Ford Techs Stumped On This One! HELP!!
Senior User
Joined: May 2009
Posts: 311
Likes: 1
From: Clearwater
I hope they went so far as to replace the external filter as well as blow the cooler and lines when they replaced the trans. If you shift from reverse to forward and push the accelerator does the engine rev up quickly without the truck moving? If so it is still driveline related and not the engine or engine electronics.
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
well egr can cause percived transmission issues becasue flow at incorrect times or incorrect amounts can casue a laps in throttle responce.
just like an engauged vdf can make you think the trans is slipping when in fact its not.
egrvp = egr valve volt position.
egrdc# = egr valve duty cycle
now back to the fan thing you would need to know fanvar# , fanss and rpm to see if you have a vdf issue.
fanvar# = van duty cycle
fanss = fan speed rpm
rpm = engine rpm
vdf = viscouis drive fan
have you by chnace look at the amount of drive line wind up aswell. this would be transfer case chain play and rear drive shaft, drive shaft splines and rear diff backlash
not tring to confuse you just give you direction and places to look.
just like an engauged vdf can make you think the trans is slipping when in fact its not.
egrvp = egr valve volt position.
egrdc# = egr valve duty cycle
now back to the fan thing you would need to know fanvar# , fanss and rpm to see if you have a vdf issue.
fanvar# = van duty cycle
fanss = fan speed rpm
rpm = engine rpm
vdf = viscouis drive fan
have you by chnace look at the amount of drive line wind up aswell. this would be transfer case chain play and rear drive shaft, drive shaft splines and rear diff backlash
not tring to confuse you just give you direction and places to look.
Thread Starter
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New User
Joined: Feb 2009
Posts: 21
Likes: 0
Lets just say this, cuz it's hard to explain. Just backed up, shifted into drive, whether rolling or not, depress slightly on accelerator and there's NO response from engine or trans, does not throttle up or start moving until a point just past slightly depressing the pedal is reached then it lunges forward. There is a slight clunking sound when it finally engages also but I think that is the slip yoke.
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
my trans knowledge is somewhat limited... i have built only a few 5r100 units and oly because I had to not by choice. I am not to bad on the engine end though. As such I really cant give much more advise other then input of a few things to check and the basic knowen concerns the pc-a and what else I have seen.
New User
Joined: Feb 2010
Posts: 2
Likes: 0
I have a 2003 started with the same problem. Now I also have an issue with the tranny showing hot when first started even before driving. In the shop now hope they can let me know something soon. If it is pertinent information I will pass it on as soon as I have it.
New User
Joined: Nov 2009
Posts: 1
Likes: 0
Had a similar problem with my 7.3l 4R100 after the tranny overheated.Turned out to be the lockup clutch in the converter.Does your truck ever stall.Mine did it mainely from reverse to drive and more often when towing or under load on hills
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Fleet Owner
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Here is a thread that is pretty informative (w/ pics and schematics).
http://www.thedieselgarage.com/forum...coast+Solenoid
http://www.thedieselgarage.com/forum...coast+Solenoid