Runs smooth with choke on when choke is off revs up and down

KEVOO71

MEMBER
1974 FORD FALCON
4.0L
6 CYL
RWD
AUTOMATIC
238,000 MILES

I have a 1973 xa ford falcon starts up good with the choke on when warm and I take choke off idles up and down isn't a consistant idle can you help

Friday, May 9th, 2014 AT 5:47 PM

9 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Have you checked for vacuum leaks? Does it have a manual or automatic choke?

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Saturday, May 10th, 2014 AT 6:36 PM

KEVOO71

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5 POSTS

Yes it does

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Saturday, May 10th, 2014 AT 7:26 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Check the points. I have seen the spring on them get weak and as a result, the timing would change. Also, check the throttle plate for play. The rod that holds it may be worn and causing a leak.

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Sunday, May 11th, 2014 AT 12:53 PM

KEVOO71

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5 POSTS

Checked them they are ok but have a constant idle now adjusted mixture and throttle screw now I have a dead spot just as I start to push down on the pedal its fine then I get a dead spot sort of goes to die and then revs maybe when I put air cleaner on and take it for a run it mite sort it fingers crossed

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Sunday, May 11th, 2014 AT 1:40 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Chances are it still needs some fine tuning with the air / fuel mixture. You may want to try that if there is still a dead spot. Also, make sure the accelerator pump is working properly.

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Monday, May 12th, 2014 AT 8:48 AM