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63 Galaxie rough running at cruising speed


JRZZ
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Hey have 63 Galaxie 352 with the stock Ford 2100 2 barrel carb. Accelerates and idles really good. When reach cruising speed and ease of the gas runs rough. Have stripped down, cleaned and re-kitted. Idler mix screws were only half turn out when should be between 1 & 1.5 turns out. Still running rough at cruise at half, 1 and 1.5 turns out. Any ideas? 
 

Cheers Justin 

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Thinking through things that change when you back off the gas and take the engine load off.

Manifold vacuum might drop - Does it have vacuum advance? Could it be a vacuum leak affecting the advance?

 

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I do want to replace the coil, it looks ancient. But would have though if was spark related wouldn't idle or accelerate smoothly.

It does have vacuum advance, will check that not leaking when get home tonight cheers, looked to be ok when we re-kitted in the weekend.

I will also check the timing.

Funny thing was running really good until Easter when I had a breakdown due to the float getting a hole and sinking and flooding it. Have replaced float and made sure the level is to the factory specs. Ever since then has had this issue.

Cheers for your replies

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Perhaps factory specs isn't where the float was previously, or maybe a slightly different float.

If it were me and I couldn't figure it out, I'd be looking to get it on a dyno to see what the AFR's are doing.

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6 hours ago, Lord Gruntfuttock said:

Electrical system OK?
I've chased 'carb' issues before and was spark related...

Most "carb issues" end up being the ignition 

Most "ignition issues" end up being the carb 

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So further to my post yesterday I adjusted and re-adjusted the idler mix screws, still runs rough at cruising speed.
Took top off carb and got really excited cos thought I found the problem as was flooded, the new fuel inlet needle seat and needle was allowing fuel in when float was fully raised, put old one back in. Not flooding anymore but still running rough at cruising speed bugger it.

Going to check ignition next.

 

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Funny thing was running really good until Easter when I had a breakdown due to the float getting a hole and sinking and flooding it. Have replaced float and made sure the level is to the factory specs. Ever since then has had this issue.

 

Sounds to me like it was fine until the carbie shit itself so thats where I would be looking. Is the car idling the same with idle mixture screws at 0.5, 1 and 1.5 turns open? Tweaking them should make a difference to idle. How old is the fuel? A bit of condensation in the tank , water sitting in a main jet or porting? A litre of meths in the fuel tank for this.  Throw some of NPDs finest 100+ in it. This cleared up issues with our Caddy without pulling anything apart. Good luck.

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Turns out it is running rich, checked the plugs last night (which are new) and they are black (had the idler screws out 1.5 turns. Going to try screwing them back to 0.5 and lower the float level a bit. Fuel was filled up last weekend, got 95 in it.

Cheers

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37 minutes ago, JRZZ said:

Turns out it is running rich, checked the plugs last night (which are new) and they are black (had the idler screws out 1.5 turns. Going to try screwing them back to 0.5 and lower the float level a bit. Fuel was filled up last weekend, got 95 in it.

Cheers

Put 100 in it. 

I get that it's an American lump used to running on garbage but give it a fighting chance to be good. 

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So I lowered the float level a little last night to where the old one sat and screwed the Idler Mix screws back into 0.5 turn out as it was before. I also checked the timing (which was fine, perfectly at 8º as per the manual. Still running rough at low cruising speed. Checked plugs after drive, nice and clean. Fuck sake!!!

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