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1973 F 350 Super Camper Special

 
  #1  
Old 06-08-1999, 02:06 PM
steer
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1973 F 350 Super Camper Special

I have a 1973 F 350 Super Camper Special with a 390, 2 Barrel Carburetor. Total mileage is less than 150,000 and the truck is in great shape. As I drive and the engine warms up, (any time of year), I start to get backfiring - especially as I approach highway speeds. I feel that the Carb is the issue and do not know how to isolate the problem. The Carb has been rebuilt once, (unsuccessfully I feel), by a shade tree mechanic at a garage about 7000 miles ago. Any suggestions? I would like to take on the task of replacing, not rebuilding, the Carb myself and need guidance on how to start and what to expect. Can you assist? Also, the heater core needs to be replaced and the quotes I get for the work are all in excess of $500.00. The truck does have AC and everyone states the price is so high because the AC is a real interference. Again, any suggestions?
 
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Old 06-08-1999, 05:14 PM
Marty
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1973 F 350 Super Camper Special

If you want to replace the carb with another 2v, I would get a used one off a similar truck and rebuild it, or have a reputable shop do it. If you want a new 4v, I would suggest a Carter AFB or Edelbrock, they usually use less gas and require less fiddling with than a Holley.

As far as the heater core, did you check out the tech article on this site. There is a step by step explanation of changing a heater core with a/c. Read through it and see if it is something you would be able to tackle yourself.


 
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Old 06-09-1999, 03:47 AM
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1973 F 350 Super Camper Special

You're in luck. Check out <a href="https://www.ford-trucks.com/articles/heater.html">https://www.ford-trucks.com/articles/heater.html</a>

Regarding the carb, is there anyway you can borrow another carb just to troubleshoot the problem?

I had the same problem and traced it to the wires or the ignition module. Like a dummy, I replaced both and the problem went away so I don't know which fixed it. I'm pretty sure it was the wires. Someday I'll put the old module back in to verify.

Tip: Always keep a spare ignition module in the truck. When they die, they really die.
 
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Old 06-09-1999, 07:37 AM
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1973 F 350 Super Camper Special

76 Highboy - Thanks for the info but "ignition module"? Where is it located? Your'e not reffering to the selenoid are you?
 
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Old 06-09-1999, 07:52 AM
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1973 F 350 Super Camper Special

Don't think you will find the ignition module on a '73. Didn't that come later?
 
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Old 06-09-1999, 10:18 AM
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1973 F 350 Super Camper Special

The module is an aluminum box on the fender that controls the electronic ignition. Yours should have points. Check the points, make sure they are not burnt. When my points where getting bad in my 73 390 it would pop and backfire at high rpms. I did the DurasparkII conversion (FTE tech article) on mine to change it over to electronic ignition and now I don't have any points to worry about.

Make sure the points are adjusted correctly or you may want to just replace them if it hasn't been done in a while.
 
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Old 06-09-1999, 05:20 PM
fordmando
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1973 F 350 Super Camper Special

Sounds like ignition trouble to me. I had a friend with a 78 Jeep Cherokee 360 (with the Duraspark ignition, AMC used the best parts they could buy at the time) and it did the same thing. Even if you have points, I would suspect the condenser or the points themselves.

George
 
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Old 06-16-1999, 11:16 AM
Jake
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1973 F 350 Super Camper Special

Another way to get rid of points, if you're not trying to stay competely original is to use an Ignitor electronic module. I used one in my 73 for quite a while with much success. It replaces your points and condenser and never needs to be replaced or adjusted. It is made by a company called Pertronix and a lot of mail order places carry them. I think JC Whitney might even have them. Mine costed about 65 bucks three years ago, which wasn't too bad since I never had to set the point gap again. Good luck.
 
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Old 06-16-1999, 12:55 PM
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1973 F 350 Super Camper Special

Just one more thing to check- this is a long shot but here it goes. Make sure you don't have a leak at the intake, the carb base or at any of the intake ports. I had a problem of the type you have indicated. New carb, ignition, and a few other items, none of which cured it. Just by dumb luck it started whistling while I was under the hood-traced it to a vacuum leak where the intake meets the head. New intake gasket cured it.
 
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Old 06-17-1999, 07:55 PM
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1973 F 350 Super Camper Special

I've seen them on '75s and later and assumed they went back to '73. Sorry.
 
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Old 06-17-1999, 09:53 PM
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1973 F 350 Super Camper Special

 
 
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