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Old 12-19-2005, 08:54 PM
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Default Good carb tuning shop?

I need my Fj-40 to pass emissions... It has a header on it and a non USA carb with a nonUSA disti.

It smokes a little bit...WIthout an O2 sensor it is very difficult to get it tuned in just right... anyone know of a good shop in the denver area that does that kind of stuff?

Thanks,

---JIM
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Old 12-19-2005, 09:02 PM
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Here is a link that will give you an easy method to tune it your self. It's pretty easy. May want to use some carb cleaner as well.

http://forum.ih8mud.com/showthread.php?t=26635
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Old 12-19-2005, 10:15 PM
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Lightbulb Try these guys...

These guys help me pass emissions annually:
Toy Car Care
They are just past Centennial airport.
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Old 12-20-2005, 10:05 AM
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I have a pretty good detailed explaination of how to tune a carb with timing. Which should be done together. I looked for it last night on my comp but I think I actually have a hard copy in my 40 folder. I'll see if I can post it up. My 64 blew easily.. I'm sure your 76 shouldn't be a big deal.
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Old 12-20-2005, 12:19 PM
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I've used the vacuum method, it works okay. As noted in Ken's post, make sure you've dealt with any vacuum leaks first, always work on it at proper operating temperature, and tweak your timing first. Another method I use is:

(1) Screw mixture all the way in. Then back it out 1.5 turns.
(2) Start truck. Increase idle adjust if it won't stay running.
(3) Back out (richen) mixture and listen to RPMs increase. When they don't increase any more, you're there. If you feel like it, go one more half turn to compensate for not having the air cleaner on. I really don't think it makes that much difference in the real world.
(4) Turn idle back down.

Note that the 2 barrel Aisan carb has a "choke breaker". As soon as the truck starts and a vacuum is made, the vacuum actuates a diaphragm which opens the choke just enough to allow some air in. So when you do adjust your choke, you don't have to worry about leaving a gap when the choke is closed. Also note that there is a separate, fast idle adjustment which is only active when the choke is closed. Like the regular idle adjustment, it's on the linkage behind the carb. I know there's a factory spec for the RPM, but just tweak it until it runs good when it's cold, and not doing anything when the choke is open.

Emissions notes: If you're too lean, you won't pass emissions due to "lean misfire". Turning the idle up above spec will help get you lower numbers. While running more advance than factory spec. 7° BTDC will normally get you better power and mileage, for emissions you want to retard it back to spec. No idea why, but you get better numbers, even though power and mileage suck. You can always put everything back after you've passed.
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Old 12-20-2005, 12:39 PM
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That looks familiar

I was reading a great article about a power steering conversion the other day and I didn't even realize it was Ken until the very end.
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Old 12-20-2005, 03:41 PM
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Quote:
Originally Posted by treerootCO
I was reading a great article about a power steering conversion the other day and I didn't even realize it was Ken until the very end.
You mean this one?

http://forum.ih8mud.com/showthread.php?t=65318

Thanks for the compliment
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Old 12-20-2005, 07:24 PM
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how many write up do you have in the technical links
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Old 12-20-2005, 08:31 PM
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Quote:
Originally Posted by 74fj40
how many write up do you have in the technical links
A few, but I am not as skilled as most of the others here. When I did something, I would do a search and put bits and pieces together. When I did the work, I would take pictures and document what I did so the next guy could learn from me. I found it very helpful when someone had done a detailed write-up on how to do something, I am just returning the favor in areas I did not see a comprehensive write-up. You should do the same as you work on your rig. Others will really appreciate it.


Back on the emissions, make sure when you pass you get the 5 Year collector plate so you never have to get an emissions test again.
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Old 12-21-2005, 08:27 AM
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Quote:
Originally Posted by 74fj40
how many write up do you have in the technical links
Back when Woody first started his site, about a quarter of the tech links were to articles on my site. He's got quite a few more now.
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