hey im new at the whole /6 thing i just recently bought a 73 Plymouth duster love the car she needs a lil work but other then that shes fine one of the bugs is that when i go try to turn her off she still runs and idk why iv asked around and my buddy who owns a 71 duster hasn't written me back i need to fix this jus need to know how so if any ones got any info it be appreciated

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gots me a 73 duster

Do you mean it keeps running or is diesels? Dieseling is usually caused by to much advance in your timing or a rich idle mixture.

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Tito- Welcome to the site and to the world of slant six ownership. I hate being a tight-ass, but I would encourage you to use capitalization, punctuation, proper grammar, and correct spelling in your posts. Doing so makes your posts much easier to understand and will lead to a greater chance of someone posting an answer.

With regards to the problems with your Duster, run-on can be caused by a large number of issues, sometimes more than one at the same time.

I would start by purchasing the factory service manual for you vehicle and by doing a complete and thorough tune-up. Use the search function on this website to find sources for service manuals and recommendations for tune-up parts and procedures.

Welcome aboard tito13trooper,

I have to agree with Barrister Reed, a well written post will be helpful to both you & someone trying to guide your hands from half way around the world to fix your car.

I to suffer from a real bad case of crappy spelling, it has been going on now for over fifty years, but thanks to Microsoft Word, spell check, and copy & paste, most of my miscellaneous ramblings can now understood… Well perhaps 75% of them anyway, I do tend to mumble at times.

As 70valiant said, could be rich idle mixture adjustment, too much timing, also too high idle speed, or perhaps a carbon build-up in the combustion chamber from engine not running properly for a long time. Hard to tell why it runs on until you do a little investigation, and a perhaps a few tests.

On this page “Engineâ€￾, at the top, there is a “Stickyâ€￾ titled; “Frequently Asked Questionsâ€￾ it is full of information, on tune-ups, method of valve adjustment, and a lot of other interesting subjects. Until you can get your copy of a factory manual, these “stickiesâ€￾ will be a great help for you. Also on the home page there is a button titled “Articlesâ€￾, also packed full of great topics just waiting for your viewing pleasure.

Bill

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Or you can just shut the car off while its still in drive.

Agree.
Sometimes just having the idle speed set too high can cause dieseling.