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Holley 4150 HP Won't Idle Down #104861
08/14/08 04:08 PM
08/14/08 04:08 PM
Joined: Jan 2003
Posts: 1,019
Eau Claire, WI
ResQ911 Offline OP
super gas
ResQ911  Offline OP
super gas

Joined: Jan 2003
Posts: 1,019
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!!

Re: Holley 4150 HP Won't Idle Down [Re: ResQ911] #104862
08/14/08 04:13 PM
08/14/08 04:13 PM
Joined: Jan 2003
Posts: 2,521
Richmond Va, KeislerTKO 60...
V
VanishPt Offline
master
VanishPt  Offline
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V

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Posts: 2,521
Richmond Va, KeislerTKO 60...
there is the secondary idle screw that you can only get to from the bottom when the carb is off.

Re: Holley 4150 HP Won't Idle Down [Re: ResQ911] #104863
08/14/08 04:50 PM
08/14/08 04:50 PM
Joined: Mar 2008
Posts: 571
Western NC
68Bullit Offline
mopar
68Bullit  Offline
mopar

Joined: Mar 2008
Posts: 571
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.

Re: Holley 4150 HP Won't Idle Down [Re: 68Bullit] #104864
08/14/08 08:01 PM
08/14/08 08:01 PM
Joined: Jan 2005
Posts: 3,312
Marine Corps Base Hawaii
DemonKyle Offline
USMC LCPL
DemonKyle  Offline
USMC LCPL

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Posts: 3,312
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

Re: Holley 4150 HP Won't Idle Down [Re: 68Bullit] #104865
08/14/08 10:06 PM
08/14/08 10:06 PM
Joined: Jan 2003
Posts: 1,019
Eau Claire, WI
ResQ911 Offline OP
super gas
ResQ911  Offline OP
super gas

Joined: Jan 2003
Posts: 1,019
Eau Claire, WI
Tried the throttle lever and no kick-down.............4-speed

Re: Holley 4150 HP Won't Idle Down [Re: ResQ911] #104866
08/14/08 10:21 PM
08/14/08 10:21 PM
Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda Offline
master
70AARcuda  Offline
master

Joined: Jan 2003
Posts: 9,826
las vegas
vacuum leak.............


Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: Holley 4150 HP Won't Idle Down [Re: 70AARcuda] #104867
08/15/08 09:46 AM
08/15/08 09:46 AM
Joined: Jan 2003
Posts: 5,948
British Columbia
C
chrisf Offline
master
chrisf  Offline
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Posts: 5,948
British Columbia
does that model have a choke? if so check that the choke linkage isnt hanging up (fast idle)

Re: Holley 4150 HP Won't Idle Down [Re: chrisf] #104868
08/15/08 02:03 PM
08/15/08 02:03 PM
Joined: Jan 2003
Posts: 1,019
Eau Claire, WI
ResQ911 Offline OP
super gas
ResQ911  Offline OP
super gas

Joined: Jan 2003
Posts: 1,019
Eau Claire, WI
No Choke

Re: Holley 4150 HP Won't Idle Down [Re: ResQ911] #104869
08/15/08 03:22 PM
08/15/08 03:22 PM
Joined: Jan 2007
Posts: 780
Woodinville, WA
Viol8r Offline
super stock
Viol8r  Offline
super stock

Joined: Jan 2007
Posts: 780
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.

Re: Holley 4150 HP Won't Idle Down [Re: Viol8r] #104870
08/15/08 10:01 PM
08/15/08 10:01 PM
Joined: Jan 2003
Posts: 1,019
Eau Claire, WI
ResQ911 Offline OP
super gas
ResQ911  Offline OP
super gas

Joined: Jan 2003
Posts: 1,019
Eau Claire, WI
No vacuum port either.

Re: Holley 4150 HP Won't Idle Down [Re: ResQ911] #104871
08/15/08 10:12 PM
08/15/08 10:12 PM
Joined: Jul 2004
Posts: 4,384
Worst Weather USA
493_DART Offline
master
493_DART  Offline
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Joined: Jul 2004
Posts: 4,384
Worst Weather USA
another vote for a vacuum leak

Re: Holley 4150 HP Won't Idle Down [Re: 493_DART] #104872
08/16/08 12:59 AM
08/16/08 12:59 AM
Joined: Jul 2003
Posts: 2,344
Cincinnati, OH
6
6T6Cuda Offline
top fuel
6T6Cuda  Offline
top fuel
6

Joined: Jul 2003
Posts: 2,344
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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