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I was driving my wife's automatic '66 Dodge Dart 270 (slant-6) for about a mile when I heard a loud CRACK and the engine almost stalled, but then it immediately seemed fine. I looked in the rearview mirror to see if something had fallen off, but didn't see anything abnormal.

About another 4 miles later, I heard two more loud CRACKS in rapid succession, the car again seemed like it was going to stall, and this time I saw a puff of black smoke in the rearview mirror. Now I don't remember what exactly happened next, but I remember thinking it seemed like the powertrain suddenly didn't have as much power (I suppose maybe it downshifted and slowed down). After this, I parked it as soon as I could, which was about half a mile later. When I popped the hood, nothing seemed particularly out-of-the-ordinary except that one end of the bungee strap that was holding the battery was loose.

I'm hoping the CRACK sounds were just the bungee strap coming loose, but I don't know how it could have made the sound three times...I would have expected the strap could only come loose and whack around once, and I wouldn't have expected it to cause the engine to almost stall.

I'm hesitant to take it to the shop unless I can reliably reproduce the issue or something is obviously and visibly broken. I've also been trying to learn to fix my car myself. What are some things I should check?

More background (may or may not be relevant):

  • The oil was last changed in the spring.
  • I've been driving the car in-town 10 miles round-trip to and from work for about half of the summer, otherwise we were only driving it occasionally (maybe once a month on average).
  • The car usually has trouble starting on the first try. It'll start and immediately stall. If it's warm out, I can pump the gas pedal once and it starts up fine. Otherwise, it might take a couple more tries and I have to let it warm up for 30 sec. to a minute before I can drive off (otherwise it stalls as soon as I put it in gear and push on the gas).
  • The car was almost out of gas a couple days ago when I put in 6 gal, so it should have still had 4-5 gal. (though a few months ago I'm pretty sure someone tried siphoning gas from all our cars)
  • I fill it with 87 octane (non-ethanol) gas because otherwise the engine stalls a lot.
  • Sometimes when pulling away from a stop sign or light, the engine sputters and almost stalls, then suddenly goes back to running fine.
  • The power brake booster has been removed, so it has "manual" brakes.
  • I haven't used the parking brake recently
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any chance this was a backfire? –  mac Nov 15 '13 at 19:02
    
@mac I hadn't considered that, but I suppose it's possible. I don't remember hearing this particular noise before, especially not while driving. –  rob Nov 15 '13 at 19:32
    
@mikes that's a good idea; I'll check that later this afternoon. –  rob Nov 15 '13 at 19:35
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1 Answer 1

Look around the battery terminal and the fender and see if there are any sign of arcing. The loose battery may have shorted to the frame killing the ignition power and then moving away restoring things to normal. The black smoke may be from the unburned fuel drawn thru the carb causing a rich mixture on restart.

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Thanks for the suggestion. I checked but didn't see any sign of arcing. –  rob Nov 18 '13 at 17:34
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