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Old 03-13-2014, 05:40   #1 (permalink)
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2003 4.6 intake manifold gasket

Im replacing the intake manifold gaskets, there was a leak. Uts a 2003 Grand Marquis 165000 miles. Runs great besides the miss from said leak. Upon removing the intake I noticed cracks throughout a thin pladtic type plenum. My question is do I need to replace this, do I need it? I'm sure it's because the only way to obtain it is by a head gasket set . Didn't come with the intake gasket kit. I don't remember my 98crown vic having this when I changed the intake

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Old 03-13-2014, 17:49   #2 (permalink)
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Re: 2003 4.6 intake manifold gasket

Could you post a picture? Having a hard time picturing what you are talking about.


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Old 03-13-2014, 18:12   #3 (permalink)
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Old 03-13-2014, 18:35   #4 (permalink)
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Re: 2003 4.6 intake manifold gasket

I don't remember this being on my crown vic's manifold when I had to remove the intake

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Old 03-13-2014, 18:37   #5 (permalink)
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Re: 2003 4.6 intake manifold gasket

I believe that to be an insulation blanket. Don't think I would worry about it.


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Old 04-30-2015, 07:50   #6 (permalink)
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Re: 2003 4.6 intake manifold gasket

My Dad's 99 Merc Marquis has a small anti freeze leak (front corner) Is that what your was leaking? It does seem to have a mis fire also?
Did you change just the gasket or did you replace the plastic manifold also.
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Old 04-30-2015, 17:54   #7 (permalink)
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Re: 2003 4.6 intake manifold gasket

I answered you before., but I didn't see anything about a misfire. Either the manifold or the gasket is leaking. You can get it pressure tested to see if you can see where it's coming from. Another way is to wipe it down as best you can, then give it a light dusting of talc and see if you can pick up where the leak is originating.
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Old 05-31-2015, 09:14   #8 (permalink)
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Re: 2003 4.6 intake manifold gasket

ok thx. We found a crack in the manifold by the front pass. side bolt.
Replacing the manifold and gasket fixed the leak, but it still stumbles under a load, idles fine.
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Old 05-31-2015, 18:31   #9 (permalink)
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Re: 2003 4.6 intake manifold gasket

Hows the plugs look? Leaky manifolds will frequently foul plugs.
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