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Anonymous
Anonymous Posted on Oct 26, 2012
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I have a 1972 gran torino, it has a holly doublepumper,302 engine, it backfires through the carburator,what causes it to backfire?

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cameron_goul

cameron_goul

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  • Expert 108 Answers
  • Posted on Oct 27, 2012
cameron_goul
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5 Related Answers

Anonymous

  • 6982 Answers
  • Posted on Apr 26, 2009

SOURCE: 1997 jeep grand cherokee backfires

check for leaks in exhaust ahead of converter, check cap and rotor for tracking between contacts, code check for fuel and other faults.

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Anonymous

  • 398 Answers
  • Posted on Mar 08, 2009

SOURCE: engine backfire when decelerating

did you check spark plugs and wires? this would be the first step

GM Elec

Bruce Bracey

  • 1000 Answers
  • Posted on Apr 08, 2009

SOURCE: backfiring

The backfiring on deceleration is typically associated with a loose timing chain.

If you put a wrench on the harmonic balancer bolt, turn the balancer gently until you feel the chain tighten, then rotate the opposite way until it tightens, how far does is move.
If it goes more than an inch, it is getting sloppy. If it moves closer to 2 inches, it is worn out.
Try that first then let me know and we can go from there.
Good luck.
Regards,

Anonymous

  • 1486 Answers
  • Posted on Nov 18, 2009

SOURCE: Blazer hesitates, backfiring and bogging out

auto choke sticking on get it checked out..

Anonymous

  • 1985 Answers
  • Posted on Dec 28, 2009

SOURCE: 1972 ford 302 V8 What is the timing spec? The

10 degrees BTDC

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Back fire, now misses
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Hi I'm new to this site , I have been asked to close Q I have asked already but don't know how on my iPhone to close then please help
There are two kinds of backfires, one is produced from the engine air intake and the other is produced from the tail pipe of the exhaust system. The cause for a backfire condition can vary depending on the malfunction of a particular system. Some backfires can be extreme enough to cause damage to related components. Anytime a backfire is observed immediately diagnose and repair as needed. If the engine is running rough it can produce a backfire. A backfire occurs when there is an imbalance in the air to fuel ratio required for your vehicle to operate properly. If the fuel mixture is too lean (not enough fuel) you may have a backfire in the intake manifold gasket, or too rich (too much fuel) you may get a backfire out of the exhaust system. It is important to observe the location of the backfire.
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Low end backfire and slow acceleration
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1985 ford ranger runs good for a couple of days
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Feb 17, 2010 • 2003 Isuzu Rodeo Sport
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What causes our 1986 chevy motorhome to back fire through the carburator? This occurs when you first take off, it stops after awhile when warmed up. Carburator has been rebuilt, new plugs, wires and cap....
Backfire in an automobile engine typically results from various malfunctions related to the air fuel ratio. Backfiring can occur in carburetor engines that are running lean where the air-fuel mixture has insufficient fuel and whenever the timing is too advanced. As the engine runs leaner or if there is less time for the fuel to burn in the combustion chamber, there is a tendency for incomplete combustion. The condition that causes this is a misfire. The result of a misfire or incomplete combustion is that unburned fuel or flammable hydrocarbons are delivered to the exhaust manifold where it may ignite unpredictably.


When starting an engine, timing that is too advanced will fire the spark plug before the intake valve is closed. The flame front will travel back in to the intake manifold, igniting all of that air and fuel as well. The resulting explosion then travels out of the carburetor and air cleaner. A common air filter will allow the gases to escape, but will block the flame front. On many small marine engines, no air filter is used, but a screen is placed over the intake of the carburetor as a flame arrest to prevent these flames from escaping the intake, and potentially igniting fuel, or fuel vapors in the enclosed sump or bilge of the boat and causing a fire or explosion. Improperly adjusted carburetors that create a lean condition during acceleration can cause the air fuel mixture to burn so slowly, that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a backfire. In this situation it is conceivable that there is a backfire occurring in the intake manifold and exhaust manifold simultaneously.

Good luck and hope this helps, check the carburetor settings to make sure it's not running too lean and the timing . Keep me posted, be glad to help you get your RV running 100% again.

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