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Old 11-16-2012, 08:42 AM   #16
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Default Re: Carb problem. Car won't idle in gear.

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I had the same prob with a new carb. I called the builder and removed some type of screw he had installed and it ran fine after that. It was a few years ago and i can't remember what it was called and i am the furthest thing from a carb expert, sorry.
My Pro-Systems had that same secondary idle circuit. When I was having an issue Patrick told me to remove it. Difference was night and day!
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Old 11-16-2012, 08:47 AM   #17
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Default Re: Carb problem. Car won't idle in gear.

Whats the timing set at? Sounds like very low timing to me and your trying to compensate with carb settings. JMO
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Old 11-16-2012, 08:48 AM   #18
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Default Re: Carb problem. Car won't idle in gear.

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look at the tach when it drops in gear and see how far the rpm drops...on mine it runs till it hits 1200 rpm but if the rpm drops below 7 it resets..what system is on it and i will look to see in my files on what his syatems works like
It's a 7531 box. The carb is a Quickfuel Dominator with billet this and that and 3 adjustable bleeds next to each venturi. Converter spacing is perfect (I put this car all together and I know to make sure it's correct). Converter is not too tight, in fact it's much looser than the first one we had in it but still does the same thing. I agree with those saying it's too lean. We looked for vacuum leaks but not real intensively. The intake was recently off to add a second fogger to it so it's possible.
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Old 11-16-2012, 08:49 AM   #19
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Default Re: Carb problem. Car won't idle in gear.

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My Pro-Systems had that same secondary idle circuit. When I was having an issue Patrick told me to remove it. Difference was night and day!

YUP!!! That was it. I also had a Pro Systems.
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Old 11-16-2012, 08:50 AM   #20
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Default Re: Carb problem. Car won't idle in gear.

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Whats the timing set at? Sounds like very low timing to me and your trying to compensate with carb settings. JMO

agree with that...also the front butterflies might be opened up pass the idle transfer slots...might help to open your rears a bit more

possibly small holes needed in the butterflies?????
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Old 11-16-2012, 08:53 AM   #21
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Default Re: Carb problem. Car won't idle in gear.

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Whats the timing set at? Sounds like very low timing to me and your trying to compensate with carb settings. JMO
36 degrees total,locked.
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Old 11-16-2012, 09:17 AM   #22
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Default Re: Carb problem. Car won't idle in gear.

I am thinking it somehow needs more fuel down low??? But I know nothing about carbs......Dan, lets make it fuel injected!!!! Then I can help..
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Old 11-16-2012, 09:22 AM   #23
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Default Re: Carb problem. Car won't idle in gear.

I had problems with a MSD box last year. What I thought was 36* was actually 11*
Im guessing it would retard 25* at startup and never return to full setting.

When cking with light it showed 36* After changing box (didnt touch the dist.) It showed 11*

Changed out the box (after MSD cked it and said nothing was wrong with it) and problem solved.
Hope this helps.
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Old 11-16-2012, 09:26 AM   #24
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Default Re: Carb problem. Car won't idle in gear.

2 1/2 turns out on the idle screws sounds as that damn thing should be bloody rich at idle.....what is the idle egt. temp....im going with vacume leak somewhere do the ole wd 40 test see if motor revs when u spray it around intake or carb....
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Old 11-16-2012, 09:32 AM   #25
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Default Re: Carb problem. Car won't idle in gear.

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Originally Posted by 55sedan View Post
I had problems with a MSD box last year. What I thought was 36* was actually 11*
Im guessing it would retard 25* at startup and never return to full setting.

When cking with light it showed 36* After changing box (didnt touch the dist.) It showed 11*

Changed out the box (after MSD cked it and said nothing was wrong with it) and problem solved.
Hope this helps.
We've ran the car so far on one 200hp stage and it ran 5.09. The box is new and I don't believe it's the problem. It use to idle fine in and out of gear till the intake was pulled and re-installed. (done by someone else) so it's very likely it could be a vacuum leak. That will probably be my first thing to check.
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Old 11-16-2012, 09:34 AM   #26
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Default Re: Carb problem. Car won't idle in gear.

Does the idle change much or at all when you turn the idle mixture screws ? Like was mentioned earlier, make sure the throttle blades are adjusted so that at idle they have the same gap between the blade and the body, you may have to close up the primary and open the secondary or vise versa. If adjusting the idle screws don't change the idle much then it may be because you have over exposed the idle slots. Because the blades are open to far, it doesn't allow the carbs idle circuit to properly draw fuel through the idle slots. You can remedy that by drilling a small hole near the air cleaner boss and threading it for an air bleed. This will allow you to close up the throttle blades and still provide additional air as if they were still open. The air bleed allows you to adjust the amount of additional air without having to drill the hole larger and larger until you get it right.
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Old 11-16-2012, 09:41 AM   #27
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Default Re: Carb problem. Car won't idle in gear.

Does it have a vacum pump? If so the guy might have forgot to glue the intake gaskets in place. It might have sucked the gasket out the bottom of the intake
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We've ran the car so far on one 200hp stage and it ran 5.09. The box is new and I don't believe it's the problem. It use to idle fine in and out of gear till the intake was pulled and re-installed. (done by someone else) so it's very likely it could be a vacuum leak. That will probably be my first thing to check.
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Old 11-16-2012, 09:52 AM   #28
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Default Re: Carb problem. Car won't idle in gear.

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Originally Posted by Dan Neumann View Post
It use to idle fine in and out of gear till the intake was pulled and re-installed. (done by someone else) so it's very likely it could be a vacuum leak. That will probably be my first thing to check.
I agree, sounds like your headed in the right direction.
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Old 11-16-2012, 09:56 AM   #29
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Default Re: Carb problem. Car won't idle in gear.

Pull the intake.....you have a vacuum leak
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Old 11-16-2012, 09:59 AM   #30
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Default Re: Carb problem. Car won't idle in gear.

On that box the retard is automatic on start retard it stops at800rpm and resets when it drops below 500..just use the kiss method and you will find it even if it is a vacume leak break out the carb cleaner while its running it it will find it easy enough
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