2008 Jeep Liberty Q&A

2008 Jeep Liberty Question: cylinder #3 no compression

after starting vehicle it idled very rough and then stalled. Restarted and found it to be skipping and knocking. Brought it into the garage and pulled spark plugs. Did a compression test and found that #3 cylinder has zero compression. The mechanic has a feeling that it may be the valve seat or the valve face has broken off. please respond with any info that will be helpful. Also wondering if there may be a recall on the valve train? -
Answer 1
More than likely it has dropped the exhaust valve seat out of the head and is holding the valve open.... Pretty common on the 3.7 & 4.7 engines!... No recall that I am aware of.....Has the engine ever overheated?? -