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Old 09-14-2002, 06:46 PM
JeffK JeffK is offline
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Sluggish Acceleration 5.4L

I just puchased my first Expy (2000 4x4 EB 5.4L) on Sept 12th, and I've noticed something wierd when accelerating.

If I take off from a stop at 3/4 or full throttle and speed up to 50-60mph, I notice the engine/driveline has a sluggish feeling. Kind of like it missing a few sparks here and there?

Has anyone else experienced or heard of this problem? I have 30 days for satisfaction warranty to return the truck for any problems I find at the dealer I purchased from.

Thanks for the help,
Jeff
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Old 09-14-2002, 07:44 PM
bronco351 bronco351 is offline
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Sluggish Acceleration 5.4L

I have a 98. 5.4L. Mine is pretty slow off the line also. My suggestion to you is to go to another dealership and test drive another expedition and see if it's the same GOOD LUCK!!!
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Old 09-14-2002, 10:31 PM
JeffK JeffK is offline
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Sluggish Acceleration 5.4L

[updated:LAST EDITED ON 14-Sep-02 AT 11:32 PM (EST)]Take-off, Idling and Cruising all seem normal. Toward higher RPMs it seems like it's having a difficult time, with a slight hesitation.
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Old 09-16-2002, 11:03 AM
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buzzard buzzard is offline
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Sluggish Acceleration 5.4L

How many miles on truck? What is outside temperature and humidity? What is your rear gear ratio? All of these can/will affect low-end performance.
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Old 09-16-2002, 07:46 PM
JeffK JeffK is offline
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Sluggish Acceleration 5.4L

[updated:LAST EDITED ON 16-Sep-02 AT 08:46 PM (EST)]49,900 Miles. 70 degrees outside with probably 50% humidity. Unsure about the gear ratio.

The more I drive and notice it, I think the engine is running fine. It almost feels more hydrauilc. Like slippage in the Transmission or Transfer Case.

This has All wheel drive selection only. Is this the way that automatic 4WD sounds?
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Old 09-16-2002, 10:03 PM
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Sluggish Acceleration 5.4L

>49,900 Miles. 70 degrees outside with probably 50% humidity.
>Unsure about the gear ratio. Mileage and temp should be ruled out, but the gear ratio could have something to do with lack of performance.

Expy Gear Ratios (look at tag inside driver door):

19—3.55 NLS
17—3.31 NLS
H9—3.55 LS
H7—3.31 LS
H6—3.73 LS


>
>The more I drive and notice it, I think the engine is
>running fine. It almost feels more hydrauilc. Like slippage
>in the Transmission or Transfer Case. Better take it into a shop.
>


>This has All wheel drive selection only. Is this the way
>that automatic 4WD sounds? It's automatic 4WD and only engages the front wheels when the rear wheels begin to slip. If it is automatically engaging the front wheels, you should hear a series of clicks and clunks. You can always engage and disengage the 4WD manually by turning the switch.

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Old 09-17-2002, 12:31 PM
peterbilt peterbilt is offline
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Sluggish Acceleration 5.4L

Your fuel injectors may need cleaning. Check your 0 to 60 times. Maybe it is OK. If your previous vehicle was smaller maybe it just seems slow.

Pete
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Old 09-25-2002, 04:24 PM
01kaw9r 01kaw9r is offline
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Sluggish Acceleration 5.4L

I know exactly what you are describing. I have a 2000 4X4 XLT with the 4R100 trans. It came with 3.55 gears which I changed to 4.10 with 285X75X16 tires. It feels like the torque converter is just spinning and not transferring the power to the trans. Then all the sudden you can feel it kick in and acceleration picks up. I think it is a combination of the electric trans, lock up torque converter, and programmed shift points being kind of mixed up because of my gear and tire changes. I also installed a Banks transcommand box to firm up the shifts. I noticed this mostly happens when I am crusing about 40 mph and then accelerate hard, and it only seems to last a second or two before you can feel the torque converter start doing its job.
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Old 09-25-2002, 04:43 PM
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Sluggish Acceleration 5.4L

Ford trucks are known to have a soft tranny shift program,
which is prob. contributing to your sense of sluggishness.



My V10 F250 was the same lethargic creature until I reprogrammed
the tranny via the Super Chips tuner - wow, what a difference.

Check the FTE store here to see what options are available
if you want to go that route (modifying the stock computer
settings, that is). Others on the forum may have some valve/hardware options to help as well. Good luck.

-- Bob

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V-10, 4:30, 6' Bed, 4x4, Auto, K&N FIPK-2, SCMT-tuned
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Old 10-17-2002, 07:43 PM
97 awd xlt blue 97 awd xlt blue is offline
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Sluggish Acceleration 5.4L

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Old 10-21-2002, 08:16 PM
KHaga KHaga is offline
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Sluggish Acceleration 5.4L

Interesting....I just bought a used 2000 Expy EB with the 5.4L/4R100 with 51K miles and I am experiencing the exact same symptoms as the other 2-3 folks above...In fact, I was searching this forum for that very reason.

My engine idles fine, and I'm getting 12-13 avg MPG around town (with a light foot), but it does feel like it is slightly mis-firing when I am accelerating in a hurry - especially when I am going up an incline of any degree and working the engine harder - in fact, I can hear a slight difference in the engine noise (it sounds like the "purr" of the engine is not quite as smooth as it should sound). When I am driving easy and letting the tranny do the work, it seems to be OK. If I am trying to give it some "go", I then notice a lack of "smoothness" in the engine, but it does kick in.

I feel it is the fuel system that needs cleaning/flushing (as someone above recommended), so that was my first plan of attack.

If anyone gets this fixed, please post the results!!

KHaga in NC
- 2000 Expedition EB, 5.4L/4R100, 4x4
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Old 10-21-2002, 08:16 PM
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