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Unread 04-19-2013, 04:54 PM   #1
Njokela
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1977 FSJ Wagoneer 
 
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Carb tuning...again?

Ok guys turning to your help and input yet again. Finally got my waggy running, and then one day she died on me. Only thing I can think of is she over heated....with my foot off the brake I would do 45-50 without touching the gas. Now I tuned the screw on the drivers side right by the throttle cable (motorcraft 2100, 2 bbl) and got my rpms down to the appropriate 1,600 at idle in park. Now where I need the help is, when I put it in drive, the rpms only go down to 1,000 but should be 550. There is a screw right behind/under the hot air choke on the drivers side that I tried adjusting to bring them down....nothing. Only the screw on the drivers side seems to be effecting the rpms. I read somewhere there needs to be and idle stop screw adjusted to the second step, but can't figure that out either. Any help or a step by step guide with pics would be awesome. Thanks again guys.



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Unread 04-20-2013, 01:18 PM   #2
Dngrs1
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Why do you think it overheated?
1600 RPM is way to high for idle in Park; 650-750 is more appropriate. If your still running the original Prestolite ignition, it will randomly die on you before it totally gives up the ghost.
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Unread 04-20-2013, 01:27 PM   #3
Njokela
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In the Haynes manual it says that idle rpms should be 1600, is that only upon start up? I'm assuming my idle stop screw is not set at the second step. After the engine is warm it should be idling a lot lower? I'm jus confused which screws to turn to get what I need. I have read a lot of tutorials online but none have any good pictures about which screws to turn when and what the rpm readout should be. I think it over heated because the engine died completely and wouldn't start. After a few hours of completely cooling down, she would start right up. That's when I hooked the tach back up and it was maxed out at idle in park...
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Unread 04-20-2013, 01:55 PM   #4
Dngrs1
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Chilton's says 700RPM for a '77 with a 360 and auto. As my '77 J-10 came with a MC 4350 4bbl and now has a Qjet, I am not familiar with the adjustments on a 2100. Sorry. Chilton's says the idle is adjusted with the idle stop solenoid adjusting screw, if that helps. Maybe someone that has a 2100 will post up a pic of where that is.
The idle should be adjusted when the engine is warm. There should be a high idle adjustment for when the choke is on.
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Unread 04-20-2013, 02:44 PM   #5
RockRollin
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1st is choke high idle. Make sure choke is pulling off
2nd Is solenoid stop. For now thread this out so it doesn't contact
3rd is warm (normal) idle. Adjust so idle is 650-700
I realize this is a 2150, but it should be much the same.

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Unread 04-20-2013, 08:47 PM   #6
Njokela
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So for number 2 the normal idle, is that idle in park or idle in drive?
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Unread 04-20-2013, 08:48 PM   #7
Njokela
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Quote:
Originally Posted by Njokela
So for number 2 the normal idle, is that idle in park or idle in drive?
Sorry I meant number 3
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Unread 04-21-2013, 05:35 AM   #8
RockRollin
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700rpm in drive
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Unread 10-25-2013, 01:03 AM   #9
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I bought a New billet aluminum Insulator for my 1977 j10 4350 MotorCraft Carburetor and OEM intake manifold with top and bottom gaskets from these guys and it works better than anything Jeep ever produced, However it was not cheap.
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