1967 Ford F-250 loading up

Tiny
DADS 67
  • MEMBER
  • 1967 FORD F-250
  • 6.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Dear sirs
I inherited my dads 1967 ford f250 2wd with a transplanted 390 cid and a C6 automatic I have been fighting the timing in it has kept burning the point and that is fixed now then the carb started loading up and I rebuilt that and it was running
Now it will idle and then slowly load up after 10 mins but it will clear out if I raise the engine speed
once it clears out it will load up again and I can clear it out again
not when it is running at a higher RPM than idle if I put it in gear it will load up and back fire and cough and die
do I have a modulator issue?
is it something when the trans is engaged that it will leak air?
but why does it load up and back fire?

Thank you so much for your time

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Monday, March 10th, 2014 AT 6:49 AM

3 Replies

Tiny
HMAC300
  • EXPERT
The carb may have a float level set to high and maybe some timing issues. As well as other things. What kind of carb is on it and check vacuum lines for leakage especially to trans as the one going to modulator would get oil on it and go soft and suck together. But iti si probably more carb related so let us know what kind it is and model if you can find that.
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Monday, March 10th, 2014 AT 7:08 AM
Tiny
DADS 67
  • MEMBER
Dear sirs I believe it is an autolite 2100 2 bbl but why would it idle high and clear out then fall on its face and back fire when the trans is engaged?
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Monday, March 10th, 2014 AT 7:12 AM
Tiny
HMAC300
  • EXPERT
It does that because it 's not getting enough fuel then it does. See the pics I've sent the numbers on carb settings are for dry float and wet float. Check to see that float will actually float and not sink as that may be your problem with loading up put it in a jar of gas for about 10 minutes if it sinks then replace it. Check inside distributor where vacuum advance arm hooks up to dist breaker plate if either are worn replace worn part also check breaker plate for moving sideways an dnot moving correctly off of rotation point they wear there as well. Also if single point setdwell with dwell meter at 30 degrees fords ran best there and make sure to put a little bit of lube on cam for points as they will wear quickly without and screw up timing. Timing shold be set at 6-10 degrees whichever you like and gives least amount of spark knock higher timing will give better power. Also check firing order after you did all of this then let me know if you still have the problem.
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Monday, March 10th, 2014 AT 7:28 AM

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