05-03-2013, 08:57 AM
Join Date: Apr 2012
Location: East Texas
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Bucking, jerking or shutter after TC lock up part throttle.
Title says it all and this seems to be a common issue some of us are having and although there is a lot of talk about the symptoms and recomendations to solve them I've found no one who posted their sulution. Am i wrong? So here I go with where I am on my issues and what I'm about to try. Would like your input as to anything else I should do while there. Dont like spending money on things that aren't broke but hate having to go back to fix somthing else when you were right there even more.
Quick run down, March of 12 bought the 06 FX4 CC and noticed the bucking first morning day after purchase, returned to dealer and we came to a monetary agreement so I keep the truck. This winter it became much worse.
Symptoms have been discribed many times in these threads but heres my take. A jerking of the drive line felt right after TC lock up at part throttle more noticed when cold. Did it stock, tried SCT tune from MKM with trans the main abjective, pulled EGR, have ran every test a Pegisys diagnostic scanner will run. ie injectors, duty cycles, lock up, pressures and voltages. Only code ever read was P098 IAT S2 V high (I think). Replaced the sensor and noticed it started just a tad faster when hot. Flushed trans and changed both filters. Checked ujoints, pulled rear deferential cover and checked gear teeth and late one night boiled the hell out of the zeons in frustration. Just replaced those two by the way and wont be doing that again. ouch
All temps in Fahrenheit, all speeds MPH, UL = unloaded
UL When temps in the 20s I cant find any other way to get it to stop bucking but cover the trans cooler tank end of the radiator fins with plastic or card board. Trans temps then will get close to normal.
UL When temps below 40 and not pluged in no matter how much idle time its almost best discribed as violent (when this bad you can feel it a bit with out the TC locked up) and just depends on how or if you can get the trans temp up. I've become good at the plastic trick.
UL When pluged in on block warmer temps above 40 with 2-3 mins of ideal time and 1 1/2 miles to FM road from house where the TC locks up I experiance a slight bucking and last like that all day as long as you dont kill it. No plastic
UL When temp 50 to 60 and fluid temps normal driving 70 mph or less it will go away completly after fluids are warmed up.
When loaded 10,000 Lb at temps around 30 and working the truck there is some jerking but gos away after a few miles and when temps above 50 and working the truck never felt. A lot less time spent with the TC locked up though.
Anyway I called in a favor yesterday and had a classic car buddy of mine have a Trans shop owner call me. After the above run down he asked a couple of questions one being had i ever felt slipage, answer was no. Maybe a bit firm when easing into the throttle but never sliping, burnt smell was his second and answer was no. After informing me that more than once he has worked on one that had a new solenoid or three and it was the wiring harness in the pan that connects to the solenoids. He would not rule out the solenoids or valve body though with out inspection as he has seen issues with them also.
Any advise or questions before I replace the wiring harness to the solinoids and pressure swicths would be greatly appreciated? And can any one confirm the part number D16446 as the correct harness.
Last edited by KLT1969; 05-03-2013 at 11:33 AM.