304 runs like crap when hot - JeepForum.com
 
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post #1 of 6 Old 08-14-2009, 06:17 AM Thread Starter
jhagerman
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1976 CJ7 
 
Join Date: Jul 2009
Location: Cincinnati
Posts: 12
304 runs like crap when hot

My CJ7 project (almost roadworthy now) runs pretty well until it heats up. It sputters at low RPMs and even dies sometimes. When hot, it idles high when in park or Neutral, but almost dies when idling in gear (auto trans). Have checked the timing (5 degrees BTDC in neutral with vacuum line to distributor detached and capped). Do I have an ignition problem or carburetor (Edelbrock, no idea what model) problem?

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post #2 of 6 Old 08-14-2009, 11:14 AM
swatson454
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1983 CJ7 
 
Join Date: May 2009
Location: Texas Hill Country
Posts: 6,302
I would start first making sure that every possible source of a vacuum leak is eliminated. Base gasket, hoses, tees, manifold fittings and intake gasket... all of it. See what you can find out and we'll go from there
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post #3 of 6 Old 08-14-2009, 12:06 PM Thread Starter
jhagerman
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1976 CJ7 
 
Join Date: Jul 2009
Location: Cincinnati
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Is there a way to eliminate all vacuum except advance on Carb? This thing did not run when I bought it, and I'm not sure it ever ran right with all currently installed/un-installed parts. At least one vacuum line has a screw in it to cap it off, the valve covers are aftermarket, I believe an air pump was once part of the factory equipment (part of power steering bracket is hacked off where I believe ot once resided), aftermarket carb, etc. What do I do here?
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post #4 of 6 Old 08-14-2009, 12:20 PM
Andy5150
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2003 TJ Wrangler 
 
Join Date: Nov 2005
Location: Palm Harbor, Fl.
Posts: 659
If it runs good cold, and gets bad as it warms, I would think its running rich. Maybe a stuck or misadjusted choke, idle mixture to rich.
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post #5 of 6 Old 08-15-2009, 02:39 PM
djui5
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2004 KJ Liberty 
 
Join Date: May 2008
Location: Arizona, Phoenix area
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Quote:
Originally Posted by Andy5150 View Post
If it runs good cold, and gets bad as it warms, I would think its running rich. Maybe a stuck or misadjusted choke, idle mixture to rich.
What year is it? Do you have that emissions set-up on the exhaust manifolds? What about that flap that opens on the passenger side exhaust where it meets the manifold? There should be some kinda springed device there. Forget what it's called. It's possible that isn't opening like it should.

Randy Wright,
Apache Junction, Arizona

2004 KJ lifted/etc
1974 CJ-6 being restored
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post #6 of 6 Old 08-16-2009, 03:24 PM Thread Starter
jhagerman
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1976 CJ7 
 
Join Date: Jul 2009
Location: Cincinnati
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All ports are capped on the manifolds. It's a 1976 CJ7. I know the passenger side exhaust manifold has been replaced. I think my best bet would be to remove/bypass all un-necessary vacuum/pollution control stuff, as I am finding out a lot has been hacked under the hood.
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