transmission questions
Thread Starter
|
5th Wheeling
Joined: Apr 2008
Posts: 39
Likes: 0
transmission questions
Hi I have 91 f250 with the 7.3 and e40d transmission my question is what actually makes or tells it when to shift? Have had some problems with it not wanting to shift through the gears. Sometimes it works just fine and then the other it just gives me fits. Use to whenever it would do it I could just floor it then it would shift and be fine for a while and shift like it is suppose to but now it is not helping. The fipl is a couple of months old and got it at napa so it should be a good one. Thanks in advance for everyones help.
Elder User
Joined: Feb 2007
Posts: 549
Likes: 1
From: Mississippi
i agree with getting a fault code checked out. sounds like it's in "limp" mode. have a zf5 in mine, so not as familiar with the autos, but had a gasser with one and had a bad modulator that wasn't letting it shift right. i'm guessing the diesel autos have one as well, but don't know that for sure.
maybe this gives you another place to look.
speedrdr
maybe this gives you another place to look.
speedrdr
Senior User
Joined: Jul 2007
Posts: 118
Likes: 1
From: Winthrop, Minnesota
You need to get a OBD1 code reader and follow the directions exactly when pulling the codes. be sure to floor the throttle during the engine run test or you will get a false Fuel Injection Poition Lever (FIPL) code. Before you do these tests it is highly recommended that you clean all of the wire harness connections to the transmission, FIPL, Tachometer, VSS, and your brakes. A bad connection can also cause the E4OD computer (TECA) to give bad commands to the tranny and make it shift incorrectly.
Good luck.
Jim
Good luck.
Jim
Posting Guru
Joined: Oct 2005
Posts: 1,030
Likes: 0
From: Powell River B.C.
You can easliy check out the FILP sensor by measuring the voltage on the middle wire- key on - engine off, it should be at about 1.1volts at idle, and 3.8 to 4.3 at wide open throttle, and a smooth even increase or decrease as its moved from one position to the other without dead spots. Just because its new doesn't mean its good. I fully agree with getting codes checked- a lot cheaper than chnageing parts until you find what wrong.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
I'm not positive, but I think you should still have all the gears even in limp mode. Only it will shift hard into each gear.
If you are noticing it skip shift, than that could be an electrical problem, valve body problem (sticking valves) or even an internal mechanical fault. The latter is not very likely because that doesn't ususally fail intermittently, if something breaks, its broke!
If you are noticing it skip shift, than that could be an electrical problem, valve body problem (sticking valves) or even an internal mechanical fault. The latter is not very likely because that doesn't ususally fail intermittently, if something breaks, its broke!
Trending Topics
Senior User
Joined: Feb 2006
Posts: 250
Likes: 0
How many miles are on it? I had the same thing with mine and well I'm getting it rebuilt. Anyway, check the connector on the passenger side of the trans. That is the one that control the servo pack. Make sure the connector is clean as mentioned above. Check the wires to make sure they aren't burnt or bare because that is close to the exhaust. Mine were bare. To get to it yo have to remove the cover plate which has two 8mm bolts holding it on. Remove the rear one and loosen the front one and it will slip off. I'm sure you have already checked the fluid, etc. Hope this helps.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
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
Thread Starter
|
5th Wheeling
Joined: Apr 2008
Posts: 39
Likes: 0
Hi just got code scanner and tried pulling codes and can't get any. I think I have a tourque converter problem but shouldn't it throw code 62. It has 146000 miles on it and now it is not slow to shift it just when it shifts to 3rd it acts like it engages or unengages the tc because when it shifts from 1 to 2 the rpms only drop 200 to 400 but from 2to3 about 800 to 1000 then when it goes to od back to about 200 to 400. Anybody got any ideas or suggestions? Thanks alot you guys are awesome
Senior User
Joined: Jul 2007
Posts: 118
Likes: 1
From: Winthrop, Minnesota
The TECA is located on the firewall behind the driverside inner fender. It is low down on the wall and is hard to reach. If you decide to disconnect the wire harness from it, be careful not to bend or break the connector pins.
Jim
Jim
Senior User
Joined: Jul 2007
Posts: 118
Likes: 1
From: Winthrop, Minnesota
Inside the engine compartment on the fire wall you will see a long rectangular connector with a 10mm bolt going through the center of it. You have to unbolt the connector and very carefully pull it from the TECA. The actual TECA is mounted behind the driver side kickpanel next to the parking brake. If I remember correctly you have to remove the kickpanel first inorder to remove the TECA.
Jim
Jim