Question about 1985 Ford F150

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Backfire when turning over

Or whatever you call a flame shooting from the carb.  After replacing a broken fuel pump and finding a broken distributor cap, and replacing them, the truck won't turn over.  I'm not sure how to find out the engine size, but I've been under the impression that it's a 306  ( straight 6, 4.9, built in Canada, automatic), but now I'm thinking that I've bought the wrong parts and thrown the timing out.  How do I find out what size my engine is and, if it is a 306, what is causing it to turn over, start to run rough, but cough out smoke or flames through the choke before it dies???

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I found out that it was that the magnet was missing from the plastic engine control portion that makes the connection below the distributor button.  That coming off probably caused all the breakage to begin with. Thanks for your help.

Posted on Jun 02, 2008


I found out that it was that the magnet was missing from the plastic engine control portion that makes the connection below the distributor button.  That coming off probably caused all the breakage to begin with. Thanks for your help.

Posted on Jun 02, 2008

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The cause most likelly is than you did misplaced the plug wires
make sure to get a firing order and have the plug wires at right tower of distribuitor cap they have to go exactly to one position or engine will misfire shake or won't start

Posted on Jun 02, 2008

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If it has spark then it's probably a fuel delivery problem. Not to over look the obvious but make sure you have fuel in the tank. Maybe the gauge is broken then work forward to the fuel pump. Check delivery on the output of the pump. If it a mechanical pump which I think it is remove the hose connected to the carb and feed into a container and crank to see if there is flow. If not replace fuel pump. If ok you have a carb problem. If it has a clear little round window on the side of the carburetor you should see the fuel level. Maybe the float level seat is sticking but this is highly usually. We know that the cam belt is ok because you have spark so the distributor is turning. Hope this helps.

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Could be something in the distributor cap, a blockage in the fuel line, even a bad timing chain.
You need to know if you are getting spark to all of the plugs, fuel pressure to the injectors, and normal compression.
If it is a fuel problem you should be able to spray carb cleaner into the throttle body to make it try to start. If you have spark but at the wrong time, it will backfire by firing on the wrong cylinders. This can be caused by a faulty dist cap or rotor, or the timing chain.

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Hello, i have a 1984 ford bronco ll, a 3.0 v6. the coil is working, and all plugs are fireing, and we set the timeing on the distributer,and it makes a poping noise and shoots fire out of the carb when i...

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If you can pull the fuel line, past the fuel pump, off, turn the motor over to see if gas shoots out of the fuel lines. If it doesn't your fuel filter might need to be changed. Also try to see if your getting fuel past the filter useing the same method.After that pull your air filter off so you can look into the carb to see if fuel is being pumped to the carb. Be careful if the car backfires thru the carb. it can catch fire and the flame will pull the gas to the carb and it will keep burning and get bigger and hotter. I had this happen and I just stuck a shop rag in the carb and put the flame out. Don't burn your car up, your house, your self etc.

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