20 Most Recent 1991 Ford F150 - Page 2 Questions & Answers

Did you also change the Coolant Temperature Sensor? If it is reading wrong, the computer may not realize the engine is cold, and won't increase the gas for that. Spray some carb cleaner around the outside of the throttle shaft, if engine speed increases, that could be a vacuum leak. I've never heard of that, but anything is possible. It sounds like it would have to be a serious air or vacuum leak to cause your problem. Have you blocked off the power brake booster to check if that is leaking? You might want to do a compression test to see if there is any internal mechanical damage.

Sounds like the connection broke at the throttle at the intake. Take a look to see if the clip broke. don-ohio

You need to figure out what the engine looses when it dies. If it looses spark at the plugs I suggest looking to the ignition module, and if it looses fuel I would look at the fuel pump or the relay. It could also bee a poor ground loosing connection when it heats up too though.

You have the key cylinder drive gear timing wrong, remove it and reset the little gears.

Check your battery voltage first then check your connections tightness and corrosion

take off the battery cables and wait a couple of minutes then put them back on this will clear all the codes after this if you are still getting a check engine light go to auto zone and get it scanned for free to find out what's wrong

It sounds like you need to replace the ignition starter switch, the symptom you have is an exact fit, most models of Ford where recalled years ago for this problem.. The starter switch is at the base of the steering column under the dash and operated by a rod from the ignition key tumbler. Very cheap and easy to replace.

Hi Mark The starter is grounded at the block there is no separate ground wire. Unless I am misunderstanding your question.