Ford 7.3L Power Stroke (1999-2003) :: Loud Whistle While Under A Load
Jul 8, 2016
First off I have a 2001 7.3 with 294000 miles. While pulling my camper after it gets warm it puts out a very loud whistle it seems to happen when the fan clutch kicks in it does not sound like a belt squeal it almost sounds like it's coming from the turbo area. The engine seems to Surge while this is going on but the RPM gauge doesn't dictate that it almost sounds like it's the fan clutch surging. I took a short video of it while it was doing it ...
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I posted earlier about a whistle that appeared when I was towing my old travel trailer (6000 pounds). It only happened a couple of times, and I had a hard time replicating it, so I elected not to waste any money with the deductable, and possible additional costs for a non-covered issue at the stealership.
Now, I am towing a larger 5th wheel trailer (11000 pounds), and am experiencing this whistle on every steep grade, while towing. Below are a couple of things I noticed, that had to be, before I would get the whistle:
* It only seems to happen while the cooling fan is engaged, and also only when the rpms reached 2800 and above.
*If the fan was on, but the rpms were turning below 2800 rpms, then it would not whistle. It would, however, after the transmission downshifts, bringing the rpms back up, while climbing.
*If the engine was spinning at 2800 rpms, and the engine fan was not engaged, then it would not whistle, until the fan would kick in.
* It only seems to occur when I am climbing a steep grade, on a warm day. Although, I haven't experimented on steep grades on a cold day...
It sounds to me like there is an issue with the engine fan system, but I thought I would put it out there, just in case any of the diesel guru's out there might know of something else that would cause a whistle like this, i.e., turbo?
Oh by the way, I also think that I have a performance reduction lately. However, I can't know for sure, as I have never towed this much weight with my truck before. I just kind of expected that I would be able to pull to the top of these grades, with a little extra peddle to spare. I have to floor it, just to "try" and keep up with traffic. And I haven't calculated my fuel mileage while towing this beast yet, but WOW, that fuel gauge needle sure does drop like a rock!
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I have a 01 7.3 F-350, 120000. I rarely get down hard on the go pedal but a while back I did and heard at pressure whistle just before it would shift. I thought a bad turbo hose so I replaced them all. 'While working on the hose mounts I cleaned up the castings for a better seal'. The hose replacement seemed to get the running but the whistle is still there. I am thinking a leak on the manifolds for the Y-Pipe connection OR does the turbo have a release valve that can make a whistle sound?
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I will start with what I have done to my truck. Hutch and harpoon mod, fuel pump, new orings on fuel lines, fuel filter, air box, 4" exhaust. My issue only happens when my engine is warmed up and I put it under a load(driving up a long hill or pulling up a long hill). My truck starts to shudder and feels like missing until it looses all power to where it won't even pull itself and will just barely idle. It doesn't die though. I watch the engine oil temp and it seems to be around 195-200 when it occurs. I can turn the truck off and let the oil temp cool to 150-160 and then start the truck up it will miss for a second then clear up. I will start driving again and it seems fine until the oil temp gets up and start putting it under a load. I have read many posts and can't figure out exactly where I need to start. Some of the codes I pulled are P0603, P0470, P0732, P0542 and P1211.
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1994 f250 7.3 turbo problem.. runs great on the level.. Cruises 65 no problem.. We have an 8% grade coming from town and half way up it starts cutting out and sounds like a jack brake under the hood and loses power.. Once over the top it clears out and runs fine again.... I just changed the fuel filters but no luck... I have been wrenching on cars all my life but no diesels..
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Been fighting a coolant issue on '02 F250 4x4 with 7.3. Truck runs hot when under load (ie towing, or ac running on a hot day going down the road). Will sit and idle all day with ac on high and 100 outside. I hear my fan at cold start as normal but that's the only time I hear it. Still has original water pump, fan clutch and radiator. I know all three could stand to be replaced with 340,000 on it. But can't afford to do it all at once.
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The issue: when I reach 37-40mph I have a new sound which I believe is the transmission 4R100. It sounds like a flat spot on a tire, or the sound tires make when they leave the sticker on them. The cadence of the sound is slower than the rotation of the wheels.
If I let off the accelerator, the sound stops, as soon as I add load by pressing the accelerator the sound returns. If I shift to Neutral the sound is gone.
If I coast at any speed the sound is gone. It is only audible when under load at speeds above 37-40 mph. The cadence does increase as I speed up, but it doesn't sound as fast as the motor is turning (~1900 rpm's).
I monitor the truck with torque pro using the PIDs defined here on FTE. I can see lock-up in 3rd and the shift to overdrive. When in lock-up, I see 1-7rpm TCSlip.
Watching transmission temp as reported by torque, the hottest I see is 183* pulling an enclosed 6x12 @ 75 mph. Ambient temp is 95*. Excursion currently has 240k miles on the clock.
This sound was first heard by my wife two weeks ago. I thought I had tire issues and they needed to be rotated. The sound is still present, and now identified only when the truck is in drive, and under load, regardless of me pulling a trailer.
Yesterday on my 500 mile trip, the truck hiccuped several times which I believe was around the time I was either moving in or out of overdrive. Details in a different thread: [URL] .....
Anyway, I've looked at all culprits and can't find anything with the motor, or electrical system. I can't get to a transmission shop until Monday, and won't have my AE until I get home Sunday night. I have a 500 mile run tomorrow. I checked the transmission fluid and it's at a good level, pink, and doesn't have a bad smell.
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I have an 03 F250 7.3litre. I have noticed the last few times driving while hauling that my vents start pushing hot air when under a load (example: driving up a long, steep pull) even if I have the AC on. It's starting make me a lot hot under the collar (pun intended) .....
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Ok, I have owned my truck for almost a year and it has 151,000 miles. I have noticed on a few occasions puffs of blue smoke and especially at night in the headlights behind me I notice a lot of smoke when I'm getting into the throttle hard. Under normal driving conditions I don't usually see anything.
Today I noticed it when I was backing my camper(8000lbs) up a small hill onto the side of my garage. It was puffing blue pretty good going up the hill while it was under load.
I have no check engine light on, the truck seems to be running fine. My oil consumption is about 2 quarts every 3-4000 miles. I tried the blow by test with the oil cap but besides some smoke out the filler neck no problems... I don't know very much about diesels so for me to try and trouble shoot this is a problem.
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I have done some searching on this, seen a video on YouTube but haven't read anything that is firm on what it is. We pulled our 5er for the first time last weekend and the chatter was pretty pronounced in the Arbuckles here in OK. I was running around 65 mph when I hit the largest hill and as I was climbing my speed naturally dropped, boost was around 17 - 18 psi when the chatter started.
Is it something to be really concerned about? Is there anything to be done to prevent it? I'm pretty much still stock, only deletes have been airbox to 6637, and I deleted the heater by turbo for the boost gauge. Other than that everything on truck is still stock.
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I have a 2001 F450 7.3 chassis cab with just over 100k. I have a new problem... So far on two different occasions the service engine came on followed by a loss of power under a load and white smoke from the exhaust. Took it to the shop the first time, they determined it to be a dirty air filter, which seemed odd since it just happened all of a sudden. They changed air & fuel filter, problem gone- for two weeks..
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Ill start off with my mods and recent maintenance things I have done before fully describing the issue.
E99 7.3l with 190k on the clock
Full 5" turbo back
TS-6 chip
EGT, Boost and trans temp gauge
New ford glow plugs
Re-orings injectors
new valve cover gaskets
new fuel filter and fuel lines
new turbo with a ww2
Newer trans and oil pan
I think that should do it, now for my problem. The truck starts good cranks over once and is running with no hesitation, the engine run a little rough, more than normal vibration at idle almost like a small miss. No smoke at idle.
While driving with no/little load on the engine runs great , but under load there is a good amount of white smoke/ oil smell. The turbo is new and is not leaking oil I have already checked over that and the exhaust is new but there is some oil that is at the tail pipe in liquid form. The exhaust up pipe that goes to the turbo is not covered in oil either
The truck cruising in OD or in 3rd with O/D off around 2k rpms it shudders real bad almost like the truck is going to shake its self apart. but at like 2400 rpms and above its fine. Where is a good place to start the diagnosis as I am pretty new to the Diesel world. From what I've read it looks to be either rings are junk or maybe I have some bad injectors (thats what it feels like to me) but would that cause it to smoke like crazy?
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My rearmost drive shaft u-joint is bad and has slop. I've been having vibration for about 7-8 months, but just started hearing a noise within the past week, especially when taking off with a load on the drive line (uphill or heavy acceleration). The vibration has not gotten worse, just that the noise has just begun to show itself.
I have one u-joint which is OE and has 275K miles on it, and it seems to be OK at the moment. The other two (including the rearmost unit) both have about 100K miles, as does the center support bearing.
Just because I don't want to worry about anything, I'm going to replace all three u-joints with Moog Super Strength units, and will also replace the Center Bearing with a new Spicer unit... just because I can and don't want to be pecked to death with multiple failures in the same drive line. I ordered the Moog joints because the only Spicer joints I could find were for the 4wd configuration.
That's the context... here's my question... The parts are on order and won't get here for several days. I've been driving the truck like it is at about 1500 miles monthly. Do I continue to drive the truck for another week before getting the joints and bearing installed? I know it's a guess... just looking for more perspective.
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I only hear it in gear under load so I can't stick my head under the hood to pin point it. I dont see any black streaks and I replaced the EGR tube. Is it commonly just the gasket or do the manifolds crack? If they crack where?
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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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38k and 15 months old. Runs fine except...
Can be in cruise or not, tow/haul or not, but need to be pulling a decent hill with 7k+ trailer. Running level with air bags. Regardless of speed, cruising at 50, 58, or 65, beginning incline and turbo boost builds normally to maintain speed to the point when it needs to downshift. BAM!!, not just a clunk, 90% of the time- scares the hell out of me. I can make it do it on an incline empty, but it it difficult. If because initial speed is 50ish, a second downshift to 4th may be needed. A bang only 50% of the time.
No codes.
Regardless of the degree incline, (toughest in the NC/KY areas is 6-7% grade, can avoid harsh shift by backing off on throttle and manually downshifting to 5th or 4th, depending upon speed.
Can "make" it do it on level terrain with 7k trailer if I slowly back off throttle and slow from 65 to 50 or so and punch it, but not too hard. Too hard and it goes to 4th, usually with just a modest clunk. Just right and I get 5th with a loud, and I mean loud BAM. Even the tech was impressed.
Afraid to hook up my 17k 5er and take off for the next 3 months, which is the reason I bought the truck to replace my 11...
Carrier bearing has grease coming out of it (400k on various duallies and never seen this), but dealer says not an issue.
Ford told dealer that it had no idea, and advised tech to do a lot of pin point electrical testing and everything checks out. Next stop is the inner workings of transmission.
I have been without it and work for 3 days because of backlog. Running two day load tomorrow, then back in for tranny work.
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Pulled out of the restaurant I ate dinner at tonight and I lost most power and there's a loud air sucking sound. I felt around all the boots and didn't feel any air, but it was really hot and couldn't feel a whole bunch. It's a 2003 7.3 with 295k. There is a little smoke/soot coming from the turbo area, any chance that's related? I'm perplexed...
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Last year I did some major work on my 02. Painted it, new injectors, 38R, and once it was back together, the transmission went south in a month. Got a Ford reman HD4R100. Shortly after the install, when in reverse, the torque convertor would lock up when you stepped on the throttle. As soon as you let off the throttle, it would disengage. Thinking it was a tranny issue, got another one from Ford. This one has been in the truck for about 9 months. And it seemed fine until about a month ago. It started doing the torque convertor lockup thing in reverse like the last one, but not as often.
Then last weekend it did it every time I put it in reverse. Then yesterday, while pulling away from a traffic light, there was a loud bang, and lost power in the transmission. Once stopped, I found out it has manual 1st and 2nd, but nothing else. No drive, overdrive, or reverse. I personally believe something electrical led to these issues, and ultimately, the transmission failure. I know the truck is not stock, but I do not run it hard very much. When it went bang yesterday, I was not being hard on it. Where to look at what is causing this?
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Coolant temps getting much higher than oil temps under load. Is there any problem that could cause this other than a bad temperature sensor? Reading temps with an Edge CTS 2 monitor. Think I'm going to hook up a mechanical gauge in the morning and see what it shows.
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I found an interesting thing, when I start the truck right away without waiting for the glow plug light to completely cycle (Engine at operating temp) the engine will lope REALLY bad. Now, when I wait for the glow plug light to finish and then start the engine, it runs as normal. I checked and cleaned the PCM pins for the chip and everything is good. Ghosts & gremlins.
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e99 with 291K on 7.3L
Idle sound horrible. Sounds like a really loud dieseling or I dumped ball bearings in the topside of the engine. When I start to give it a little pedal, the sound drops to normal. No power issue I can tell.
This just started this morning. It happened when cold and then again when hot as well. While driving, and at temp, when I let off the fuel to coast or stopped at a light, the loud idle would cycle on/ off like someone was throwing a switch. When I got home and popped the hood, I could not tell where the sound was coming from.
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