Missing at idle - JeepForum.com

 
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post #1 of 6 Old 04-03-2013, 02:24 PM Thread Starter
merrell056
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1990 YJ Wrangler 
 
Join Date: Mar 2013
Location: phoenix
Posts: 11
Missing at idle

Hi everyone. I recently bought a YJ with a weber carb. It has been nuttered. It had an exhaust leak so I pulled the manifolds and replaced the cracked exhaust manifold. I also pulled the valve cover to clean it and replace the valve cover gasket.


The problem I am having is that at idle the motor misses and dies. When revving it has no issues whatsoever. Here is the list of what I have done so far to try and fix it. I am at my wits end and hope you all can help me.

1. New distributor cap, rotor, plugs, and wires.
2. Checked all post nutter vacuum lines based on threads I have searched on these forums.
3. I have some extra electrical sitting in the engine compartment that I haven't had a chance to get to. It is all pre-nutter wiring.
4. Went through all 6 plugs and disconnected them all 1 by 1 and the missing was worse on each of them. No single plug seems to be the problem. Plus when i rev the motor it does not miss at all. It does when I revved with each of the spark plugs disconnected.


Could this be a problem with the EGR valve? Timing? I have been searching the forums for hours. Maybe I'm not searching for the right thing but I'm about to tear my hair out.

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post #2 of 6 Old 04-03-2013, 02:26 PM
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
What were your latest compression test readings?

What is your vacuum at idle? Needle steady or moving?

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #3 of 6 Old 04-03-2013, 02:36 PM Thread Starter
merrell056
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1990 YJ Wrangler 
 
Join Date: Mar 2013
Location: phoenix
Posts: 11
Quote:
Originally Posted by Old4X View Post
What were your latest compression test readings?

What is your vacuum at idle? Needle steady or moving?
I don't have the tools to test but I can get them. It idled just fine before I changed out the manifold.
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post #4 of 6 Old 04-03-2013, 02:52 PM
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
Quote:
Originally Posted by merrell056 View Post
I don't have the tools to test but I can get them. It idled just fine before I changed out the manifold.
That really points to a vacuum leak

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #5 of 6 Old 04-03-2013, 03:09 PM Thread Starter
merrell056
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1990 YJ Wrangler 
 
Join Date: Mar 2013
Location: phoenix
Posts: 11
I will go over my vacuum work again.
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post #6 of 6 Old 04-03-2013, 04:18 PM Thread Starter
merrell056
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1990 YJ Wrangler 
 
Join Date: Mar 2013
Location: phoenix
Posts: 11
I found that one of the distributor to CTO valve ports was broken on the CTO valve. Anyone know where I can find one? Dealership isn't answering, of course, and it doesn't seem to be anywhere on the local autopart stores' websites.
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