jerking / lunging at constant speeds or slight acceleration/decelaration - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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  #26  
Old 01-21-2011
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Quote:
Originally Posted by ponyolson View Post
ford makes a kit that is like a band aid. it is in the slip joint in the drive shaft going to the rear diff. i had the same problem and i put the kit in. now it doesnt do it anymore.
Let's hear more about this, neve heard of anything like it.
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  #27  
Old 01-22-2011
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LOST THE TRANSMISSION THIS MORNING ON THE WAY TO WORK, SINRONISORS ARE GONE... was doing 80mph on interstate, started decelerating... wouldn't come out of 5th gear. Finally got her out, coasted to an exit, got stopped and turned truck off. Got her into first, started and drover about .5 miles for her to start grinding. Shut it down again. Then said F*** it and DROVE TO NEAREST PARKING LOT.

Boyfriend drove it back to our place. PARKED UNTIL I FIND A TRANS. Nearest ones that are used are looking like $600 or more with low miles.

REALLY STARTING TO DISLIKE MY FORD....

EVERYONE CHECK YOUR TRANSMISSIONS IF YOU HAVE A MANUAL......
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  #28  
Old 01-22-2011
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MAKE SURE IF YOUR HAVING PROBLEMS GETTING INTO 1ST and 3RD and you just changed your trans fluid, check the level and what fluid you used. Only suppost to use Mercon regular, not anything else. If you did use Mercon 5, don't go back to reg mercon. Mine fried bc of trans fluid i think.
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  #29  
Old 01-22-2011
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Just found this on the other forum. Clean up this ground really good(located on the rad. support in front of the battery). Didn't do it myself yet, but it's another easy thing to try.

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  #30  
Old 01-22-2011
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The slip dif in the rear drive shaft did mess up in mine a while back. The cap that keeps the grease from going further into the driveshaft broke off. I regreased at 100,000 miles. Maybe once i pull everything this Thursday and Friday i will take a look at the driveshaft also.
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  #31  
Old 01-22-2011
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My 05 with automatic does this as well. It's not a good feeling. Drove 2 hundred miles today with cruise on most of the time and dont recall it happening at all,P.S. was about 2 degrees to 17 degrees today. Will look at the rear drive shaft (interesting Ford does not recognize this and fix correctly)
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  #32  
Old 01-25-2011
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Went back online to nhtsa.gov to purchase the tab information on the pcm problem and miss buck jerk while driving... they wanted $45 per hour to research then .10 cents per copy and they had to mail to you! What a rip off! Going to see a friend of mine and get the breakdown on it... will update once I get info.

Will be starting new thread about transmission will post link on here once I get it started
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  #33  
Old 01-25-2011
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Went back online to nhtsa.gov to purchase the tab information on the pcm problem and miss buck jerk while driving... they wanted $45 per hour to research then .10 cents per copy and they had to mail to you! What a rip off! Going to see a friend of mine and get the breakdown on it... will update once I get info.

Will be starting new thread about transmission will post link on here once I get it started
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  #34  
Old 06-09-2011
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Anyone been able to figure anything out with this? I've got a 2004 FX4 II w/ auto 4.10 gears that does this as well. Seems to only happen when its in 4th gear around 2000rpm (~40mph). Cruise on or off doesn't matter.
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  #35  
Old 06-11-2011
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I'm about to figure it out this week when it gets traded in. Mine did get better when I switched my plugs back to motorcraft from the autolites. Now I want to redo the plug wires also.
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  #36  
Old 06-12-2011
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You guys are starting to scare me. I have an 02 FX4, 5-speed, 88K and HAVE NOT had this problem, YET.

I hope and pray that I never do but if it ever arises I hope there is a fix for it.
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  #37  
Old 06-12-2011
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Quote:
Originally Posted by Decaff2007 View Post
You guys are starting to scare me. I have an 02 FX4, 5-speed, 88K and HAVE NOT had this problem, YET.

I hope and pray that I never do but if it ever arises I hope there is a fix for it.
As far as I can tell it's more annoying than scary. Mine's not bad at all, just a little hiccup once and a while around 2000RPM in 4th gear (around 40mph). I'll go weeks without noticing it.

Maybe I'll give the ignition stuff a try. That sounds like the most likely cause. New coil, wires, and plugs....
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  #38  
Old 06-12-2011
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I just had ranger come into work with this issue. I did the pcm update and re synced the ckp and the cam. Fixed this one
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  #39  
Old 06-12-2011
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And for the brakes locking up apply some silicone rtv behind the backing plate. Behind the wheel cyl. Adjuster hole and Nd place u think moister will get in.
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  #40  
Old 06-15-2011
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I have a late '99 with the EXACT SAME PROBLEM ... interested in finding out what the issue is ... this thread has been "cold" since January ... anyone find anything?
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  #41  
Old 01-03-2014
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Truck bucks when it snows

Hey I have been trying to figure this thing out for a while I've replaced the plugs and wires cause it was also doing it when it would rain and that has since stopped but now it does it only when it snows anyone have any exp. with this
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  #42  
Old 01-03-2014
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I am currently experiencing something very similar. No idea what it is
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  #43  
Old 02-16-2016
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Jerking/bucking

I have a 1994 Ford ranger that I bought two weeks ago . The intake gaskets had a leak where the oil pan had gas in it . I fixed that problem . Now I got a problem with it jerking and bucking it's unbearable . So I have replaced the plugs and wires, coil pack, fuel pump,fuel filter,crankshaft position sensor. But I still have a problem. When you let it sit for a few hrs it runs fine and after awhile it starts jerking and bucking as it isn't getting g fuel or spark IDK what it is . It's a five speed with a 4.0L what else could it be
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  #44  
Old 07-14-2016
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I have a 98 4.0 Ranger with this exact same problem. Bucking at highway speeds. Everything is fine in the lower gears and she purrs like a kitten except for this. I am not a mechanic, but did try swapping the air filter with a motorcraft with no luck. i dont have the cash or time to try all these smaller potential fixes that appear to have mixed results on multiple forums... I have found that Ford Service Bulletin #05-22-12 calls for replacement of the Camshaft Synchronizer Assembly for this exact problem. http://repairpal.com/engine-buckmisf...ay-speeds-934# I will be taking this into my mechanic for diagnosis and pointing him to what ive found about the synchronizer assembly. It looks like the engine must be taken apart for this fix and that is way beyond me.

Last edited by Starstruck Wanderer; 07-14-2016 at 10:45 AM.
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  #45  
Old 03-07-2017
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jerking / lunging at constant speeds or slight acceleration/decelaration

I had the same problem. It would start to buck at 40mph when there were snowflakes in the air and would be fine in normal conditions.
After replacing the plugs,wires, and trany filter stilll no luck.
So instead of listening to the mechanics who I asked could it be an air problem i threw the last hail mary.....I changed the air filter...problem solved. It didn't look very dirty,but I guess when you add snowflakes in the mix it was just enough to give the hesitaton...spent 800 bucks just to find out it was a $5 air filter
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