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Back Fire Question

Old Sep 4, 2012 | 09:13 PM
  #1  
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Back Fire Question

i have 1978 f150 it backfires when i mash the gas or accelerate quikly, and when i start it, it will kindarumble and then die i have to hole the gas to get it to stay running on the first try, i check my wires they are in order and the plugs are all secure and wires as well. and the fuel filter is less than a year old, the exhuast manifold looks fine too, it has an Edlebrock 4BBL 16 series and intake manifold. What do i do
 
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Old Sep 4, 2012 | 09:30 PM
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Sounds like the timing is way off, or a combo of timing and your carb needs adjustment. Is your vacuum advance hooked up to ported vacuum and not all the time time vacuum?
 
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Old Sep 5, 2012 | 06:01 AM
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Agree with ChiefM. Time for a tune-up.
 
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Old Sep 5, 2012 | 07:59 AM
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My truck had a similar issue about a yr ago. After replacing the worn out fuel pump and having the Holley 4bbl rebuilt slightly my truck runs great. But i do agree with these guys the distributor timing could be the problem if theres lots of back firings.
 
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Old Sep 5, 2012 | 01:43 PM
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Yep,timing first then carb. Just did my 302 yesterday ,timing was retarted way to much and i stuck a vac guage on the carb to set idle screws and got it a lot better. I'l find out the next time i take off in it, at least it don't back fire now and will keep running.
 
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Old Sep 6, 2012 | 03:25 PM
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If it's not the timing, could need a bigger pump shot from the carb.
 
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