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Can't find intake manifold leak.

hazardsys

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June 5, 2013
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City, State
Dothan, AL
Year, Model & Trim Level
2001 explorer sport
I believe my 2001 ex sport has a leak in the intake manifold gasket, but I haven't been able to find it. I went all around it with carb cleaner trying to change in revs with no luck. Heres the symptoms, the usual 0171 and 0174 codes and when i rev it at the throttle body i can hear a sucking noise. It sounds similar to a secondary on a 4bbl carb kicking in and suckig in air. This is with air intake and all that attached. I also noticed the elbow attached to the valve right behind the throttle body on passenger side keeps collapsing at idle. When i rev it opens up some. Is there any one place that the gasket is prone to fail? Might help me to find the leak if I have a better idea where to look. Thanks.
 



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swshawaii

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hazardsys

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2001 explorer sport
Thanks. I'll check the PCV elbow later today. If it is the intake gaskets how long could i go with it leaking? I'd like to avoid putting too much money into this engine. The previous owner didnt take care of it very well and I know its probably a matter of time before major stuff like chain guides etc start going out. My plan is to do a 5.0 swap eventually.
 






Flash

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1997 Limited
I'm not sure why you need to find out where the gasket is leaking, if it's leaking it will need replacing everywhere.
 






Erik727

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spring,TX
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1999 Explorer eddie Bauer
What Flash said.....I understand not wanting to put alot of cash into it...but you can get a set of lower and upper manifold gaskets as a kit for under $20..

97-01 4.0 SOHC Fel-pro # MS90890 $16.99 upper and lower
 






bwheeler73

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Phoenix
Year, Model & Trim Level
2000 explorer
Battery acid on purge valve under battery tray seen it a few times
 






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