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2010 5.4 hard to find exhaust leak

Old 10-22-2018, 11:45 PM
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Default 2010 5.4 hard to find exhaust leak

I have an obvious exhaust leak sound on the left side that just started at 180,000 , does the Pfffft type tick under hard acceleration, from standing or on the road climbing a hill with the trailer,(ETC) , (Sure does not sound to me like a cam Phazer tick which is more metallic)
I climbed under with it running cold and felt around and cant find anything ,
Cant see any broken studs but the leak is not easy to hear at idle or in neutral rev. ,
cannot see any holes between manifold and cats
Checked all the spark plugs and none were loose
seems to definitely be coming from the left side
has anyone had a similar situation and solved it ?
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Old 10-23-2018, 01:39 PM
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When the engine is cold, stuff a rag in the exhaust pipe and start the engine. Crawl underneath and see if you can hear where the exhaust is leaking or where it is loudest. Exhaust manifolds are not uncommon and unfortunately are not fun to replace. See if there is a lot of soot anywhere, usually a sign of a leaking exhaust.
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Old 10-23-2018, 02:27 PM
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I second a warped/cracked exhaust manifold. On the 5.4, the pass side is usually the problem child, but either side wouldn't surprise me. If you need a new manifold, spend the money for a genuine Ford part. Dorman replacement manifolds have a rather poor track record. I think the Ford part comes with studs and a gasket.
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