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1981 f150 351m carberated wont idle cold very rough hot but will idle erratic

Has rebuilt eng new carb new plugs wires fuel pump fuel filter air filter smog pump removed

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 33 Answers

SOURCE: 1984 chevy s10 2.8l rochester carberator.

check all the vacuum lines and make sure there are no leaks, i had the same problem an thats all it was

Posted on Jan 08, 2009

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yotaguy
  • 232 Answers

SOURCE: 1985 toyota pickup.22r,automatic trans,2 barrel

There ar two thermo vacuum switches on the intake manifold,one in the center top by the EGR pipe right next to the valve cover,and one center bottom on the outside right below the carburator,it may be that one of them is not fully opening/closing when the motor is cold.I'm not sure on this as I've never had this problem with my 22R's,hopefully this will point you in the right direction,if you want comment back and I'll research this further(it's 5 in the morn and I cant access my 22r manual)

Posted on May 01, 2009

  • 125 Answers

SOURCE: engine rough idle cold. passes smog once temp reaches thermostat

you can take apart the top section and blow out the small passage that's bellow the throttle plate.

Posted on May 01, 2009

  • 6 Answers

SOURCE: 22r carb dumping fuel at 2500 rpm will not pass

have you checked you fuel pressure regulator as some times as you rev the engine the fuel pressure will over fill the bowl or even simpler your fuel bowl shut valve may need re setting

Posted on Sep 19, 2009

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