Question about 1990 Ford F250

1 Answer

Modulator possibly went bad

I think the modulator for the transmission for my 1990 ford f250 4 wheel drive is bad. How do I diagnose and replace?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Ford Master
  • 81,400 Answers

Use a Mityvac or any type of vaccum pump vaccum tester tool (avail at ay parts store) and hook it to the vacuum nipple of the vacuum modulator on the side of the trans, pump the tool to see if modualtor holds vacuum, if it doesn't it is defective.

Posted on Jun 19, 2009

Ad

1 Suggested Answer

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 there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I own a 02 foard explorer shift motor was bad i think and i removed it, i started it to relocate it, installed the new shift motor


Don's 1999 Ford Ranger shift motor PROBLEM SOLVED ...

? 13:05
https://www.youtube.com/watch?v=wcn39gwPWfI
Oct 1, 2013 - Uploaded by gtarman49
Don's 1999 Ford Ranger shift motor PROBLEM SOLVED. ...How to find replace fix 4x4 transfer case shift module 2002 Ford Explorer 4 wheel ...

How To Install Replace 4x4 Transfer Case Shift Motor Ford ...

? 9:15
https://www.youtube.com/watch?v=9ldrtZODxQ8
Oct 26, 2010 - Uploaded by 1A Auto Parts
How To Install Replace 4x4 Transfer Case Shift Motor Ford Explorer .... transfer case shift module 2002 Ford Explorer 4 wheel drive not working ...

How to find replace fix 4x4 transfer case shift module 2002 ...

? 3:07
https://www.youtube.com/watch?v=sZw3SS2Pt-4
Nov 3, 2013 - Uploaded by kirk colombo
... transfer case shift module 2002 Ford Explorer 4 wheel drivenot working ..... I replaced the transfer motor so i think it is the control module.


Jan 08, 2016 | Cars & Trucks

1 Answer

I just bought a 2003 superduty crew with a 6.0 diesel it will not go into 4 wheel drive. i have replaced the vacuume pump and the solinoid (they were bad) I have no power to the switch in the dash. i have...


What large square fuse ? The 4X4 switch get's it's B+ voltage from the four - wheel drive control module . computer controlled ! Has two relay's - transfercase hi to low & low to high ,located in the Auxiliary relay box #3 . location left side of radiator core support . Your best bet ,take it to a qualified repair shop that has a diagnostic tool that can communicate with the 4X4 control module . Read code's ! Probably has a code like one of these
P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure 4WD control module Go To Pinpoint Test D . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground 4WD control module Go To Pinpoint Test A .
But code have a few others as well .
B2105 Throttle Position Input Out of Range Low 4WD control module Go To Pinpoint Test B . B2106 Throttle Position Input Out of Range High 4WD control module Go To Pinpoint Test B . C1728 Transfer Case Unable to Transition Between 2H and 4H. 4WD control module Go To Pinpoint Test C . C1729 Transfer Case Unable to Transition Between 4WD HIGH and 4WD LOW 4WD control module Go To Pinpoint Test D . C1979 IWE Solenoid Circuit Failure 4WD control module Go To Pinpoint Test F . C1980 IWE Solenoid Short to Battery 4WD control module Go To Pinpoint Test F . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure 4WD control module Go To Pinpoint Test D . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground 4WD control module Go To Pinpoint Test A . P1824 Transmission 4-Wheel Drive Clutch Relay Circuit Failure 4WD control module Go To Pinpoint Test A . P1826 Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Battery 4WD control module Go To Pinpoint Test A . P1827 Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Ground 4WD control module Go To Pinpoint Test A . P1849 Transmission Transfer Case Contact Plate A Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1853 Transmission Transfer Case Contact Plate B Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1857 Transmission Transfer Case Contact Plate C Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1861 Transmission Transfer Case Contact Plate D Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1867 Transmission Transfer Case Contact Plate General Circuit Failure 4WD control module Go To Pinpoint Test D . P1891 Transmission Transfer Case Contact Plate Ground Return Open Circuit 4WD control module Go To Pinpoint Test D .

Nov 27, 2017 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

Ford expedition jerks in reverse, does fine in drive, but in reverse you would think the back wheels are going to fall off it jerks so bad.


to fix your vehicle you would have to have an experienced shop diagnose your compliant.It is very hard to help any other way.However I think your transmission it the problem

Jul 23, 2009 | Ford Expedition Cars & Trucks

1 Answer

Constant whine when driving and wheels lock/skid in sharp turns


One way to track down the noise; since sound travels through metal its hard to pinpoint when driving in the car.
Jack all four wheels off the ground securely (preferably a lift) and run the car with the wheels spinning. Then, without dying, listen for the noise. The dealer can do it for you as well. But sounds like a bad differential.

Mar 06, 2009 | 1990 Subaru Legacy

1 Answer

1990 ford 5.8l automatic transmission seems to shift funny


could be a faulty solenoid, scan the TCM for faults and drop the sump for contamination

Feb 07, 2009 | 1990 Ford F150

1 Answer

1990 Ford Bronco makes noise when changing gears?


sounds like you have a universal joint issue.(the joints that attach the drive shaft at the transmission and the rear axle.) You are right in not driving it as the drive shaft could fall out.However if this noise just started to occur you should be able to drive it a short distance to a mechanic and save the tow cost. I personally have driven (although carefully) for several weeks before i was able to change a universal joint. There are also some other possibilities of things it could be so I would suggest you take it to a trusted pro to have it diagnosed.
hope this helps!

Jan 19, 2009 | 1990 Ford Bronco

1 Answer

Help on the sequence of the automatic transmision ford f150 90 v8


if youve got transmission fluid in it and it wont do anything it is a bad transmission, if it isnt shifting in a correct order then your then your modulator valve is unhooked, bad, or isnt on it and you have to buy one for about twenty dollars or so i think. I cant remember if it is on the drivers side or passengers side. It looks like a spark advance. I hope that helps you out.

Nov 18, 2008 | 1990 Ford F150

Not finding what you are looking for?
1990 Ford F250 Logo

Related Topics:

246 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

Marvin
Marvin

Level 3 Expert

81342 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

gerry bissi

Level 3 Expert

4376 Answers

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

Answer questions

Manuals & User Guides

Loading...