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post #1 of (permalink) Old 03-26-2001, 07:00 PM Thread Starter
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Intake manifold supposed to have holes in it?

Hey Guys

I've been asking more questions than I know what to do with...and its all the fault of my Mag-lite which has allowed me to peer into the depths of....nevermind.

I was putting my carb back on the '79 CJ5 304 and decided to look down the intake manifold. At the bottom, there were two holes about 1/2 inch or so across through the plenum(sp). Are these supposed to be here? They have oil under them...is that normal? What are they for?

If any of you guys know what this is, let me know..it doesn't seem right to let gas laden air into the oil and viceversa!

Fritz


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post #2 of (permalink) Old 03-26-2001, 08:06 PM
 
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Re: Intake manifold supposed to have holes in it?

there shouldn't be oil under them the intake gasket is actually a tin shield (major pain in the ass to replace )but it blocks the intake from the lifter valley

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post #3 of (permalink) Old 03-26-2001, 09:14 PM
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Re: Intake manifold supposed to have holes in it?

I think that is the return for the EGR system.

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post #4 of (permalink) Old 03-27-2001, 08:57 AM
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Re: Intake manifold supposed to have holes in it?

[img]/wwwthreads_images/icons/smile.gif[/img] I'm with WILL on this one......what you are looking at are the inlets from the Exhaust GAs Recirculator System. That liquid is gas from playin' with the carb too much.[img]/wwwthreads_images/icons/crazy.gif[/img]

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post #5 of (permalink) Old 03-27-2001, 09:11 AM Thread Starter
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Re: Intake manifold supposed to have holes in it?

Would it still have gas after sitting for three months without a carb on it? I had a cardboard cover on it, but it wasn't tight and of couse the hood was shut. Would Gas stay that long? I'll pull the carb back off and pull some of it out to see. The EGR sounds good though. Does this limit performance any? Also, can a non-EGR intake be put in this one's place?

Fritz

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post #6 of (permalink) Old 03-27-2001, 09:25 AM
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Re: Intake manifold supposed to have holes in it?

[img]/wwwthreads_images/icons/smile.gif[/img] Yep.....a sample would be a big help. And yes....you can put a non-EGR intake on that 304. We had a nice Edelbrock intake and had to take it off to meet CA Smog. We traded the intake for a stocker with a 2100. The 2100 has the altitude commpensator and before we sold our mountain nest to some yuppies, we were climbing 2500 feet in just nine miles to get home each day. EGR doesn't really limit performance till it actually opens up. When we set ours up, we used the smallest orifice we could find in the EGR valve.[img]/wwwthreads_images/icons/crazy.gif[/img]

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post #7 of (permalink) Old 03-29-2001, 07:14 PM Thread Starter
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Re: Intake manifold supposed to have holes in it?

My congrats go out to CJDave! After a quick check using the utmost in high quality research eguipment...a straw...I have found that the residue at the bottom is in fact VERY old grimy gas. I'm not sure if the lack of a functioning EGR valve would have caused this, but it seems to be on only one side of the manifold. I buttoned everything back up and promptly discovered a dead battery, so its not going to be anytime soon when I get to hear my 304 run again.

Thanks to all!

Fritz

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