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 Post subject: 0 compression in # 3 cylinder. Uh, Oh.
PostPosted: Mon May 12, 2008 7:59 pm 
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My brother's 04 kj 3.7L started missing a little bit on cold starts a couple of months ago but would smooth out after a couple blocks of driving. It would throw a CEL and the scanner would just say misfire in #3 cylinder. last week he was driving and the engine made a terrible clanging sound and lots of smoke. He was able to limp home but just barely. He checked the compression and # 3 has zero compression. has anyone on the forum ever thrown a valve in their 3.7L?

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 Post subject:
PostPosted: Mon May 12, 2008 8:08 pm 
I've heard of a few 3.7s and 4.7s doing it. How many miles are on it?


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PostPosted: Mon May 12, 2008 8:24 pm 
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I had a broken valve spring on my 3.7 somewhere between 100,000 and 110,000 miles. Had all the valves and springs replaced then. Wasn't cheap but now I have 160,000 and running strong.


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PostPosted: Mon May 12, 2008 9:09 pm 
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ThunderbirdJunkie wrote:
I've heard of a few 3.7s and 4.7s doing it. How many miles are on it?


63K, can you believe that. Do these engines break the valve if this happens or just bend them?

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PostPosted: Mon May 12, 2008 9:52 pm 
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From what Ive heard the valve doesnt hit the piston but Im not saying it didnt happen on his engine.

04 kj will have a 7yr/70 powertrain warranty unless it was bought used and not transfered over. 60k is pretty sad. :?

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PostPosted: Mon May 12, 2008 10:12 pm 
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Yep he bought it used.

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 Post subject:
PostPosted: Mon May 12, 2008 11:42 pm 
nurse...i'd agree about the broken valve spring.

If he's able to check his own compression, he should be able to change his own valve springs...parts are cheap, labor isn't!


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PostPosted: Tue May 13, 2008 8:26 pm 
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Wow, changing valve springs, what loads of fun :roll: :lol: .

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PostPosted: Wed May 14, 2008 8:43 pm 
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106k on my 02' still runs real strong. I hope my springs don't break any time soon. Not looking forward to that!

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