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    Author Topic: 340 acting up!  (Read 1060 times)

    Offline mikerallye

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    340 acting up!
    « on: July 23, 2008 - 06:33:26 PM »
    I kicked it down and it started to backfire at high rpm. It died in my driveway, and liked to never have started. The plugs were dry, I cracked the fuel line and it plenty of gas trying to escape. I poured gas in the carb and nothing. I waited 15 minutes and it started like nothing was wrong? I did notice I had to tighten the hot battery cable due to all of the cranking. Is it the ignition module? It still has the tan original on it?  :villagers:
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    Offline Moparal

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    Re: 340 acting up!
    « Reply #1 on: July 23, 2008 - 06:35:32 PM »
    Look under the cap for crack lines , carbon build up, or a worn rotor if it is not water in the fuel or something like that. See if the plug wires are close to exhaust too
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    Offline MEK-Dangerfield

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    Re: 340 acting up!
    « Reply #2 on: July 23, 2008 - 07:16:53 PM »
    Next time, look down the throat of your carb before you try to restart it. If you pump the pedal a couple of times, the throat should be wet with gas. That will eliminate a fuel delivery problem. Then we move onto spark...


      Mike
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    Mike

    1970 Challenger - SOLD
    2016 SXT+.  1 of 524 SXT+'s in Plumb-crazy for 2016.

    Offline moparmaniac59

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    Re: 340 acting up!
    « Reply #3 on: July 23, 2008 - 07:36:07 PM »
    Could be trash on the needle & seat in your carb, or the coil starting to go. Just for the heck of it, you might want to pull your coil wire and look for fluid seepage (which would indicate it's bad, but it can go bad without leaking fluid). Even a dirty fuel filter can give sporadic symptoms with a little piece of trash that moves back & forth inside the filter that can momentarily block flow. Just a few thoughts. Lets us know what you find!! Before it's done we'll have you replacing the headlight fluid!!  :roflsmiley: Just kiddin' gremlins are no fun!! :pullinghair:

                                                               Matt B.
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    Matt

    Offline Bullitt-

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    Re: 340 acting up!
    « Reply #4 on: July 23, 2008 - 07:49:46 PM »
    Was the engine hot? Had you been running for very long?  Electrical issues with any part could be caused by heat, my first thought is the coil.
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
    Screwed by Photobucket!

    Offline mikerallye

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    Re: 340 acting up!
    « Reply #5 on: July 23, 2008 - 09:12:53 PM »
    I pulled no.1 plug and no spark!
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    Offline mikerallye

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    Re: 340 acting up!
    « Reply #6 on: July 23, 2008 - 10:09:21 PM »
    Quote from: mikerallye on July 23, 2008 - 09:12:53 PM
    I pulled no.1 plug and no spark!

    You were right on ! I used your test diagram and the coil tested bad. I had an old one laying around and she fired right up!    :burnout: :burnout:  I never suspected the coil since I only have about 300 miles on the bad one.   :dunno:
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    Offline LAA66

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    Re: 340 acting up!
    « Reply #7 on: July 23, 2008 - 10:43:14 PM »
     Just curious, do you have original factory wiring?
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    Offline mikerallye

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    Re: 340 acting up!
    « Reply #8 on: July 24, 2008 - 11:18:22 AM »
    Quote from: LAA66 on July 23, 2008 - 10:43:14 PM
    Just curious, do you have original factory wiring?

    Yes, stock wiring, the bad coil was an autozone chrome high performance coil. I just put the stocker back on.
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    Offline LAA66

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    Re: 340 acting up!
    « Reply #9 on: July 24, 2008 - 09:57:52 PM »
     Glad you got it figured out.  :thumbsup: I guess we need to watch some of those aftermarket coils. :eek7:
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