Question about 1998 Ford Expedition

1 Answer

1998 Expedition 4AWD engaugeing at low speed

I have a 1998 Ford Expedition that just had the shift motot and 2 hall effect speed sensors replace by a local FORD dealer. Now when the truck is in 4AWD mode, the 4WD engauges at a speed between 2 and 8 MPH when turning. It never did that before, but the dealer says that is normal. What concerns me is that when the $WD engauges, it feels like it is engaugeing at the front wheels, not at the transfer case. And when it engauges, it does so very hard. So hard that the whole front end shutters. Where should I start looking as far a s a fix.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Ford Master
  • 2,011 Answers

Go back and talk to the service manager. If he wont do anything go to his higher up.

Posted on May 06, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 3 Answers

SOURCE: Transmission won't shift properly (2 wd ) speedo does not work

Its weird but I had a fuse blow out awhile back that is the same fuse that works the cab lights when you open the doors. When this fuse went out it also made it shift odd and hard when it did shift. Since it is only intermittent in your case, It may just be a weak fuse.

Posted on Aug 28, 2008

  • 74 Answers

SOURCE: ford explorer 1998 2 door transfercase problem

did you put it in nuetral then switch it, wait a few seconds then put in reverse and back up a couple of feet and nuetral again, i had to do this on my explorer sometimes.

Posted on Sep 22, 2008

  • 245 Answers

SOURCE: when should you replace the speed control sensor

it is not a speed control sensor it is a speed sensor. it needs replacing when it fails. the problems to look for from it failing would be intermittent or no speedometer or cruise control kicking in and out. these sensors do not fail very often they are just a prox switch picking up metal tabs on a ring as they pass by the end of the sensor

Posted on May 02, 2009

  • 41 Answers

SOURCE: starter engauges turnes slowly. new starter batt neg and poss cab

First you should check the ground cable and ensure good contact. Second make sure the battery is fuly charged (over night is best on a slow charger). It looked like you said a new battery so a good charge should fix it if it is the problem. I assume you have good connections on the parts you already changed. It is probably a bad starter (motor). You can remove it and have it tested. If it is good you might have an internal engine problem. Try turning the crankshaft. It should turn by pulling on the drive belts. Well it sounds like a bad starter.

Posted on Aug 04, 2009

  • 29 Answers

SOURCE: 2005 Ford F150, 5.4L V8, 4x4; The transfer case

Encoder motor located on the transfer case is usually the problem. It is the motor that shifts the transfer case.

Posted on Sep 28, 2009

Testimonial: "Will look into this and report .Thanks so much"

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2006 Chevrolet Trailblazer I6 suddenly began overheating at idle. Parts replaced within the last 2 months: Fan clutch, Tstat, radiator, radiator cap


How about the water pump ? Who replaced the parts ? A qualified repair shop ? Were codes checked ?
The PCM controls the electro-viscous fan clutch engagement. The PCM regulates a 12-volt pulse width modulated signal (PWM) to the cooling fan relay. The PWM signal determines the ON time of the relay. As the commanded state of the fan clutch increases, so does the ON time of the relay. This ON time directly effects the amount of time the solenoid, which is internal to the fan clutch, is energized. When the solenoid in the fan clutch is energized, it opens the spring loaded valve and allows fluid to flow from the storage chamber to the fluid coupling of the cooling fan clutch, increasing the fan speed. When the solenoid is de-energized, the spring loaded valve closes, and blocks the path of the fluid to the fluid coupling of the fan clutch, reducing fan speed.
The fan has the ability to create a feedback signal, so the PCM has an actual fan speed input. This is done with a hall effect sensor internal to the fan clutch. The PCM supplies a 5-volt reference and a low reference to the hall effect sensor. The hall effect sensor returns a signal pulse through the cooling fan speed signal circuit in response to the relucktor track passing by the magnetic field of the hall effect sensor.
Was electrical tested before fan clutch was replaced !

Sep 29, 2016 | 2006 Chevrolet Trailblazer

1 Answer

Where and how do i replace the vss on a 2002 lincoln Ls


the vss is a variable reluctance or hall effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. if the vehicle is moving at a relatively low velocity , the sensor produces a signal with a low frequency. as the vehicle velocity increases,the sensor generate a signal with a higher frequency. the powertrain control module uses the frequency signal generated by the vss (and other inputs) to control such parameters as fuel injection, ignition control, transmission shifting and torgue converter clutch scheduling

Sep 14, 2013 | Lincoln Cars & Trucks

1 Answer

I have a 2006 expedition the transmission will at very light throttle will shift 1st,2nd,3rd,& 4th with in 20 mph. All the setting like input & out put sensors are read correct. Mass Air flow


Is the transfer case in High or Low range? If there are no codes present I would almost suspect that the transfer case is in Low range, because of those shift speeds.

May 18, 2013 | 2006 Ford Expedition

1 Answer

Cannot find vehicle speed sensor. Location on tailshaft housing has a factory installed plate covering it. Also,cannot find wire loom or connector for it. What the?


E150?

Vehicle Speed Sensor The Vehicle Speed Sensor (VSS) (Figure 36) is a variable reluctance or Hall effect type sensor that generates waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition timing, transmission/transaxle shift scheduling and torque converter clutch scheduling.

a20893a.gif
Typical VSS

Yours is mounted on the rear axle at the differential (pig).

wires are:

Red/Pink

LG/BK

Aug 03, 2011 | 1996 Ford Econoline

1 Answer

1997 expedition PO503 code, 4WD, 4.6 motor, changed coil pack and spark plug


The code is specific to the engine speed sensor located on the side of the transmission near the output shaft. This device measures the output shaft rotation speed and allows the Electronic Control Unit (ECU - power control module) to program gear shifts as well as when to engage anti lock braking or traction control (by monitoring the output shaft speed sensor and comparing this with inputs from the wheel hub sensors). Locate the speed sensor connection and make sure the all the electrical contacts are free of dirt and corrosion. Remove the speed sensor and make sure that it looks physically OK and is clean, especially its tip. Check that all the wires are intact and that there is electrical continuity back to the ECU. The error code is consistent with an intermittent connection but if you suspect that the sensor itself is at fault it is not a very expensive item to replace.

Nov 25, 2010 | 1998 Ford Expedition

1 Answer

ABS Light/ Speedo erratic/ Low Speed Tranny Slippage


ABS should not effect the speed of the car or truck only if your car has traction control this will effect speed by slowing the motor down. And also will effect your trans on shifting.

Jul 02, 2009 | 1991 Ford Econoline

1 Answer

Broken speedometer on 1997 ford explorer


does your cruise control work? If not, check the wiring from the VSS to the speedo cluster. Check VSS connector closely for pin pudhout or corrosion

Sometimes, the VSS siganl is converted by the instrument cluster and sent to the PCM and speedo.

Check engine light on?


Speedometer
The electronic speedometer (17255) receives a speed signal from the vehicle speed sensor (VSS) (9E731). This sensor is also used to sense vehicle speed for the engine management system and to regulate the cruise control when equipped.
----------------------------------------------------------------------------------
Vehicle Speed Sensor The Vehicle Speed Sensor (VSS) (Figure 53) is a variable reluctance or Hall-effect type sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

May 12, 2009 | 1997 Ford Escort

3 Answers

1999 ford expedition - transmission slip?


the flashing O/D light usually means you have a bad speed sensor that sends speed info to the engine & trans computer.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.
-------------------------------------------------------------------
Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

-------------------------------------------
Some trans use an OSS, Output Shaft Sensor instead of a VSS. Depends on which trans you have, 4R100 or 4R70W

Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module (PCM) to allow automatic shifts from first through fourth gears or first through third gears only. The PCM energizes the transmission control indicator lamp (TCIL) when the switch is off.

The TCIL indicates overdrive cancel mode activated (lamp on) and electronic pressure control (EPC) circuit shorted (lamp flashing) or monitored sensor failure.

Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear, that sends a signal to the powertrain control module (PCM) to indicate transmission output shaft speed. The OSS is used for torque converter clutch control, shift scheduling and to determine electronic pressure control.

Apr 18, 2009 | 1998 Ford Expedition

1 Answer

Speed sensor on 2000 ford f150 4x4 triton 4.6


if this helps, please rate as fixya. thanks.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 43) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.


66290d2.gif
For the 4R70W trans vehicles

Vehicle Speed Sensor (VSS)

The vehicle speed sensor (VSS) is model dependent. Possible sources of vehicle speed input are, anti-lock brake sensor (ABS), a gear-driven vehicle speed sensor (VSS), or the transmission output shaft speed (OSS) sensor. On 4x4 applications with a manual shift transfer case, the transfer case speed sensor is the source of vehicle speed. The VSS signal is either an AC signal whose frequency changes with vehicle speed, or an SCP data message depending on the source. Some vehicles have both. The vehicle speed signal is an input to various vehicle sub-systems such as the powertrain control module (PCM), instrument cluster (speedometer and odometer), speed control systems, etc. The vehicle speed source must be operational to enter output state control mode for diagnostics.

If you have a 4R100 trans, it is different.

Mar 12, 2009 | 2000 Ford F150 Flareside SuperCab

Not finding what you are looking for?
1998 Ford Expedition Logo

Related Topics:

62 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

75817 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

fordexpert

Level 3 Expert

5495 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...