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    Author Topic: Run on  (Read 1501 times)

    Offline shadango

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    Run on
    « on: August 04, 2009 - 12:44:15 PM »
    So I have my timing up at around 17-18 initial, no vac advance...seems I need that much what with my suspected) cam.

    I have adjusted the idle down to where it will ridle in gear without dying...oil pressure at 20-24 psi....400-500 rpms or so....in park it idles up around 900---1000.

    If I shut the ignition down as soon as I shift to park I am fine....if I let it idle up a bit I get some run on when I shut her down.

    I have accell "header" plugs in there now.....I want say they have "11" apart of the number....a 3 digit number from what I recall....

    Can I go to a cooler plug to solve this you think? I dont have any pinging....I may be idling a bit rich...but I am afraid to mess up what I have accomplished to date by messing with the carb anymore...LOL....would like to put new plugs in anyways so I thoiught i could try this....I also have plans fo a set of firecore50 wires.

    Thoughts?
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    Offline CHL2T

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    Re: Run on
    « Reply #1 on: August 04, 2009 - 01:00:32 PM »
    I've never had that trouble with any of my Mopars unless they were overheating , I did however have it in a 79 Clamaro and an 85 GMC truck. To take care of it, I would simply turn the car/ truck off in gear. Works every time
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    Offline shadango

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    Re: Run on
    « Reply #2 on: August 04, 2009 - 02:43:16 PM »
    Yeah, as long as I turn it off as soon as I shift to park I am ok...LOL

    Now, I am not yet running the 16lb rad cap (I have a 9lb right now)...wondering if maybe I have boiling or hot spots due to the lower pressure?

    Motor is not over heating though...running cool according to the two gauges.....stock and aftermarket....
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    Offline MEK-Dangerfield

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    Re: Run on
    « Reply #3 on: August 04, 2009 - 06:41:19 PM »
    Umm, my only experience with run on was either too low of octane fuel, or a timing issue.    :2cents:


      Mike
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    Mike

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    moparniac

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    Re: Run on
    « Reply #4 on: August 04, 2009 - 07:02:39 PM »
    make sure the return springs aint wore...... will hold the carb open some and keep the car chugging after turning off the key...  :working:
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    Offline 422STROKER

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    Re: Run on
    « Reply #5 on: August 04, 2009 - 07:13:07 PM »
    Still some carb tuning I'd supect!  Either that or the Stall converter you have is REAL tight.  It may be if you have a big cam in that thing.  Go for the carb tuning first.
    Tom

    For reference, my car Idles at 850P/N and 725Drive.
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    Tom
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    Offline Bullitt-

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    Re: Run on
    « Reply #6 on: August 04, 2009 - 07:18:10 PM »
    Quote from: StRoKer on August 04, 2009 - 07:02:39 PM
    make sure the return springs aint wore...... will hold the carb open some and keep the car chugging after turning off the key...  :working:

    Only problem I've ever had with run on or dieseling is what we called it was the butterflys of the carb were not closing.  This could tie in with your extreme fast idle issue. 
    « Last Edit: August 04, 2009 - 07:20:01 PM by Bullitt- »
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    Offline 6packCuda

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    Re: Run on
    « Reply #7 on: August 04, 2009 - 07:32:16 PM »
    Even if the throttle plate was sticking open a bit, it shouldn't keep running on. For whatever reason, the fuel is being ignited by heat in the combustion chamber. I would say either your fuel is too low octane or too high volatility. Or, your timing is retarded causing way too much heat in the combustion chamber.
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    Dave

    moparniac

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    Re: Run on
    « Reply #8 on: August 04, 2009 - 11:29:54 PM »
    Quote from: 6packCuda on August 04, 2009 - 07:32:16 PM
    Even if the throttle plate was sticking open a bit, it shouldn't keep running on. For whatever reason, the fuel is being ignited by heat in the combustion chamber.

    from extra fuel being dumped into the cylinder.....  :working:

    I had this happen before!  :working:
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    Offline 71chally416

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    Re: Run on
    « Reply #9 on: August 05, 2009 - 01:07:31 AM »
    Quote from: HANDM on August 04, 2009 - 01:00:32 PM
    To take care of it, I would simply turn the car/ truck off in gear. Works every time

    I agree.  If you're looking to get A1 quality gasoline nowadays every time you fill up you're crap outta luck. Leave it in drive when you turn it off and your problem is rectified.   
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    Offline shadango

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    Re: Run on
    « Reply #10 on: August 05, 2009 - 05:42:47 AM »
    Thanks guys....

    The return springs are brand new, butterflies seem to be closing fine, timing is set at 18 degress now with no vacuum adv.....idle is as low as I can get her.

    The way it pulls hard once the rpms come up and a lousy low-end could point to a cam.........so the convertor may be a factor here.

    Was thinking maybe have some built up carbon on the pistons and that is causing it.....was going to try an in-tank cleaner or seafoam at some point.....

    Chally, your solution is probably the easiest.  It generally wont do it if I shut her down as soon as I shift to park......its embarassing to pull up in a lime green barracuda with everyone checking her out and then she chugs on after I shut her down.... :-[ 
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    Offline 71chally416

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    Re: Run on
    « Reply #11 on: August 05, 2009 - 06:21:31 AM »
    Had a 440 chally during the 80's that used to do that every time with the crappy gas we had back then. Once you get used to it it's no big deal. Just don't forget to put it in Park.  :22yikes:
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    Once we had Ronald Reagan, Bob Hope & Johnny Cash. Now we have Obama, No Hope and No Cash!

    Offline shadango

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    Re: Run on
    « Reply #12 on: August 05, 2009 - 06:48:53 AM »
    LOL  I hear ya on that one!

    As I have gotten older I have realized that I am more likely to forget to put the car (any car) in park.....LOL.....at only 41 thats not a good sign......<grin>

    I think part of it is that my daily driver is a motorcycle so jumping into an automatic car again ...well, ya know.

    LOL
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    Offline Chryco Psycho

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    Re: Run on
    « Reply #13 on: August 05, 2009 - 01:07:10 PM »
    3 thiungs genersally casue run on , timing , mixture & idle speed , in you case I susopect it would be a combo fo idle speed & mixture setiings
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    Offline shadango

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    Re: Run on
    « Reply #14 on: August 05, 2009 - 01:21:26 PM »
    Well idle in park is only about 8-900 or so....

    Any lower and she stalls in drive....

    Mixture could be a bit rich.....
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