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PostPosted: Fri Jun 16, 2017 10:12 am 
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Joined: Wed Jul 04, 2012 10:02 am
Posts: 11
Location: Battle Ground Wa.
Need help solving a high rpm full throttle miss.
I get a very rough miss at higher rpms and at high throttle settings. When I back off to less than half throttle the engine runs smoothly.

Here is what I have done so far to solve the problem with no luck.
1.Adjusted the float level to ford shop manual specs.
2. Replaced coil and spark plugs.
3. Replaced fuel pump and fuel filter.
4. Drained fuel tank and cleaned fuel lines.
5. Checked timing and vacuum advance all right on.

Any suggestion would be greatly appreciated

Thanks
Red

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PostPosted: Fri Jun 16, 2017 12:26 pm 
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Joined: Thu Sep 30, 2010 9:26 am
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Location: SKANNINGE ,SWEDEN
HI, You need to tell us, engine type, intake manifold and carb model?

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PostPosted: Fri Jun 16, 2017 2:09 pm 
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Location: Battle Ground Wa.
Hey thanks for getting back to me so soon

It is the 239 OHV engine. Standard OEM intake manifold and a Holly 2bl carb. ford part number EBU Standard OEM Carb.

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PostPosted: Fri Jun 16, 2017 6:12 pm 
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Location: Phoenix,AZ
oldbrown wrote:
Hey thanks for getting back to me so soon

It is the 239 OHV engine. Standard OEM intake manifold and a Holly 2bl carb. ford part number EBU Standard OEM Carb.
How old is the vacuum advance canister ? It may be failing under load but not when you check it with no load. Another issue that is getting very common is faulty condensers as many are now off shore made,if you recently replaced it and still have the old one you might try swapping it just to check,this has come up on Fordbarn.com numerous times.

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PostPosted: Sat Jun 17, 2017 1:17 pm 
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Joined: Thu Sep 30, 2010 9:26 am
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Location: SKANNINGE ,SWEDEN
Do have one or several gasket between carb and intake?
Single or dual exhaust?
Exhaust thermostat control valve on right manifold?

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PostPosted: Tue Jun 20, 2017 5:25 pm 
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Joined: Sun Jun 15, 2008 5:33 pm
Posts: 2895
Location: Houston
It's always a good idea to check for vacuum leaks when an engine is stumbling.

Get a can of carb cleaner. While the engine is running, spray it around the base of the carb, manifold connections, etc.

If the engine revs when you do this, you've found a vacuum leak.

If it's only stumbling at high speeds, it's probably not a leak, but it's so easy to check....you might as well do it and rule it out.

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PostPosted: Wed Jun 21, 2017 11:47 am 
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Like Jeff,I would suggest replacing the condenser.

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PostPosted: Thu Jun 22, 2017 2:30 pm 
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Location: Foster, Oklahoma
Did you replace plug wires? I had a similar situation on a 302 recently with wires that were only a couple years old. The suppressor wires don't last as long as the old solid cores did.

James

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PostPosted: Sat Jun 24, 2017 5:43 pm 
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Joined: Wed Jul 04, 2012 10:02 am
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Location: Battle Ground Wa.
I have several gaskets between the Carb and intake manifold, how many should there be? It is a single exhaust with the around the front of the engine crossover pipe and the exhaust thermostat is on the right side manifold but I have disconnected it. Could any of these issues be a factor?

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PostPosted: Sun Jun 25, 2017 3:51 pm 
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Location: SKANNINGE ,SWEDEN
You need 7 gasket. Single exhaust system will soon or later create problem for pass side liner/pistons.
And exhaust thermostat is hard to control working 100%.
You can demount thermostat and mount a aluminium or steel spacer, I use aluminium on my 239 engine.
It was a reason Ford after 8 month in production change to 272 engine, after several problem ( oil pressure to camshaft bearing and head) and big cost for Ford.
If you have a Fordomatic can you mount dual exhaust manifold and save your engine for future.
Have you make a comp test of cylinders?

I change to 2" dual exhaust on my Skyliner.

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