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Old 06-04-2009, 05:26 PM
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Holly 4bbl carb help. or timing problem

ok here is the thing i am getting spark but when i turn my car over it back-fires and will not start and when it back-fires my carb lights up like the 4th of july and shoots a fire ball out of the top. would that be caused by the carb or a serious lack in timing.

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Old 06-04-2009, 08:30 PM
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Forth of July

It sounds like you have the distributor out of time, and or your accelerator pump is not making the engine rich enough to go on with the air flow. You may want to pull the #1 spark plug out and start from scratch and make sure your timing marks are not off if you are using a timing light. If you are using a timing light use a good one that has the dialable timing on the back then you can accurately check the total advance. Check your cam on the carb for the accelerator pump, adjust it and the stroke on the pump lever correctly as well. If you are using points, I have seen where oil has gotten on the points and caused all kinds of miss fires and back fires.
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Old 06-04-2009, 08:51 PM
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What exactly are you working on .Sounds more like timing to me. Have you been moving the timing around lately. Probably 180 out take the #1 plug out get it back up on #1 see where its at and go from there. Has anyone been adjusting on the valves or timing? possibly have them out . Cole
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Old 06-04-2009, 10:52 PM
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I Agree I think it sounds like it is 180 out. Just went thru this problem myself. Make sure you are on the compression stroke. and check to see where its pointing make sure its a number 1 plug on compression stroke. I was setting my timing and I went past tdc and rotated it back around once to TDc and ended up being off by 180 I forgot I needed to rotate it twice to get it back on the compression stroke
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Old 06-04-2009, 11:27 PM
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Sorry i was not more specific it was on my 79' 350 Camaro RS and it was just 180* out of time thx for the help all
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