E40D upshifts before it should
Thread Starter
|
New User
Joined: Nov 2006
Posts: 23
Likes: 0
E40D upshifts before it should
Two days ago I noticed that shortly after I take off from a stop, my engine bogs down. figured out that the transmission is shifting into the next gear before it should. the only thing i did before this started happening was change the alternator. when I was removing said alternator, I caused an arc from the hot leg of the alternator to chassis ground. Would this cause the computer to do something weird like this shifting problem and can I reset it by unhooking the battery for a few minutes? I also noticed that the trans fluid was low after the truck was warmed up so i added fluid to the proper level. (1 full quart)
Posting Guru
Joined: Aug 2005
Posts: 1,036
Likes: 1
From: NE Ga
You can try reseting the comp just to rule it out. The only way you'll ever know if the comp is bad or not, if the prob continues, is to swap comps. If you were just one qt low then you didn't hurt anything by that. Always always always pull the - before doing anything electrical. I smoked my whole harness from the alternator to the regulator when i tried doing a "quicky" regulator swap. Learned my lesson needless to say.
Thread Starter
|
New User
Joined: Nov 2006
Posts: 23
Likes: 0
is there anything else that could cause this problem? maybe a bad sensor somewhere? it has also been very wet here the last few days. maybe I got something underneath too wet. there were some pretty big puddles out there.
Posting Guru
Joined: Aug 2005
Posts: 1,036
Likes: 1
From: NE Ga
I don't think so. If it were that easy to corrupt a tranny, then you'd be hearing of alot more cases of moist tranny problems. Check your vacuum line/s going down to the modulator valve on the tranny body. Could be coicidental that one broke or is now leaking. I'm more familiar with C6 trannys but have changed out many E40D's. I'm not sure if this is possible or not but if your speed sensor is going wack even though you're gettin the proper speedometer reading, it could be sending bad signals to the comp causing it to upshift sooner than it should. Unlikely and I'm not sure if possible.
Posting Guru
Joined: Jul 2003
Posts: 2,210
Likes: 2
Originally Posted by 73F100*8Mile
Check your vacuum line/s going down to the modulator valve on the tranny body.
Originally Posted by 73F100*8Mile
I'm not sure if this is possible or not but if your speed sensor is going wack even though you're gettin the proper speedometer reading, it could be sending bad signals to the comp causing it to upshift sooner than it should.
Thread Starter
|
New User
Joined: Nov 2006
Posts: 23
Likes: 0
Thanks for the insight. I disconnected the battery for a couple of hours.(forgot to go back out and hook it up). Problem has not reared it's ugly head since the computer reset so I am crossing my fingers hoping that it will not return. Thanks again for the help.
Thread Starter
|
New User
Joined: Nov 2006
Posts: 23
Likes: 0
problem has returned. it goes away after the trans is warmed up. (a couple of miles) could it be the throttle position snesor or the throttle position valve? I had the tranny flushed and the filter replaced yesterday but the problem is still there. this thing is 11 years old. I can't be the first one to ever have this problem. has anyone ever heard of this happening before?
Trending Topics
Thread Starter
|
New User
Joined: Nov 2006
Posts: 23
Likes: 0
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Posting Guru
Joined: Jan 2006
Posts: 1,101
Likes: 2
From: Malvern, Ohio
well 1 - 2 shift generally is 12 - 16 mph under regular throttle, 2 - 3 is around 24 - 28 im pretty sure. If its shifts sooner you want to look at everything tied in to the tranmission because you don't know what happened when you caused an arch. Just check what you can man. good luck
