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Old 03-21-2006
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MAC Intake help.

I just intsalled it on my truck today and now my idle sucks. The truck shudders and will eventually shut off. I reset the battery to see if that would help and it dosent. Any clue what to do? Also does anyone have pics of the MAC intake in there truck. I wanna make sure everything is plugged in right. Thanks all.
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Old 03-21-2006
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we need some information about your truck. i.e. year, engine size and so on. then ill see if i can give my 2 cents.
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Old 03-21-2006
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Is the PCV pipe installed to the intake? If not, you get a vacuum leak and bad idle.

It's the little pipe in the pic. Goes from valve cover to hole in intake

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Old 03-21-2006
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Quote:
Originally Posted by SilverTank
Is the PCV pipe installed to the intake? If not, you get a vacuum leak and bad idle.
it is the crankcase breather tube, and if it is not connected you will indeed have a vacuum leak and a bad idle. If it is connected and just kinked, you'll have the vacuum problem but not the bad idle.

Last edited by its cheddar baby; 03-21-2006 at 04:18 PM.
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Old 03-21-2006
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Opps thought I had a signature. 3.0 03 Edge. Yeah its installed but now at an angle so I think that might be something to do with it. Thats why I wanted to see some pics as well.
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Old 03-21-2006
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Quote:
Originally Posted by Johns777
Opps thought I had a signature. 3.0 03 Edge. Yeah its installed but now at an angle so I think that might be something to do with it. Thats why I wanted to see some pics as well.
make sure there is no kinks or other forms of obstructions.

if that doesnt help, it wouldnt hurt to take it back off and fully inspect everything on the intake and re-install it.
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Old 03-21-2006
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actually its a crankcase breather tube, if its not connected you will have a vaccuum leak and a bad idle, if its kinked it should not affect the idle
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Old 03-21-2006
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I havent touched it yet but at lunch tonight I let my truck idle for a lil and it ran rough but didnt shut off this time.
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Old 03-22-2006
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I have the filter and the holder, and no problems with mine. Definatly check that small tube.
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Old 03-22-2006
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Quote:
Originally Posted by its cheddar baby
it is the crankcase breather tube, and if it is not connected you will indeed have a vacuum leak and a bad idle. If it is connected and just kinked, you'll have the vacuum problem but not the bad idle.
Technically, Ford calls it the Crankcase ventilation hose. The system is positively charged and has a PCV filter, which is why I refer to it as the PCV hose. When disconnected, you actually lose pressure but the Ford diag manuals call it a vacuum leak, go figure
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Old 03-22-2006
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yea id do what others have suggested, dont know what else it could be, cause its not like your really changed much or messed with too much. yer truck might have just not liked the new airflow too much ..idk :P
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Old 03-22-2006
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Ohh well thx for all the replies. I will keep playing with it until it is happy.
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