Default Intake Manafold Holes 

Old 10-15-2019, 07:06 PM   #1
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This is my first post. I look forward to learning from all of you!

A quick question. I recently purchased a 86 CJ7. The engine was running rough, is a pain to start (starter fluid gets it going) and you would need to keep a higher rpm otherwise it would putter out.

As i stared cleaning up the engine, it became very clear that there are 3 threaded holes in the intake manifold that were left WIDE open by the previous owner - clearly some sensor was removed, never replaced and is allowing air to flow in downstream of the carb.

Has anyone ever plugged these up? I can literally stick a screwdriver into the manafold. Could this be the cause of my issues?

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Default Re: Intake Manafold Holes 

Old 10-15-2019, 07:49 PM   #2
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Sure could. Can you post pics of the manifold?
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Default Re: Intake Manafold Holes 

Old 10-15-2019, 07:55 PM   #3
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Quote:
Originally Posted by CFCA View Post
I can literally stick a screwdriver into the manafold. Could this be the cause of my issues?

Thanks
Not familiar with a 1987 Jeep but unplugged holes in the intake side of the manifold would definitely be a huge problem. It would make it run much to lean.
Are the holes threaded? If they are get some plugs and plug them up and see if that helps.
Pics would help identify the problem.
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Default Re: Intake Manafold Holes 

Old 10-15-2019, 09:07 PM   #4
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Could this be a model that used a water jacket to heat the underside of the carb? Maybe they are just holes for water hoses.
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Default Re: Intake Manafold Holes 

Old 10-16-2019, 07:30 AM   #5
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Here you go!
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Default Re: Intake Manafold Holes 

Old 10-16-2019, 11:31 AM   #6
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Put your thumb over the holes while running or cranking. If there is vacuum, plug them. I'd probably plug them anyway just for looks/peace of mind.
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Default Re: Intake Manafold Holes 

Old 10-16-2019, 11:45 AM   #7
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Here is what it should look like:

https://www.ebay.com/i/372744505313?...iABEgIVy_D_BwE
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Default Re: Intake Manafold Holes 

Old 10-16-2019, 01:48 PM   #8
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Quote:
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That's a good pic. Everyone who responded to this thread has an earlier version of that manifold with less junk. 😂
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Default Re: Intake Manafold Holes 

Old 10-16-2019, 01:55 PM   #9
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Here's a pic of the sensor holes.Don't understand why you don't have coolant flowing out as two of the sensor holes have coolant flowing through them. The knock sensor is dry and not needed if you aren't using the computer.The only switch you should run is the manifold heater sensor. It turns the manifold heater on/off when the engine is cold. Manifold heater is on the bottom of the intake under the carb. Warms the fuel/air as it flows past.

I used the coolant temp switch for a manual temp gauge.

The hole on the top of the intake that is circled is the input side of the coolant, coming from the water pump, there is a similar hole on the rear of the intake that is where the coolant exits the intake and goes to the heater core. The coolant then comes out the heater core and runs back to the water pump.
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Last edited by yellow85cj; 10-16-2019 at 02:02 PM..

 

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Default Re: Intake Manafold Holes 

Old 10-16-2019, 02:03 PM   #10
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This is the old style manifold. You don't have any coolant leaks? Sorry I see Yellow 85 beat me to it
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