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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

carb problems

Old Aug 11, 2006 | 08:25 PM
  #1  
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carb problems

hi all, i have a 300 with a 2 year old carb. a couple of days ago it started acting up, would idle really nice, but touch the gas peddle and it would bog down and backfire. now it doesn't even idle, just chugs for a few seconds and blows gas out the carb. today i tore down the carb, and didn't find and dirt in it. everything seems to be intact, but it still pores gas out. i cleaned everything with carb cleaner, checked for worn or damaged parts, still no luck.
i blocked off the fuel lines, still the same thing so it's not the fuel pump.
thanks
mark
 
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Old Aug 11, 2006 | 08:28 PM
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It sounds more like the cam gear is starting to wear out and skip. Have you checked your ignition timing?
 
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Old Aug 11, 2006 | 08:40 PM
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the engine was rebuilt a few years ago, with only 30 000 miles on it. the timing was checked last year and was fine. i can't check it now because it won't even run long enough for me to run from the door to the hood.lol
spent 3 hours today trying to get a rebuild kit for the carb, the parts store i bought it from doesn't even carry a rebuild kit for it, and none of the other stores in london could even look it up.
finally found one which should be here tomorrow.
thanks
mark
 
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Old Aug 12, 2006 | 05:04 PM
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well i rebuilt the carb, still doing it. but the rubber piston was slightly torn, so it needed to be done. anyone have any ideas? i pulled the fuel filter out and it's clean, blew the lines out and found nothing.
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mark
 
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Old Aug 12, 2006 | 08:54 PM
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Was a fiber timing gear used? If it was, replace it.
If you can, get somebody to help you so you can check the timing. I bet you will find your problems there.
 
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Old Aug 12, 2006 | 09:09 PM
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any way to check the timing when i can't even get it to start? this things really pi**ing me off now. when i turn it over it just floods, shoots gas out the carb and then backfires and spins the engine backwords.
thanks all
mark
 
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Old Aug 13, 2006 | 08:43 AM
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Did you replace the float?
 
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Old Aug 13, 2006 | 10:13 AM
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the float was fine, no gas in it. even the level of the float was ok. no wear on the pin or anything. now today i have no spark. what a week.
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Old Aug 13, 2006 | 04:32 PM
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Pull the distributor cap off, and use a remote starter or have someone hit the key, and see if the rotor spins.
It's not sounding any less like a bad timing gear.
 
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Old Aug 14, 2006 | 04:50 PM
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spins fine, seems to be a little off of timing, just waiting for the poof of tdc. will be able to tell better when the coil gets here. also going to do the points and condenser while i'm here. hopefully they will be here by thursday.
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mark
 
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