81 CJ7 Carter BBD To upgrade or not to upgrade? - Page 2 - JeepForum.com
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post #16 of 34 Old 06-24-2013, 07:37 PM Thread Starter
KnoxButler
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1981 CJ7 
 
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Tell you what... Im blown away by how much of a difference the venturi clean out made. The idles almost perfect! A few small hiccups but I think that that's just a idle mixture screws, but other than that its perfect! Thank you so much.

Now I still have a bit of a fluttering when I hold it at a higher rpm, could that be the mixture screws too? Anyway I think im going to tackle the vacuum hoses tomorrow and ill let you know if that has any effect.

Thank you again
-Knox

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post #17 of 34 Old 06-24-2013, 07:37 PM
pman
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Knox-
I've run the Carter BBD on my 4.2l for 25 years. I actually have it running as smooth today as when I drove it off the dealer lot. Great advise on the idle tube fix (this can be done without removing the whole carb). In addition to the clogged idle tubes, other causes for your symptoms are with vacuum leaks. I use carb cleaner to identify leaks (some folks get nervous about fire, but I've used it for years-knock on wood-with nary a problem). Check for a leak at the EGR valve as well. This is a sneakly little spot for a leak that will leave you scratching your head.

As long as the throttle shaft isn't wallowed out, you CAN get the Carter idling well. And don't be afraid to yank that sucker off and rebuild it. They're not near as complex as you would think.

Keep us posted!

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post #18 of 34 Old 06-25-2013, 01:02 AM Thread Starter
KnoxButler
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Hey pman, yes I'm really happy with my results after cleaning out the "idle tubes". I think I'm still going to post some pictures of my carb. maybe a video of its operation, just to confirm that everything looks like its working relatively like it should.

About the vacuum leaks, as iv said before I plan on replacing the lines. However what you said about the EGR valve caught my eye because iv noticed that mine has no line even running to it.

Anyway hopefully I manage to do a good job replacing the vacuum lines. When you check for leaks with carb. cleaner... are you spraying it on the lines and looking for bubbles? If so could you use soppy water, or would you be concerned with getting it in the carb. and thus into the engine?

-Knox
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post #19 of 34 Old 06-25-2013, 02:36 AM
John Strenk
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No, Vacuum sucks so soapy bubbles won't work as well.
When you use sprays and such to check for leaks, you are looking for a change in RPM or smoothness in the idle. Any change will indicate an area were there is a leak.

I just switched from a YF to a BBD and I'm happy so far.

Make sure your throttle bushings are good. I had remarkable results after getting them fixed.
http://www.youtube.com/watch?feature...&v=MmCF9Pop_wc
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post #20 of 34 Old 06-25-2013, 04:02 AM
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The stepper BBD baseplates seem to be made of a softer material then the non-stepper plates.

His choke isn't working I believe too. But fixing vacuum lines and leaks are more important.

Go to my YouTube channel "EugeneKingify" and watch the choke operation videos.
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post #21 of 34 Old 06-25-2013, 10:06 AM
LumpyGrits
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I have had very good luck using very-soapy water to find vac. leaks.
Just got to watch the bubbles and listen for an rpm change. I also use a tach for the vac. leak test/hunt.
LG
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post #22 of 34 Old 06-25-2013, 10:12 AM
John Strenk
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Quote:
Originally Posted by LumpyGrits View Post
I have had very good luck using very-soapy water to find vac. leaks.
Just got to watch the bubbles and listen for an rpm change. I also use a tach for the vac. leak test/hunt.
LG

I guess if it's very soapy.
do the bubble disappear?

Next time I get a leak, I'll have to try it and get a video. Maybe I'll try an old rotted vacuum hose and see what happens.
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post #23 of 34 Old 06-25-2013, 10:29 AM
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Yes, you can see them get sucked in.
You will also hear the rpms change for a bit because of the sealing action of the soapy water. The rpms can go up or down depending on how much got sucked inside.
I mix it just thick enought to be able to spray it.
John-Would really like to see that vid


TO the OP-Take some carb cleaner and flush out the stepper motor area where you see the pins. A small piece of crud can jam them just like the v'cluster. ALSO, made sure the ele. plug on the stepper motor is clean with good contacts to the harness.

LG
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post #24 of 34 Old 06-25-2013, 10:32 AM Thread Starter
KnoxButler
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Im going to fix the vacuum today and see what happens, after that ill check out 86cjs video on chokes.

Thanks guys
-Knox
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post #25 of 34 Old 06-25-2013, 11:20 AM Thread Starter
KnoxButler
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Could anyone help me find my EGR CTO valve I cant seem to find it, or where it should be rather.

-Knox
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post #26 of 34 Old 06-25-2013, 11:24 AM
walkerhoundvm
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The EGR is the bell shaped thing on your intake manifold, right under the carb:



The CTO is a funny looking thing just forward of the EGR on the manifold. Cylindrical, with 2-5 ports coming out of the top of it. Sorta like this:

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post #27 of 34 Old 06-25-2013, 11:35 AM Thread Starter
KnoxButler
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Ok I dont have a CTO, what are my next steps? I dont even see a spot where it should screw into...

-Knox
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post #28 of 34 Old 06-25-2013, 11:48 AM
LumpyGrits
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Is this a 49 state Jeep or Ca. model?
LG
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post #29 of 34 Old 06-25-2013, 12:09 PM Thread Starter
KnoxButler
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No idea, how do i tell?

-Knox
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post #30 of 34 Old 06-25-2013, 12:45 PM
LumpyGrits
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Quote:
Originally Posted by KnoxButler View Post
No idea, how do i tell?

-Knox
IIRC-it's coded in the VIN. Don't remember the code.....
LG
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