Ford Excursion :: Driveline Clunk When Going Over 40mph And Letting Off / Reapplying The Accelerator
Feb 22, 2012
I've got a pretty nasty driveline clunk when going over 40mph and letting off and reapplying the accelerator. The way I'd describe it is: when I let off, it feels like something clunks forward, and when I get back on it, it feels like it clunks backwards.
So far I've had the U-joints replaced, replaced the tranny mount, greased the slip-yolk several times, and just changed the rear diff oil (and found no broken teeth or excessive wear in the gears) and it still does it.
Since I don't have a sig:
2001 Ex 4x4 7.3L PSD
5" RC Lift (but the clunking was present before the lift)
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04 explorer, When traveling under throttle the thing runs smooth, when letting off accelerator, there's a rumble from, what seems like, the rear of the vehicle, when I press the accelerator, it almost "clunks" and acts fine once it's under acceleration again. Should I suspect my rear end gears going out, or something simple like a universal joint.
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So, I'm slowly but surely eliminating a terribly shaky front end on my 2002 F-250 7.3L 4x4. First was a new carrier joint on the front drive shaft. Didn't work much, but the shop said the darn thing was falling apart. Next thing I did was new wheel bearings and manual hubs. Less vibration for sure. But the last remaining issue, in terms of vibration, is that when I let go of the Accelerator going at any speed above 60 MPH, it makes a horrible horrible noise, and I could feel a vibration. It shakes the whole truck, but I can very noticeably feel it directly in the gas pedal. It's really only an issue during deceleration. What could it be??? Drive shaft U-joints? Torque Converter? Something else in the Front End? Something in the engine even?? I don't exactly have the funds to tackle every possible solution.
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2005 ford f250 6.0 Started making this noise from front about a month ago, can't figure out what it is. Only happens when letting off accelerator or changing from P - D. The truck acts normal, seems to be louder when the truck is warm.
[URL] .....
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Our 2010 Prius jerks at speed of 15-20 mph and or when letting off the accelerator. I changed the spark plugs & filter. Also, cleaned out EGR tube, throttle body and intake manifold. thinking these might be it. These did make minor improvements, but the issue remains. No codes.
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I have a 2010 prius with about 245k miles on it. I have recently noticed slight vibrations at speed of 15-20 mph and or when letting off the accelerator. I also noticed it goes away at higher speeds. I don't feel these vibrations when on battery or when coasting down a hill. I did an oil and filter change in March. I am planning on changing the spark plugs soon. What might cause a prius to jerk or vibrate?
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I have been hearing a muffled thud or knocking noise often, especially when letting off of the accellerator when coming to a stop...almost sounds like some kind of bracket might be broken and some part is slapping against another. No particular consistency in the pattern of the sound...very strange. I had the car in for service to replace the stepper motor and the tech indicated he thought changing it would take care of it...it didn't.
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Grease the tailshaft unit, or replace the entire shaft. I'll grease it tonight, what type of grease to use?
Lexus techs charge too much for parts/labour here, so i would like to attempt to sort this out myself.
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My driveline has been vibrating for some time now. I changed out the rear u-joints with no improvement. I found the spline to be sloppy. I think I need a new driveshaft.
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I have posted several times about my 03 Ex and it's driveline vibes- mainly highway speed and when slightly on the gas... Took it to a local 4 wheel drive shop that specializes in lifts. They jacked it up and I ran the X up to highway speed with the rear in the air. It was amazing how rough it is, even at 55mph. I hardly feel it in the vehicle at that speed while driving.
Anyway, they felt the vibration but where it is coming from. They said pinion angle looked fine and since I have a retubed driveshaft and rebuilt rear, they ruled that out. The owner has an 04 with a 6 or 8" lift and 37's and seems to know about Excursions.
I then took it to the local Ford dealer and had the service manager drive it. He strongly feels it is gear mesh with the ring and pinion. I am not totally convinced as the rear is quiet, gear wise. For that matter, my slip yoke has quite a bit of torsional slop, likely as much as the backlash on the ring and pinion but the driveshaft shop said that it is acceptable.
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This squeaking/squealing noise only happens when letting off the gas after accelerating 70%+ throttle. Quickly letting off the gas after revving up makes the noise . It sounds like it comes from under the drivers side door, and does NOT sound like a turbo. Its a creaky/squeaking noise.
Wont happen in park, does happen in 2wd or 4wd, on highway or in city. [URL] ....
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I have a 2001 F250 7.3 with 175K.
Here is the situation. There is a disturbing clunk when I take my foot off the accelerator and a corresponding clunk when I push back down on the accelerator. This only occurs when the vehicle is not under load. That is, it does not happen when going up hill or on any sort of an incline. It does not happen when the automatic transmission shifts. It does not happen shifting into reverse or drive.
It does not happen when starting or stopping. It only happens when I am at 40-60, or so, miles an hour and let off the accelerator and/or press the accelerator again. It appears that I can carefully feather the accelerator to eliminate or, at least, minimize the clunk. I have crawled under the truck and it looks like all the U-joints are tight, I have lubricated the slip-yoke (although when twisted there is, like a mm of play when this is twisted, not much but a very little).
The rear-differential pinion appears to be tight (no side-to-side play or up-and-down play, or at least I can't make it move with my hands). However, when the truck is in neutral the entire driveshaft is able to rotate a half inch, or so, all the way up and down the drive train. That is, the transfer case and the rear differential appear to have a little rotational play in them, but I am guessing this is pretty normal. When in park the entire driveline seems solid.
I have seen from some of the other posts that this sort of clunking can come from leaf springs, hangers and such but since this clunk seems so isolated to acceleration changes when the vehicle is not under load, I doesn't seem like this would be the issue. No clunk when shifting, turning, bumps etc. Everything seems perfect until I am on a gentle downhill or flat and let off the accelerator. Doesn't appear to clunk when going down a steeper decline. All this gets me to thinking that the clunk is caused whenever the driveshaft rotation gets ahead of or behind the rotation in the rear differential.
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Trying to diagnose the below clunk noise as the accelerator is initially pressed?
[URL] ....
If there belt tensioner wobbles like this on a 2azfe? There is a noise as you initially press the accelerator but then disappears. You can hear it in the video. I know there is a tsb on the tensioner but the belt doesn't look like its loosening off.
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I have had my 2007 GX for 5 months now. I have discovered the "clunk" issue and had the dealership replace the driveshaft. I want to start a new thread because I have a different clunk. The new driveshaft has fixed my clunk issue at a stop but I have one more. While driving in the city or leaving the highway on the exit ramp (transmission is in overdrive) and I press the accelerator I get a clunk.
This only happens when the transmission is shifting out of overdrive. I can repeat this clunk while driving around 30-40 mph. I will coast a bit then accelerate enough that it wants to shift out of overdrive and then "clunk". It sounds loud but not much of a jerk. I have 85K on it and did not perform any fluid changes in the drive train yet. Transmission is sealed so not sure if it is worth changing or just leave it and drive nice so it don't clunk.
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i have a 04 ford excursion 6.0 with the egr delete, was stopped at a light to make a left turn, when i stepped on the accelerator pedal nothing happened as the engine was just idling. i pumped the pedal around 10 times and finally got the engine to rev up. i just got this excursion and don't know to much about the maintenance on it. i am going to drain the water and change the two fuel filters. my neighbor is familiar with diesel engines and he said to look at the throttle sensor. i have run this engine up to 900 miles and it has started and run perfectly. i believe the usual maintenance like oil changes etc were done on it. would any error codes show up even though no warning lights on the dash.
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After putting my front end back together except new springs, new shocks, and new track bar, just to give everyone a little history of what I've done to it. I've had it for 8 months and maybe put 1000 miles if that because of working out of town a lot and the front end torn apart. I've noticed a louder roar coming from the rear end when taking my foot off the accelerator without pressing the brake. It feels like the tow button is engaged, but isnt. I have no issues with handling besides knowing it still needs alignment. I'm taking it to the dealership tomorrow for a 4 wheel alignment. It sounds and feels like I'm riding on mud terrain tires.
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I have a '02 Excursion with a 7.3L PSD, 238,000 miles. When I drive and say stop at a stop sign or light, when I transfer from the brake pedal to the accelorator and initially begin moving, I hear a slight "Thump" in the back. Could it be a sticky rear brake caliper? Bad U-joint? Sloppy ring/pinion gear? Just put AMS oil in the rear diff but have noticed slight shavings on the fill plug magnet.
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On my 2003 6.0l Excursion, the 5R110 is having some issues with reverse lately. Sometimes when you put it in reverse it doesn't actually engage. The only way to make it "fall" into gear is by giving it a little fuel, which then sends it into reverse. Now here me out, I'm not hitting 3,000rpms when I do this, just a light raise in rpms will get it in gear. Solenoid issue, possibly?
I haven't noticed if it does this when it won't go into reverse or if it does it no matter what, but it will make a light clunk when going forward after using reverse. A very light, but noticeable clunk. Is this most likely a U-Joint related issue? Got under it and moved the driveshaft around, didn't notice any play at all, but perhaps I wasn't checking properly (wiggling it left and right).
Excursion is RWD (2WD) and has right around 183k miles on it, acquired in October with 172k miles, so not positive on previous history of the transmission. Also I know my gear selector mount is broke, so it cluster is off, but I certainly don't think that, in of itself, is the cause of my issues. Maybe I'm wrong?
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I've been having the loud clunk under the drivers side floor, that many others have as well. Did many hours of research and replaced the sway bar end links. Napa only had the left side in stock so I did it first last weekend and did the right side this weekend. One thing I noticed when doing the right side was the hole in the frame was all wallowed out. Drilled out the bushing in the upper end link and used a bigger bolt to fill the gap up. went for a drive and the clunk was way worse than it ever was still on the left side. So I took off the left one and went for a drive. Sure enough no clunk, the left one was wallowed out as well. So I did the same thing on that side and the evil clunk is finally gone. Just thought I would throw that out that if have a clunk after replacing the end links, Check the upper holes.
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So I installed my 4" Procomp lift, rancho shocks, extended length end links, brand new rear shackles, new steering gear and pressure & return hose and the truck still drives like complete crap...
When I was getting the front back together I couldn't align the front axle properly and the springs are leaning slightly...
Bump steer is terrible, wobbly sounding clunk from front end and she's all over the road.
Do I need an adjustable track bar? I assume the track bar is what's causing my axle to be off center... can I just unbolt it, center axle and re-bolt it?
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I did a search and most of what I found is about front end/middle body flex, not rear end "clunk" noises.
Bushings?
I'm already planning on replacing all four shocks.
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