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Author
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Topic: Idle Help...Please
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Harrys'65
Gearhead Posts: 341
From: Saint Paul, MN
Registered: Sep 99
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posted 10-11-2001 09:20 PM
   
I had a weird problem today, and I need some help. I started the car, and it idled fine, I then drove out my road and had to make a left and 'hit it hard' to get up to speed. From that moment on, the car has run at a very fast idle.(Hard to keep it stopped and when shifting, it really slams.)
Since I have never messed with my idle/carb, any help is appreciated. I have a Holley 4 barrel. Any idea what happened? How do I adjust the idle with this carb? Thanks in advance.
Harry
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franklin
Gearhead Posts: 128
From: VA
Registered: Nov 2000
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posted 10-11-2001 09:34 PM
Since you "hit it hard" the first thought that comes to my mind is the secondaries for some reason didn't close all the way. On holleys, they do contribute to the idle air and fuel, and they have a closed stop adjustment on the passenger side of the carb. Look at the bottom of the secondary vacuum diaphram rod and it should be connected to a little bellcrank that is attached to the secondary butterfly shaft. This bellcrank should be resting against a little screw that comes up out of the base of the carb. If it's not resting on the screw or just to try my theory, jiggle the secondary shaft a little and make sure it is completely closed and then start the car and try it out. Of course there are other things like the choke linkage and the primaries sticking, but your story of hitting it hard leads me to the secondaries.
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Harrys'65
Gearhead Posts: 341
From: Saint Paul, MN
Registered: Sep 99
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posted 10-12-2001 08:41 AM
I will check it out today, thanks Franklin. I am really not up on Carbs, so this one may challenge me. The primaries looked to be OK, and but I did't check and vacuum lines or the choke linkage yet.
If it is the secondary sticking, how do I 'unstick' it?
Thanks
Harry
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franklin
Gearhead Posts: 128
From: VA
Registered: Nov 2000
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posted 10-12-2001 11:10 AM
Grab the lever on the end of the secondary shaft and try to force it closed. If this fixes it, you might need to take the carb off the manifold and clean in and around the secondary butterflies any gum that might be causing this.
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SteveLaRiviere
Administrator Posts: 30756
From: Saco, Maine
Registered: May 99
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posted 10-12-2001 03:31 PM
I would check the fast idle cam behind the choke thermostat. To clean either that or the vacuum secondary linkage, you would use carb cleaner to clean it while you work the linkage back and forth, then follow it up with some WD-40 or similar. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC Be American, Drive American!
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Harrys'65
Gearhead Posts: 341
From: Saint Paul, MN
Registered: Sep 99
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posted 10-12-2001 06:41 PM
You guys are amazing, thank you. I just got back from a 2 hour cruise, on probably the last beautiful day up here.
The secondary stuck, just like Franklin said, and I used Steve's method to fix it.
What would I do without M&M? Thank you both.I need to learn more about my carb, that is the one part of the car I have never messed with. Thanks Again,
Harry
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