I have a 1969 lincoln Mark III that is in overall excellent condition. However, when i try to turn it off, it continues to run (erratically). Is this a case of bad fuel, a dirty carb. or something more?
2006-12-12 08:34:23 · 11 answers · asked by gaetawhidbey 1 in Cars & Transportation ➔ Car Makes ➔ Lincoln
Carbon deposits on the cylinder head can heat up, igniting fuel, causing a dieseling effect after the ignition is turned off,
Clean cylinder heads, check timing to get a better burn of fuel
2006-12-12 09:16:04 · answer #1 · answered by Anonymous · 1⤊ 0⤋
There should be a "shut down" solenoid on the carb in those years. Is a small solenoid that actuats off the accelerator arm on the carb. When the ignition is turned off it closes the carb off completely cutting off all fuel. They started doing that when the vehicles started dieseling more and more because of the higher heat thermostats that were installed to combat emissions. Also because of leaner fuel mixtures. Make sure that solenoid is releasing and allowing the carb to close "all the way" and not stopping against that solenoid. It should also open the gas a tiny bit when the key is turned on. Many times mechanics over the years mistakenly think that these are for adjusting the idle and screw them out so far that the carb can't shut off when the motor is turned off. Bet that is your problem as well.
2006-12-12 14:28:46 · answer #2 · answered by mohavedesert 4 · 0⤊ 0⤋
This doesn't happen with new vehicles because all newer vehicles have computer controlled injectors. The symptom has a name. It's called "dieseling". Check the answer below.
When you shut off you engine, your spark plug still glows briefly, and will ignite the fuel in the chamber. Check you spark plugs and make sure they are not be sooty or blackened. the fuel mixture is too rich.
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2006-12-12 08:58:13 · answer #3 · answered by Richard F 1 · 1⤊ 0⤋
I agree, its "dieseling" carbon on the pistons.You should be running 93 octane with that motor.The carbon can be removed by holding the throttle to idle it up when its up to temp and slowly pouring water in through the carb this will knock the carbon loose and blow it out.
2006-12-13 10:59:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋
The idle of the car is set too high, lower the idle, or when you stop to turn off the car, turn it off while its in drive and your foot on the brake.
2006-12-12 21:50:59 · answer #5 · answered by kayef57 5 · 0⤊ 0⤋
Bad/old ignition switch. You may be able to get a new one from a Lincoln dealer. Chances are they used that same switch for years after your vehicle was made.
2006-12-12 08:42:36 · answer #6 · answered by Mike Hunt 5 · 0⤊ 1⤋
this is what is called dieseling. too much gas is remaining in the carb when you shut it off. you probably need to have your carb tuned or maybe even rebuilt.
2006-12-12 08:42:49 · answer #7 · answered by cadillacrazy 4 · 0⤊ 0⤋
back in 1969 we had leaded gas. your car's timing was set for that . today all we have is no lead gas wich means your timing needs to be retarded somewhat thats why it keeps running on
2006-12-12 08:42:19 · answer #8 · answered by Maka 7 · 0⤊ 0⤋
Needs a tune up also check the Idle and while you are at it check the timming too
2006-12-12 08:42:39 · answer #9 · answered by bigdandsoni 1 · 0⤊ 0⤋
cheep gas or timing is off
2006-12-12 08:56:06 · answer #10 · answered by geneo 2 · 0⤊ 0⤋