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Author Topic:   Autolite 4100 tuning question
deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 11-17-2002 09:52 PM     Click Here to See the Profile for deadhead   Click Here to Email deadhead     Edit/Delete Message   Reply w/Quote
I've got her idling and driveable. She's pretty smooth down to about 1100 rpms in PARK, but that's about as low as she'll go and still run stopped in DRIVE. I figure she's turning about 850 to 900 at a light. Still too high for casual driving, and she seems to be eatin' gas, too. All the idle rpm adjustments I've been making have been with timing--the idle speed screw is all the way out. I've got the idle mixture screws at one-and-a-half turns out. She won't start with the choke on even a little, but starts pretty well without it. I've got a Holley #5 power valve, and #53 and #59 jets.

Is it okay for the idle speed screw to be all the way out as I try to tune her in or should it have some preload? Does its behavior with the choke indicate my idle system is too rich? Any other hints to get her to idle at a lower rpm?

deadhead

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1_ZoNiE
Gearhead

Posts: 490
From: Arizona - M&M Member No. 1968 & Owner/Driver of a 1968 Mustang Coupe! ~Happiness is Matching Numbers~
Registered: Mar 2002

posted 11-18-2002 08:58 AM     Click Here to See the Profile for 1_ZoNiE   Click Here to Email 1_ZoNiE     Edit/Delete Message   Reply w/Quote
I have an idea that might be a wild stab in the dark. But, are the secondaries completely close when the engine idles? Or better yet do they stick when you ease them open by hand?

------------------
Jim

68 Mustang Coupe...My Show Car.
Winning over 50 awards!

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 11-18-2002 09:17 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The secondary throttle blades ARE adjustable you know.
YOu have to take the carb off and turn it upside down.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

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deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 11-19-2002 12:34 AM     Click Here to See the Profile for deadhead   Click Here to Email deadhead     Edit/Delete Message   Reply w/Quote
Alex,

deadhead typing to you from San Diego.

The Shop Manual doesn't say anything about using the secondary preload as a tuning item.

With the right tool, you don't have to take anything off.

ATP

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 11-19-2002 08:18 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Well if you have the shop manual, what do you need us for?

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

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Tim65GT
Journeyman

Posts: 5
From: Lexington, KY, USA
Registered: Oct 2002

posted 11-19-2002 03:01 PM     Click Here to See the Profile for Tim65GT   Click Here to Email Tim65GT     Edit/Delete Message   Reply w/Quote
I've been following this carb debacle for awhile now, and I thought I might make a suggestion. I've got a Holley on my 289, but I was having the same kind of problems. It would idle for a few seconds and then die unless you fanned the pedal. I figured I had a vacuum leak but could not find anything. Then I thought about the PCV valve. I pulled it out and plugged the hose and everything was cool ! So I replaced the PCV valve with a new one from NAPA and it idles nicely. Also I have my secondary plates adjusted just slightly cracked (about 3/4 of a screw turn off of being completely closed). Hope this helps.

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 11-19-2002 03:19 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Welcome to M&M Tim !

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

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deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 11-19-2002 09:02 PM     Click Here to See the Profile for deadhead   Click Here to Email deadhead     Edit/Delete Message   Reply w/Quote
Alex,

I didn't mean that as a jab, just that the Shop Manual didn't mention "adjusting" the secondary opening as part of the tuning process.

I'm hoping experience can supplement the manual. Otherwise, who needs this forum.

deadhead

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deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 11-19-2002 09:02 PM     Click Here to See the Profile for deadhead   Click Here to Email deadhead     Edit/Delete Message   Reply w/Quote
Alex,

I didn't mean that as a jab, just that the Shop Manual didn't mention "adjusting" the secondary opening as part of the tuning process.

I'm hoping experience can supplement the manual. Otherwise, who needs this forum.

deadhead

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 11-19-2002 10:35 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
And actually my friend, who needs you if you are going to have that attitude?
You think that I do this sh*t just to see my name in print?

If you seek advice here you have the option of taking it or not.
Don't second guess it.
YOU DO NOT HAVE THAT OPTION!
All members offer help, aid, or advice in good faith and deserve a little respect in return. NO more, no less.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

[This message has been edited by Moneymaker (edited 11-19-2002).]

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deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 11-20-2002 01:43 AM     Click Here to See the Profile for deadhead   Click Here to Email deadhead     Edit/Delete Message   Reply w/Quote
Gee, Alex,

the "Well if you have the shop manual, what do you need us for?" line seemed unnecessary, too.

Your advice is no longer needed.

deadhead

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 11-20-2002 09:49 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I will offer up one more piece of advice on this issue for everyone whether they want it or not.
Never try to do to do mental intensive work on you classic while impared. Booze or drugs should not be part of your tool box.

Start drinking, stop working!!!

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

IP: Logged

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