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ResQ911
super gas


Reged: Jan 20 2003
Loc: Eau Claire, WI
Holley 4150 HP Won't Idle Down
      #4618996 - Thu Aug 14 2008 02:08 PM

I can't seem to get my Holley 4150 HP carb to get below 1100-1200 rpm.
Idle speed screw is backed off all the way. Is there another idle screw or ?
Thanks!!


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VanishPt
master


Reged: Jan 20 2003
Loc: Richmond Va, KeislerTKO 60...
Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
      #4619007 - Thu Aug 14 2008 02:13 PM

there is the secondary idle screw that you can only get to from the bottom when the carb is off.

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68Bullit
mopar


Reged: Mar 30 2008
Loc: Western NC
Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
      #4619091 - Thu Aug 14 2008 02:50 PM

Before you remove the carb and try for another adjustment, is the throttle arm making a full forward return while at idle? Remove the throttle cable and see if the throttle arm moves forward any.

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DemonKyle
USMC LCPL


Reged: Jan 04 2005
Loc: Marine Corps Base Hawaii
Re: Holley 4150 HP Won't Idle Down [Re: 68Bullit]
      #4619444 - Thu Aug 14 2008 06:01 PM

Quote:

Before you remove the carb and try for another adjustment, is the throttle arm making a full forward return while at idle? Remove the throttle cable and see if the throttle arm moves forward any.



also try the kickdown rod to make sure it isnt getting hung up

--------------------

SOME PEOPLE COME TO RACE... WE COME TO FIGHT THE WAR...
1971 Dodge Demon FC7...warmed over 360.
Come find me at a stoplite


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ResQ911
super gas


Reged: Jan 20 2003
Loc: Eau Claire, WI
Re: Holley 4150 HP Won't Idle Down [Re: 68Bullit]
      #4619762 - Thu Aug 14 2008 08:06 PM

Tried the throttle lever and no kick-down.............4-speed

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70AARcuda
master


Reged: Jan 20 2003
Loc: las vegas
Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
      #4619806 - Thu Aug 14 2008 08:21 PM

vacuum leak.............

--------------------
Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.335 @ 128.22(10-05-13 Bakersfield on E85)
71 Demon 360 10.720 @120.66 (9-08- 2012 @ Sacramento)
71 Duster 360 (11.050@ 119.12 5/17/14 vegas)
69 Barracuda FB 360 (10.697@123.40MATS 2011 Retired for awhile)


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chrisf
master


Reged: Jan 19 2003
Loc: British Columbia
Re: Holley 4150 HP Won't Idle Down [Re: 70AARcuda]
      #4620561 - Fri Aug 15 2008 07:46 AM

does that model have a choke? if so check that the choke linkage isnt hanging up (fast idle)

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ResQ911
super gas


Reged: Jan 20 2003
Loc: Eau Claire, WI
Re: Holley 4150 HP Won't Idle Down [Re: chrisf]
      #4621156 - Fri Aug 15 2008 12:03 PM

No Choke

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Viol8r
super stock


Reged: Jan 22 2007
Loc: Woodinville, WA
Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
      #4621345 - Fri Aug 15 2008 01:22 PM

there is a vacuum port out the back of the baseplate for PCV or brakes, make sure that is plugged off or if it is being used than you are good.

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ResQ911
super gas


Reged: Jan 20 2003
Loc: Eau Claire, WI
Re: Holley 4150 HP Won't Idle Down [Re: Viol8r]
      #4622182 - Fri Aug 15 2008 08:01 PM

No vacuum port either.

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493_DART
The Beast!!


Reged: Jul 11 2004
Loc: WORST WEATHER IN USA
Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
      #4622204 - Fri Aug 15 2008 08:12 PM

another vote for a vacuum leak

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6T6Cuda
super gas


Reged: Jul 24 2003
Loc: Cincinnati, OH
Re: Holley 4150 HP Won't Idle Down [Re: 493_DART]
      #4622497 - Fri Aug 15 2008 10:59 PM

spray carb cleaner down the air bleads. Make sure they do not have any dirt in them... They will cause you not to get the thing to idle or

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