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Idle mixture screw has no effect! #59881 05/19/08 08:39 PM 05/19/08 08:39 PM
Joined: Sep 2005 Posts: 1,202 California P polkat OP mopar addict
polkat OP mopar addict P Joined: Sep 2005 Posts: 1,202 California	Had a problem with my idle mixture screws a few days back. While working on it today to get the best idle, I have discovered that the drivers side idle mixture screw has little or no effect. The passenger side works fine. I'm thinking some kind of dirt or debrie in the driver's side circuit. Any other opinions? Thanks!

Re: Idle mixture screw has no effect! [Re: polkat] #59882 05/19/08 08:48 PM 05/19/08 08:48 PM
Joined: Nov 2007 Posts: 21,814 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,814 Kirkland, Washington	If single plane manifold the entire engine may be idling on the one idle circuit (passenger in your example). YOu may also be able to richen the drive side and then crank down the passenger side and have the same effect. You could have a blown power valve. You could have a clogged air bleed. Is it idling rich???

Re: Idle mixture screw has no effect! [Re: Pacnorthcuda] #59883 05/19/08 09:00 PM 05/19/08 09:00 PM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: If single plane manifold the entire engine may be idling on the one idle circuit (passenger in your example). YOu may also be able to richen the drive side and then crank down the passenger side and have the same effect. You could have a blown power valve. You could have a clogged air bleed. Is it idling rich??? Both screws should be turned out the same amount. Start with the screws about 1-1/2 turns out. Turn them in or out 1/8 turn at a time. If you can turn them both in all the way, then either you have a clogged air bleed, air bleed is too small, or the idle feed restrictor is too big.

Re: Idle mixture screw has no effect! [Re: polkat] #59884 05/19/08 09:25 PM 05/19/08 09:25 PM
A Anonymous Unregistered
Anonymous Unregistered A	no opinion here until you say what kinda carb you have, and any other relevant info.

Re: Idle mixture screw has no effect! [Re: polkat] #59885 05/19/08 09:28 PM 05/19/08 09:28 PM
Joined: Apr 2008 Posts: 1,195 Snowing in the north! D Dart 340 moparts member
Dart 340 moparts member D Joined: Apr 2008 Posts: 1,195 Snowing in the north!	Quote: Had a problem with my idle mixture screws a few days back. While working on it today to get the best idle, I have discovered that the drivers side idle mixture screw has little or no effect. The passenger side works fine. I'm thinking some kind of dirt or debrie in the driver's side circuit. Any other opinions? Thanks! My holley had too much of the transfer slots exposed so the idle did nothing. I have a single plane manifold with a high lift cam designed to only pull 10 InHg at idle. Do a search for tuning carbs and you will find a ton of info on here.

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