AMC 304 Rebuild Intake Manifold White Smoke - JeepForum.com
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post #1 of 35 Old 04-07-2013, 01:13 AM Thread Starter
Greekcj5
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AMC 304 Rebuild Intake Manifold White Smoke

All,

I recently rebuilt my 72 AMC 304, but when I started it back up, even though it started right up, I have quite a bit of white smoke coming out from the rear hole of the Edelbrock intake manifole I have on it. Is this something normal or am I in for a surprise?

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post #2 of 35 Old 04-07-2013, 06:26 AM
OleBlue73
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Quote:
Originally Posted by Greekcj5
All,

I recently rebuilt my 72 AMC 304, but when I started it back up, even though it started right up, I have quite a bit of white smoke coming out from the rear hole of the Edelbrock intake manifole I have on it. Is this something normal or am I in for a surprise?
The hole where either the PCV valve or the EGR valve (if equipped) goes?

1973 CJ5, 304, T15, D20
2009 JKU, Rubicon
2005 TJ, X, 4.0, 6 speed
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post #3 of 35 Old 04-07-2013, 12:05 PM Thread Starter
Greekcj5
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This is the hole. I don't think anything was there when i took it apart.

forumrunner_20130407_110524.jpg
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post #4 of 35 Old 04-07-2013, 12:08 PM Thread Starter
Greekcj5
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Not sure why it looks like something is in the hole but here's another to give a better idea of what I'm talking about.

forumrunner_20130407_110834.jpg
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post #5 of 35 Old 04-07-2013, 12:32 PM
Caish
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Looks like a Crankcase vent of some kind goes there.
http://www.ebay.com/itm/EDELBROCK-RB...p2047675.l2557
Completed auction of an intake.
But you can see on it there is a bung that goes in that hole and a PCV valve goes there, that is normally on a valve cover of other engine makes.

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post #6 of 35 Old 04-07-2013, 01:02 PM Thread Starter
Greekcj5
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Holy cr@p I've had this Jeep for almost 2 years now but the PO never had anything in that hole so i assumed it was supposed to be open. What about the white smoke though? I barely drove it before the engine rebuild because of a pretty bad oil leak from the rear main seal so i don't know if it was smoking before. Isn't white smoke a sign of coolant burning?
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post #7 of 35 Old 04-07-2013, 02:18 PM
jumbojeepman
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That's the hole for the PCV. Probably oil smoke coming out of it, definitely needs a PCV in there.
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post #8 of 35 Old 04-07-2013, 02:50 PM Thread Starter
Greekcj5
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Awesome. I'll find one online and install it then. Thanks gents
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post #9 of 35 Old 04-08-2013, 04:24 PM
Hurricane4
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PVC Grommet J4006019

The unbelievable we can do immediately . . . the impossible just takes a little longer.
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post #10 of 35 Old 04-08-2013, 04:36 PM Thread Starter
Greekcj5
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Thanks orange.
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post #11 of 35 Old 04-08-2013, 05:26 PM
Caish
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When you first start it, if your seeing white smoke, it could just be normal condesation vaporing out of the cold engine and should clear up shortly.
If the oil is not milky and I wasn't loosing coolant not sure I would worry to much about it.

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post #12 of 35 Old 04-08-2013, 05:42 PM Thread Starter
Greekcj5
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I ran it for about 25 minutes and the smoke kept coming. I actually drained the oil after i ran it cause i noticed a small oil leak from a pinched seal and the oil looked good. The engine did take me a few months to put back together and with the winter i could understand the moisture but i never thought it would smoke like that that or smoke that long.
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post #13 of 35 Old 04-08-2013, 05:47 PM
ASteve
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Greek,

I have the same year and engine. Make sure you get the right PCV as they are tuned for the engine they sit on. Also, that rubber grommet is no longer made, but this one fits....http://www.summitracing.com/parts/rnb-42056
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post #14 of 35 Old 04-08-2013, 05:58 PM Thread Starter
Greekcj5
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Thanks Steve. I'll probably order the valve and grommet tonight and try to start it back up this or next weekend and see how it does with the valve. I looked real quick for the valve but all i saw were forum threads about it. Anyone know off the bat who sells it?
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post #15 of 35 Old 04-08-2013, 08:13 PM
tchimmerroks
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Quote:
Originally Posted by Greekcj5 View Post
All,

I recently rebuilt my 72 AMC 304, but when I started it back up, even though it started right up, I have quite a bit of white smoke coming out from the rear hole of the Edelbrock intake manifole I have on it. Is this something normal or am I in for a surprise?
Years ago I owned a '78, 304 equipped CJ5. The fuel/emissions was all stock and I recall the PVC had a vacuum hose that connected to a vacuum source at the carburator. I would double check the vacum diagram for your year Jeep however.
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