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Ford Expedition, Transmission, SUV
#133 of 243 Expedition Hard Downshift on Slowing
Dec 15, 2009 (3:50 pm)
I have a 2008 5.7 L (Big V8) 4 wheel drive Ford Expedition with 21,000 miles on it. In the past 4 weeks it has started having a hard downshift as you slow to a stop. It feels like it is the final shift down to 1st gear but it may be 2nd. It always happens before you stop. There not any type of surge or acceleration. I am just worried as to when the thing is going to break and how do I fix the problem. If any of you have experienced this problem please respond. Thanks in advance for your help.
#134 of 243 Re: Expedition Hard Downshift on Slowing [arrowstar]
Dec 16, 2009 (7:02 am)
The first problem is that you have the only 5.7L ever put in an Expedition. Based on the age and mileage, you are still under warranty, no?? I am no tranny pro, but I'd think more of the torque converter than the tranny.
#135 of 243 Re: Expedition Hard Downshift on Slowing [alwaysfords2]
Dec 16, 2009 (8:17 am)
Thanks for the reply and you are of course are right on the engine size. 50 years ago I would have that burnned into my brain. I built dragsters back then, But that time and extreme interest in cars has long pasted.
So you think the torque converter may be the issue. To me that sounds better than the transmission. Since the torque converters performance is very involved with the fluid in the transmission do you think changeing the fluid and filters would help the situation?
The truck is in warranty but I am always supicious of the parts changers at the dealers. I shoot 1000 yard rifle competition with 2 master auto mechanics. We end up on long drives together to the matches. They share many stories with me about the happenings in their shops. Unfortunatly they aren't Ford guys and the thing is in warranty. I will ask them about it but my son suggested I try here first. He said I might find someone who has actually fixed the same problem and maybe I have.
Please share more of your knowledge. If it is the torque converter what do you think is happening. And if you had the car and that wasn't the problem what would be your hit list of things to look at next. I want to be a smart as I can before I take it to the dealer.
#136 of 243 Re: Expedition Hard Downshift on Slowing [arrowstar]
Dec 16, 2009 (9:40 am)
There is a TSB for the hard downshift. It is TSB 082207. This will cure it. Mine was so bad it was like a sledge hammer being slammed against the frame at every stop. It will get worse if not fixed. The TSB reflashes the TCM.
DRIVELINE BUMP WHILE BRAKING - BELOW 10 MPH (16 KM/H)
This article supersedes TSB 08-4-13 to update the Issue, Service Procedure and remove the production fix date.
Some 2007-2008 Expedition vehicles may exhibit a bump feeling while braking to a stop below 10 MPH (16 Km/h). This procedure will improve the bump felt while braking to a stop.
Follow the Service Procedure steps to correct the condition.
CAUTION APPLYING THIS PROCEDURE TO UNITS THAT DO NOT EXHIBIT THE COASTDOWN BUMP MAY RESULT IN WORSE SHIFT QUALITY.
NOTE DO NOT ATTEMPT TO REPLACE THE MECHATRONIC UNIT. MECHATRONIC REPAIR/REPLACEMENT IS NOT AUTHORIZED FOR THIS ISSUE.
1. Install Integrated Diagnostic System/Portable Diagnostic Software (IDS/PDS) or equivalent and ID the vehicle.
2. Update the Power Control Module/Transmission Control Module (PCM/TCM) calibration using IDS release 57.8 and higher or 58.1 and higher. This new calibration is not included in the VCM 2008.9 DVD. Calibration files may also be obtained at the website. Since the TCM cannot be independently reprogrammed, reprogram the PCM to ensure that engine and transmission calibrations are updated to the latest level simultaneously.
a. Verify that the TCM shows 8L1P-7J104-AC (8L1P-7J104-BC for 2008 vehicles built after 12/3/2007) part number after reprogramming is complete.
b. Select the following from IDS, Tool Box, Powertrain, OBD Test Modes, Mode Level 9 Vehicle info, TCM Cal Part Number.
3. Clear TCM keep alive memory (KAM) and adaptive tables.
a. Using IDS:
(1) Open Toolbox.
(2) Choose Powertrain.
(3) Choose Reset KAM.
(4) Then Choose TCM.
b. Using PDS:
(1) Choose all Tests and Calibrations.
(2) Scroll down the menu and choose reset TCM KAM.
NOTE FOR PDS, RESET TCM KAM IS NOT THE SAME AS CLEAR TRANSMISSION ADAPTIVE TABLES, WHICH IS UNDER THE POWERTRAIN - TRANSMISSION MENU TREE.
NOTE UNHOOKING THE BATTERY WILL NOT CLEAR THE TCM KAM.
NOTE DO NOT CLEAR THE PCM KAM.
4. Verify that the transmission fluid temperature (TFT) PID is above 175 °F (80 °C). If it is not at 175 °F (80 °C), drive unit approximately 3 miles (5 Km) to reach temperature.
NOTE TFT MUST BE AT 175 °F (80 °C) OR ABOVE BEFORE PROCEEDING TO STEP 5.
5. Drive unit to perform adaptive shift strategy learn:
a. Accelerate from rest with light throttle to 15 MPH (24 Km/h), remove foot from accelerator pedal.
b. Brake very gently to a complete stop (allow at least six (6) seconds).
c. Repeat Steps (a-b) a total of five (5) times in the dealership parking lot or similar setting.
d. Accelerate from rest with light throttle ensuring that the 1-2, 2-3 and 3-4 shifts occur at engine speeds between 1300-1800 RPM.
e. Continue to accelerate until you achieve 50 MPH (80 Km/h) or the 5-6 upshift.
f. Brake gently to a complete stop and hold foot on brake for at least 10 seconds.
g. Repeat steps (e-f) three (3) times.
NOTE THE HARSH BUMP FELT WHILE BRAKING TO A STOP WILL BE IMPROVED. HOWEVER, SEVERAL DAYS OF DRIVING ARE REQUIRED FOR THE TRANSMISSION TO FULLY ADAPT.
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
082207A 2007-2008 Expedition: 1.0 Hr.
Check DTCs, Reprogram
The PCM And TCM,
Includes Time To Clear
KAM And Perform Road
Test. Authorization Decal
Not Required (Do Not Use
Dec 16, 2009 (11:59 am)
The service interval for the tranny is 30k. I don't think a premature change would hurt, but there must still be some underlying issue. It would stink to do a premature service and mask the problem only to have it fail outside of the warranty another 20k from now. It could also just be a computer issue and a reflash would correct it.
Jan 15, 2010 (2:53 pm)
I have a 2000 eb expedition every time I start from a completely stop the truck makes a very hard shift from 1st to 2nd. Any ideas?
Jan 15, 2010 (2:59 pm)
Yes - take the truck to the Ford dealer and have them reflash the transmission memory. They can do it while you wait or they did mine. It is a 2008. It fix a really hard shift problem.
#140 of 243 Transmission slips when accelerating from stop
Jan 31, 2010 (9:56 am)
I have a 2007 Expedition with 53,000 miles that I bought used so I had the transmission fluid changed. After driving for a while I noticed when taking off from a stop it accelerates slowly then the transmission grabs and acceleration increases. It feels like either the torque converter is slipping or the transmission isn't downshifting from 2nd to 1st until you accelerate away from a stop. I've seen several messages that indicate shift problems can be fixed by taking it to a dealer for a reflash. Is that the recommended solution for this problem?
#141 of 243 Re: Transmission slips when accelerating from stop [jstrong1100]
Jan 31, 2010 (10:21 am)
Ford told me that the transmissions work fine and are durable. What messes up is the communications between all of the systems in the drivetrain and the transmission. The transmission learns how you drive and adjusts it shift pattern to your style or the terrain you drive on. So if it gets confusing inputs it starts shifting strange/funny/weird.
My problem started after a serious 4 wheel experience when I unexpectedly got into off road wet conditions . I was having to clean the mud out of the tire tread by keeping the tire speed above 40 mph while going about 5 mph. There was much stopping and starting. After that the transmission jerked.
They re flashed it in a few minutes and you would think it was a new car.
#142 of 243 Re: Transmission slips when accelerating from stop [arrowstar]
Feb 01, 2010 (6:43 am)
The tranny is a 4R100 which is used in the F250. There isn't much you can do in an Expedition that even comes close to what it is designed to handle.