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Old 11-03-2010, 06:25 PM   #1
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Sorry but more carb help

hey guys i have recently installed the mc2100 i got from that ebay guy on my 4.2 1990 yj. I'm pretty sure I don't have my vac to the pcv port on the carb right. I read somewhere online that a wrangler was smoking because of the pcv being hooked up right. I posted a question earlier about my yj smoking and I'm pretty sure the reason is because of an improper pcv hook up. Right now I have a fram air breather on the rear hole on the valve cover and a vacuum line from that breather to a port that is on the electric choke. The pcv port on the front of the valve cover is currently open with that little elbow (pcv valve?) still in the grommet. My other vacuum lines I have are the line from the distributor that t's and goes to the port on the side and to the Thermal CTS switch. I have the port on the CTS for the canister purge signal capped and the port on the CTS for the EGR is still going to the EGR. I don't see any other ports on the carb besides the distributor advance and two ports on the choke and one right below the air filter on top of the carb. I found this pic
Pcv port mc2100 image by ocdbeetle on Photobucket
and the one labeled 2 is where i have the vacuum line from the rear pcv hooked up to now and the one labeled three is the only other port i see on the carb. Where is the pcv port? pics would be awesome. Also in the instructions the ebay guy sent me in the pcv section he talks about using a port at the throat of the intake instead. Is this the thing thats right below the throttle linkage and right above the EGR? Theres a hose coming from the power brake assist to this thing. It has the port to the power brake assist and another port that sucks in a lot of air at idle and is currently hooked up to a vacuum that goes to a couple of things hooked up right by the firewall. Is this port a port i can use for the pcv instead of a port on the carb? Please help!

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Old 11-03-2010, 11:52 PM   #2
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PCV valve needs a full-time vacuum port, unlike a distributor which needs a ported vacuum source. Ported vacuum source being one that delivers little to no vacuum when the throttle is at the idle position but ramps up as the throttle opens. For this reason the hose from the PCV valve can be hooked up to either a full-time vacuum port on the base of the carb or a vacuum nipple that's just drilled and tapped into the intake manifold.

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Old 11-04-2010, 06:34 AM   #3
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So I can hook up the hose from the rear pcv valve to that thing right above the egr?
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Old 11-05-2010, 12:42 AM   #4
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If that "thing" is a full-time vacuum source, then yes.
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Old 11-05-2010, 04:42 PM   #5
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I found this thread on jeepforum and is this where you mean for me to drill and tap a hole for the pcv? If it is is there like a fitting i can buy so i can attach the hose onto it?
Help with MC2100 - JeepForum.com
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Old 11-05-2010, 10:45 PM   #6
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I ran a 2100 once but it was on a old V8. You shouldn't have to drill it, just run a tee off of the large port at the base. Use the small port in front for your distributor advance.
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Old 11-05-2010, 11:17 PM   #7
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Just bought the same carb from the same guy..Let me know how it runs..Thanks!!
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Old 11-05-2010, 11:55 PM   #8
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I have a mc2150 and as far as I know it is the same as the 2100. On the rear of the carb at the base is a larger metal vacuum tube. That is where the PCV valve hooks.
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Old 11-06-2010, 12:04 AM   #9
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I checked my PDF file on the 2100 and the 2150, and it seems that some do not have the lower hook up. Some had a seperate base plate that the PCV went to.
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Old 11-07-2010, 03:40 PM   #10
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Can you send me those files? I just got time to hook up the pcv to that port right above the egr and the smoke has stopped. But it's still running a little rough especially when I accelerate to 1500. What's could the problem be?
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Old 11-08-2010, 03:03 PM   #11
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Also I've got some black liquid coming out of my exhaust and a tiny bit of smoke too. Could this be an indication of running too rich or too lean?

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