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Starting Problem - Intermittent

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Old Jan 5, 2015 | 04:08 PM
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Matty Fraser's Avatar
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Starting Problem - Intermittent

1977 f250 351M.


Very intermittent.

Every 30 or so starts truck misfires**. Upon attempting restart I can't get any spark unless I pump really gas really hard and it feels like im forcing gas into carb or something and it really hesistates and starts slow. Or it floods and I have to attempt again after 10min.

As soon as it fires up it drives fine. Every other start when I don't have this problem (misfire) it fires up instantly.

Gas system has all been replaced up until carb.

Could this be the accelerator pump in the edelbrock carb?

Thanks,

Matty
 
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Old Jan 5, 2015 | 04:21 PM
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When you say you cant get any spark does this mean you assume you get no spark or have you actually checked for spark?
 
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Old Jan 5, 2015 | 04:29 PM
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I haven't checked yet. But its feeling like fuel issue, or can spark be related to the extreme pedal pumping?
 
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Old Jan 5, 2015 | 04:37 PM
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Could very well be power valve. Really hard to say with descripition given.
 
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Old Jan 5, 2015 | 04:44 PM
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I tried to simplify it noone was really getting back to me here when I over explained it lol: https://www.ford-trucks.com/forums/1...l#post14928507
 
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Old Jan 5, 2015 | 07:17 PM
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where can I find power valve? noob question.

I had some blue smoke coming from exhaust on hot days this summer, related? I saw something about it online.

Thanks,

Matt
 
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Old Jan 5, 2015 | 10:29 PM
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The blue smoke usually indicates that you're burning a bit of oil.


I don't expect that this could be a spark issue, since you mentioned that it runs fine as soon as it fires up.


The misfire you describe, what exactly happens? A backfire? Absolutely nothing?
 
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Old Jan 6, 2015 | 01:00 AM
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hey Wils thanks for reply.

Its turns over and almost half starts with the ignitoion cranked.

I am thinking it's the accelerator pump I haven't done a check on it yet its been storming here in Whistler.

Thanks.
 
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