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#104861 - 08/14/08 02:08 PM Holley 4150 HP Won't Idle Down
ResQ911 Offline
super gas

Registered: 01/20/03
Posts: 1019
Loc: Eau Claire, WI
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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#104862 - 08/14/08 02:13 PM Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
VanishPt Offline
master

Registered: 01/20/03
Posts: 2521
Loc: Richmond Va, KeislerTKO 60...
there is the secondary idle screw that you can only get to from the bottom when the carb is off.

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#104863 - 08/14/08 02:50 PM Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
68Bullit Offline
mopar

Registered: 03/30/08
Posts: 566
Loc: Western NC
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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#104864 - 08/14/08 06:01 PM Re: Holley 4150 HP Won't Idle Down [Re: 68Bullit]
DemonKyle Offline


Registered: 01/04/05
Posts: 3312
Loc: Marine Corps Base Hawaii
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
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#104865 - 08/14/08 08:06 PM Re: Holley 4150 HP Won't Idle Down [Re: 68Bullit]
ResQ911 Offline
super gas

Registered: 01/20/03
Posts: 1019
Loc: Eau Claire, WI
Tried the throttle lever and no kick-down.............4-speed

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#104866 - 08/14/08 08:21 PM Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
70AARcuda Offline
master

Registered: 01/20/03
Posts: 9117
Loc: las vegas
vacuum leak.............
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Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14Bakersfield) 71 Demon 360 10.720 @120.66 (9-08- 2012 @ Sacramento) 71 Duster 360 (10.65 @ 123.22 10/04/14 Bakersfield)

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#104867 - 08/15/08 07:46 AM Re: Holley 4150 HP Won't Idle Down [Re: 70AARcuda]
chrisf Offline
master

Registered: 01/19/03
Posts: 5536
Loc: British Columbia
does that model have a choke? if so check that the choke linkage isnt hanging up (fast idle)

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#104868 - 08/15/08 12:03 PM Re: Holley 4150 HP Won't Idle Down [Re: chrisf]
ResQ911 Offline
super gas

Registered: 01/20/03
Posts: 1019
Loc: Eau Claire, WI
No Choke

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#104869 - 08/15/08 01:22 PM Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
Viol8r Offline
super stock

Registered: 01/22/07
Posts: 774
Loc: Woodinville, WA
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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#104870 - 08/15/08 08:01 PM Re: Holley 4150 HP Won't Idle Down [Re: Viol8r]
ResQ911 Offline
super gas

Registered: 01/20/03
Posts: 1019
Loc: Eau Claire, WI
No vacuum port either.

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#104871 - 08/15/08 08:12 PM Re: Holley 4150 HP Won't Idle Down [Re: ResQ911]
493_DART Offline


Registered: 07/11/04
Posts: 4233
Loc: WORST WEATHER IN USA
another vote for a vacuum leak

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#104872 - 08/15/08 10:59 PM Re: Holley 4150 HP Won't Idle Down [Re: 493_DART]
6T6Cuda Offline
super gas

Registered: 07/24/03
Posts: 2209
Loc: Cincinnati, OH
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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