1968 Chrysler 300 engine trouble

19,000 MILES
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CECILD585
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  • 4 POSTS
the car cranks and runs great but after you drive it for about 2 hours it shuts off and when you try to crank it it starts backfiring it backfires so bad it blows the muffler out every time but if you let the car sit for a little while it cranks back up and drives again till a little bit later it starts all over again. I have changed the electronic ignition out, changed the distributor and the carburetor, put new fuel lines and filter and the problem still keeps happening.
Aug 12, 2013 at 5:43 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Does this vehicle still have points and condenser? If so, start there. Make sure the dwell is properly set on the points (replace if burnt) and I would recommend replacing the condenser.

Let me know.
Aug 12, 2013 at 2:36 PM
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CECILD585
  • MEMBER
  • 4 POSTS
no I changed it over to electronic ignition
Aug 14, 2013 at 2:15 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Does it seem like the timing is out?
Aug 14, 2013 at 1:18 PM
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CECILD585
  • MEMBER
  • 4 POSTS
no it fires right up when you hit the key and drives fine it just shuts off after you drive it for about 2 hours but soon as it cools down for about 30 min it will crank right back up again
Aug 15, 2013 at 5:00 AM
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CECILD585
  • MEMBER
  • 4 POSTS
I had the timing set by a shop
Aug 15, 2013 at 5:15 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Okay... for the 30 minutes that it won't restart, have you checked to see if it is getting spark and fuel to the engine?
Aug 15, 2013 at 11:31 AM
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