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1979 Other Dodge Models

Tiny
JOECOOL21
  • MEMBER
  • 1979 DODGE
  • V8
  • 2WD
  • AUTOMATIC
  • 132,000 MILES
I'm running out of options for this Aspen. I have been having backfire issues. I have changed the plugs, wires, distributor cap, cleaned the egr valve, adjusted the carb (which is a 2 barrel holley), and replaced the fuel pump.
The backfiring doesn't really start to happen till I get up around 50 mph. It also backfires when you let off the gas. Any help would be greatly appreciated. Also the spark com computer is currently mounted on the air cleaner and not where it is in the picture.


http://www.2carpros.com/forum/automotive_pictures/143372_100_1972_1.jpg

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Monday, January 14th, 2008 AT 10:37 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
Hi:
The most common cause of a backfire is a vacuum leak. Have you checked everything for that problem? Also, Is it backfiring from the exhaust or the intake? Does it change under different accelerations?
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Saturday, March 14th, 2009 AT 6:39 PM

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