Tip & How-To about Ford Crown Victoria

Disconnect or Replace Battery on Ford Motor Cars and Trucks

Disconnecting or replacing your battery can lead to erratic behavior in the performance, idle, and other related drive-ability issues. Ford did not incorporate the( PROM) Program Read Only Memory in its computer.

That said Fords Failure Effects Management (FMEM) states in order for the computer to relearn its systems of inputs and outputs you must use this procedure for the vehicle's computer to re-learn its systems by using adaptive learning techniques.

FMEM Procedure:
-First, start the engine allow it to warm up to normal operating temperature.

- Raise RPMs to 2000 and hold it for two minutes. (needed for to heat up the oxygen (02) sensors).

-Then if you have a/c turn it on and allow to run for 5 minutes.

-Continue on with depressing the brake pedal once and let go - for those who have cruise control (this is for the BOO Switch- Brake On/ Brake Off Switch).

-In addition, turn the steering wheel half way one direction to the other direction and leave it there.

-Finally, drive the vehicle for 5 miles.

Customers have complained about rough idle, car cuts out when they make a turn, turn on a/c and car's idle is low and cuts out. For those of you who are computer literate when you format your hard drive the drive is wiped out- clean- of everything; then you install an operating system. Well, the car's computer is kept alive by the battery; when power is interrupted so is its memory. Battery Maintainer will save you headaches down the line

Note: GM does not have this problem because GM incorporates the PROM in its computers.

  • To help you save radio presets, clock settings, and computer memory codes, and will not have to worry about re calibrating sensors, and have to get a Radio Code from the dealership.
Click this link today to get yours Tools For Sale Cheap Auto Repair Help US
Thank you, and Happy Motoring, Lee Davidian, Sr.

Posted by on

Cars & Trucks Logo

Related Topics:

Related Questions:

1 Answer

i recently went to start my truck and the idle was very erratic and after checking for any visible vacuum leaks and finding none tried to drive it home. The engine lacked power and would rev very high

unless you have the codes read to find which sensors are not working then you will be just wasting money chasing your tail. Have the codes read and that will indicate where the problem/s lie.

Sep 01, 2014 | 1986 Ford Bronco II

1 Answer

alternator ford aerostar

To remove the lead from the battery to the alternator while it is running is to invite a destroyed alternator . Varying voltages with engine RPM is indicative of a bad battery or problem alternator regulator . Have a load test done on the battery to check for cell problems and have the alternator bench tested to check the performance .

Feb 24, 2014 | Cars & Trucks

1 Answer

self adjusting 4.9i computer in ford f150

The computer doesn't self adjust or relearn in that way. That is beyond its limits. Relearning has to do with tiny amounts of difference in fuel trim for the injectors. Idle is more controlled by the idle control motor or valve.

Sep 27, 2012 | 1989 Ford F 150

Not finding what you are looking for?

2,555 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

85222 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

gerry bissi

Level 3 Expert

4388 Answers

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

Answer questions