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1968 Chrysler 300 engine trouble

Tiny
CECILD585
  • MEMBER
  • 1968 CHRYSLER 300
  • 19,000 MILES
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.
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Monday, August 12th, 2013 AT 12:43 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 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.
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Monday, August 12th, 2013 AT 9:36 PM
Tiny
CECILD585
  • MEMBER
  • 4 POSTS
No I changed it over to electronic ignition
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Wednesday, August 14th, 2013 AT 9:15 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
Does it seem like the timing is out?
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Wednesday, August 14th, 2013 AT 8:18 PM
Tiny
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
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Thursday, August 15th, 2013 AT 12:00 PM
Tiny
CECILD585
  • MEMBER
  • 4 POSTS
I had the timing set by a shop
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Thursday, August 15th, 2013 AT 12:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 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?
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Thursday, August 15th, 2013 AT 6:31 PM

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