1985 f150 engine help?

Question

Does anyone know why my truck runs on after i have removed the key. I have to put it in gear and pop the clutch to stop it and I feel thats really hurting the engine. Does any one know why this is happening, and what i ca do to stop it?


PLZ HELP

The engine is not running full power it just chugging along , and it only happen when its hot

Answer 1

jumped time bad computer signal, bad connection on distibuter, bad distributor computer, the little box on the distributor, or timing chain, if it rattles alot running on low power and eats gas then all the cylinders are not hitting at the same time, so even if the distirbutor stops turning to fire plugs you are still burning gas in the cylinders so as the crank turns they still ignite from fuel still there, intake problems water leaks into the cylinders all can cause it to one degree or the other bad spark plugs wires isnt a sig for this they just dont fire, ok.
if you have severe rattles and low power sounding like the valve cover has dice in them, expect a timing chain, if it goes on this way youu will ruin valves,lifters and rockers by running it this way no matter what the cause, because all isnt turning with the rest and they will give out frm undue stress without doubt, ok

Answer 2

It's called dieseling...

Dieseling or engine run-on is a condition which can occur in spark plug gasoline powered internal combustion engines whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark.

Dieseling is so-named because it is similar in appearance to how diesel engines operate, by firing without a spark. However the ignition source in a diesel is the compression of the gas in the cylinder, while in the dieseling phenomenon the compression ratio is not sufficient to ignite the fuel and it is a hot spot inside the cylinder which starts combustion.

An automobile engine that is dieseling will typically sputter then gradually stop rather than continue running as if the engine was not switched off at all — the latter would usually indicate an electrical fault.

Dieseling is not nearly as common as it once was because it can only occur in carburetted engines. The vast majority of American, European, and Japanese vehicles manufactured after 1990 are fuel-injected-- the injectors and high-pressure fuel pump immediately cease supplying fuel to the cylinders when the ignition is switched off. No fuel is available for dieseling even if other pre-conditions are met.
http://en.wikipedia.org/wiki/Dieseling

ADDED:
Lower your idle speed a little.

Potential causes
This condition can occur for a multitude of reasons:

Built-up carbon in the ignition chamber can glow red after the engine is off, providing a mechanism for sparking unburnt fuel. Such a thing can happen when the engine runs very rich, depositing unspent fuel and particles on the pistons and valves. Similarly, non-smooth metal regions within the piston chamber can cause this same problem, since they can glow red. It has also been suggested that an improperly rated spark plug can retain heat and cause the same problem.
A carburetor that does not close entirely can contribute to running once the engine is off, since the extra fuel and oxygen mixture can combust easily in the warm piston chamber. Similarly, hot vaporized oil gases from the engine crankcase can provide ample fuel for dieseling.
Incorrect timing.
An engine that runs too hot or too lean may produce an environment conducive to allowing unspent fuel to combust.
An idle speed that is too fast can leave the engine with too much angular momentum upon shutdown, raising the chances that the engine can turnover and combust more fuel and lock itself into a cycle of continuous running.

Answer 3

Without knowing any more specifics, I would say it is the ignition switch. Not the one with the key in it, the one under the dash on top of the steering column.

Answer 4

Your ignition switch or ignition wiring has a problem. Take it to a mechanic who can check it out for you>

Answer 5

Mr knowitall said it all, ive had to deal with prob before..