrier bearing in
driveshaft?
Pinion bearing in rear diff? I need to service the parking brakes on rear so I may pull it down and go through it.
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I have a 01 f250 7.3. Every once and a while when I go to start my truck it make a strange noise, very similar to the sound a vehicle makes when you try and start it while it's running. if I let off the key and try again it will start. Sometime it will do it 2-3 times. So far I have never had it not start after a few tries. Can't seem to put a reason behind when and why it does it. Sometimes it will go weeks without happening, sometimes it will happen twice in a day. Starter is year old but put a cheap one in it. Is it my starter or something else.
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165k miles 4x4 6 speed, bone stock unmolested
Slowly progressing problem over 6 months. Occasional miss at highway speeds uphill has progressed to bucking and jerking during even gentle acceleration attempts.
I hadn't got my cam sensor recall done but no change after that procedure completed yesterday. Oil recently changed as well.
I have a torque pro but it never finds any fault codes even though 'service engine' light comes on sporadically. I'm not sure I'm operating it properly but it at least reads rpm when its running.
I'm contemplating the hutch mod but I'd like to have an official diagnosis beforehand if its possible in my case.
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The truck is a new to me 99 f250 7.3. The problem occurred before doing the brakes, and after. The front brakes had new pads and calipers(rotors appeared to be in good condition) while the rears got New rotors, calipers, pads. The persisting problem is a really bad brake shudder that seems to be getting worse. It only occurs below about 5-10mph when braking. on this trip back to school there is a hill with a stop sign at the bottom where i should have rolled forward when i let my foot off the brake. This didn't happen.
It almost seemed as if the tires(meaty 35in dick cepek crushers) where rubbing and catching on something. but we checked and it didn't seems as if they were, though they do come somewhat close to the bumper. Im not even sure if its brakes or what it is, a friend of mine said possibly the hubs, but what can i do to pinpoint it? I wanna try loading down the front with something to simulate the drop when braking and see if the tires do indeed hit as when going to a rolling stop with only a little braking it doesn't do it. Any other things to check?
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2003 f-350 6.0 4wd dual rear wheels
4 inch superlift suspension lift, dual shock steering Stabilizer
33 inch wheels.
4 inch turbo back exhaust
Other than that it's really bone stock
Here's what's going on. In 2wd, between 55mph and 62ish mph, once I hit a constant speed, a rumble beneath my feet emerges. If I either speed up or slow down, it immediately goes away.
Does the same thing in 4wd high.
I can eliminate front drive shaft and u joints seeing as they shouldn't be turning while in 2wd. I did notice that when I push up or side to side motion in the front drive shaft, there is a click and a bit of motion. Is that normal? Just a side thought.
When i take off there's a bit of vibration from the rear half of the truck, but I've isolated that to the center support bearing. With all this being said, none of these symptoms were around before I lifted it.
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Have a 03 f350 with the 6.0 have been experiencing very harsh shaking problems. This only happens at highway speeds 55-60 any other speed is smooth as can be weather it's 25-95 mph. The weird part is that it only shakes when the truck shifts into overdrive and it shakes bad and if you lay into it like you were gonna pass someone it stops then shifts back into overdrive and shakes again.
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I have a strange issue and it happens very sporadic. Sometime it occurs at startup, sometimes while driving. Not sure whether it is limp mode, but I have no throttle. It starts fine, idles, but no throttle. Like I said, sometimes it happens while driving and I have to pull over and shut it down and restart. Mods are few, it has an airaid air filter and I had the turbo rebuilt and egr delete both completed in May. FICM was rebuilt by ficmrepair.com a couple years ago. It does seem to happen more often when it is raining or with a heavy dew after sitting for many hours. 128k.
I adjusted the pedals all the way out and back in and it stopped for almost 5 weeks, but it has been pretty dry here in SW Ohio. then it got really foggy one day and rained the next and it has started again. Could it be that the EGR pigtail is getting moisture. It does not throw a CEL and my scan gauge II shows no codes. I did run a dose of hotshot's secret thru the fuel back in may, ran a couple tanks of fuel, then changed the filters with OEM. I have had this truck for almost 3 years, but still a newbie when it comes to diesels.
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Since day one my 2016 F250 occasionally has a reed sounding vibration at highways speeds near the passenger side occupant handle on the windshield pillar. Talked to a service advisor at the dealer about it, what it could be, so this must not be a common problem . The issue is intermittent and can not be reproduced on demand. I tried blowing compressed air all around the area of the Windshield to see if I could reproduce the sound in a shop setting, but no luck. Only thing in common with this noise is 75+ MPH during a rather windy day. I'm a little reluctant to drop it off at the dealer since intermittent problems are hard to diagnose.
YouTube...
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I noticed a moaning from the front end a few weeks back and it seems to be slowly getting a little worse. It is only noticeable when I'm accelerating or maintain speed, but as soon as I let off the accelerator and start to decelerate, it goes away. Sometimes, when the truck hasn't been driven for at least a couple hours, I pull away and there is a really noticeable sort of "clunk clunk clunk" but then it goes away and it just moans. I can also hear some noise from the front end at highway speeds, but of course it is hard to hear much else other than engine and road noise from the cab. It's a 2003 F250 with a 7.3 and four wheel drive.
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My S10 started downshifting at highway speeds when I slightly let up on the throttle. It only starts after driving 20 or 30 miles down the road. (gets hot?) It also hesitates slightly starting from a dead stop as well after that. I dropped the pan, cleaned it up and added new fluid. There was a fine powdery sludge on the magnet in the pan, but no metal shavings. It is still doing the same thing.
It has 95,500 miles on it. 2.2 motor. The fluid was low a couple weeks ago. I added a bottle of conditioner. Don't remember the brand name. 2 reservoirs in the bottle so it mixes as you pour it in. It started acting up 7 days ago.
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This is very weird. A strange noise occurs intermittently. It sort of sounds like a pulley slipping on a steel shaft briefly followed by a brief rattling noise and may or may not blow out fuse number 14 (A/C Pressure switch, backup lamp and daytime running lights, redundant speed control heated pcv, ABS, Reverse park aid, EC Mirror), then the brake light and the ABS light is displayed and the cruise control quits working. It does not ALWAYS blow out the fuse as I discovered yesterday.
The first time it happened (about three months ago) I was doing 75 when it happened and was unable to figure out what it was. Yesterday it happened and I new it was fuse number 14. I replaced the fuse and it happened again within 3 minutes. It may be when I turn the wheel to the left. The first time it happened I was changing lanes, yesterday when it happened I was on a ramp turning to the left. In the driveway it happened as a backed up and turned the wheel to the left. I cannot identify where the noise comes from. After the noise and the blown fuse the truck runs just fine and I can continue to drive.
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I put a ts6 on my 2001 7.3. I love it shift points are better and truck has a lot more power. But I've noticed when I shift truck shifts into 3 (especially going uphill) I get a really weird turbo sound where it acts like its gasping for air (I have 6637 air filter) and then it shifts kinda rough into third. If I put chip on stock setting it doesn't do either of the things I described. Do I have loose turbo boots somewhere or possible bad turbo bearings?
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I drive a 2002 Toyota Camry. Mostly runs great! If I drive on the freeway at 60-70 mph for 30-45 minutes, when I get off on surface streets the engine starts to die. I have to keep one foot on the brake and one foot on the accelerator to keep the engine >1000rpm. When I park at my destination and park the car for 1-2 hours, everything is fine when I start up again. Happens repeatedly - not always, maybe 95% of the time. Two mechanics can't figure it out and are unable to reproduce the problem after they drive the car on the freeway.
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This morning on my way to work I pulled up to a light and the check engine light came on. I went to go and had no throttle response at all. The truck just idled through the intersection. About 45 seconds later the light went out and truck ran fine all the way back to work. What to look for or what it could have been.
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i got a 99 F250 powerstroke with 148K on its clock, i have a couple issues that i cant find a definitive answer for, 1 just started recently, Its an automatic and when it shifts into third around 40 mph the rpms drop to 1200-1300 or so, its done it since i got it, but recently it wont accelerate like it should or used to do, i have to put it down and make it downshift to recover.
Now I have no CEL. and it is still running perfect just has very little power, I do have a 4 inch turbo back exhaust and have a TS 6 position chip with i usually run in +50hp mode, but it does this in all positions. Now issue 2 is when its 30 degrees sometimes it will not start. It'll turn over with now fire. but if i cycle the key again it'll fire right up like a champ? It has a 4 month old starter and batteries and a month old alternator and i have tried several CPS' and Contently check the connections.
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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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My 7.3 has no throttle response, the code reader says pass, and there are no codes, would it do this even thow it has a bad TPS?
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