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2004 Ford expedition has started to hesitate at low speed (20to35).starts and idles fine and runs better at higher speed..

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  • Ford Master
  • 451 Answers

One or more of your cips(coil in plugs) have gone bad. Go have your code check read at autozone. It should tell you which cip is bad

Posted on May 03, 2015

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6ya6ya
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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: Low idle and hesitation when driving

i had a similar problem, with a different car though, and it turned out that the seals in the fuel pumps had been eaten away by the ethanol in the fuel i was using. i had the fuel pumps replaced as well as the filter and switched to a different fuel that contained no ethanol and i haven't had a problem since.

Posted on Jan 29, 2009

  • 1 Answer

SOURCE: 2004 nissan armada low idle then won't start

I had the smae problem with mine last week, it turned out to be the IPDM Independent power distribution moduel, looks like a big fuse box. I would take it to a side mechanic and have them fix it instead of going to the dealer it took like 45 mins to take the old one out and put the new one in. If you go to the dealer they are sure to charge something crazy. Hope that works for you.

Posted on Feb 25, 2009

  • 4369 Answers

SOURCE: 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.
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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.

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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.

Posted on Jun 01, 2009

emissionwiz
  • 75051 Answers

SOURCE: The engine boggs down at high rpm. For instance,

if the fuel filter hasn't been changed do so, if the fuel filter is ok and has been changed out due to this problem you will need to monitor the fuel pressure under a load and make sure it doesn't drop below 45 PSI, it it does you will need to replace the fuel pump and the fuel filter. U also do say if you have a check engine light or have had the system tested for trouble codes that may be triggered by this loss of power problem.

Posted on Sep 08, 2009

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CHECK THE FUEL FILTER!! Changed the fuel filter and thing runs fine!!

PS mine 2003 expedition has 105k

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