Hemi won't start, dropped valve? Blown engine? - Jeep Commander Forums: Jeep Commander Forum
Problems / Dealer Service Having a problem with your vehicle? Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

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post #1 of 23 (permalink) Old 09-13-2016, 12:28 PM Thread Starter
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Join Date: Sep 2013
Location: Shreveport, LA
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Model year: 2006
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Exclamation Hemi won't start, dropped valve? Blown engine?

Hey guys,

I've read these types of posts before, and hoped I'd never be the guy on this end of it.

My 2006 XK Hemi 4x4 has 116k miles. I religiously change the oil, and changed the plugs July last year.

I got in my Jeep on Thursday, and drove 10 mins up the road to pick up my son from school. No issues. I parked, went inside, and came out 5 mins later, and the Jeep wouldn't start. Turns over fine, tach shows rpms while cranking, but no idle. If I pumped the throttle, I got maybe 2-3k rpms before it died again. I checked every fuse, then called a tow.

Yesterday, the shop (independent) called and said they think "there's something loose inside the engine", and they I'll have to replace it. Quoted me $3700 for the engine, $2000 labor, $500 misc parts, and $590 tax for a grand total of $6890. OUCH!

The mechanic said he DID NOT pull the heads and scope the cylinders. He said it would just be a waste of time and money on my part. What do you guys think of this?

After reading up on it, I'm guessing the valve dropped into the cylinder. Seems like a common source of catastrophic engine failure for the Hemi. What do you guys think?

Either way, I will be getting a second opinion. The mechanic said he won't charge me to store the Jeep for a week or so while I figure out what to do. Luckily, I have a car I can borrow.

It's hard to justify spending $7k on a maybe $10k Jeep, no matter how much I love it.

Mine: '06 XK Limited Hemi, QD II
Hers: '13 Chevrolet Suburban LTZ
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post #2 of 23 (permalink) Old 09-13-2016, 04:21 PM
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Join Date: Oct 2015
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I think you made a big mistake going to that independent shop.

I'd take it to a reputable Chrysler/Jeep dealership for a 2nd opinion before you do anything else.


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Last edited by Big Blue; 09-14-2016 at 02:10 PM.
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post #3 of 23 (permalink) Old 09-13-2016, 09:26 PM
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Join Date: May 2006
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Is this local shop one you have used in the past and trust or is it a new shop? I don't have much to say about dealers since they told me my 06 was a classic and they had to search fora front differential in junk yards not their term, it it was definitely not not a new part, and that was after they claimed they replaced it once before and I can tell you it was not replaced. You are on the right track with a second opinion.
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post #4 of 23 (permalink) Old 09-13-2016, 10:24 PM
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Buy a cheap USB borescope on amazon. Pull the plugs and check for yourself takes maybe 30 minutes. I wouldn't take anything to a shop that says "something's loose in the engine" and then tells its a waste of time and money for them to actually look.

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post #5 of 23 (permalink) Old 09-14-2016, 02:07 PM
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Quote:
Originally Posted by T1RKaZz View Post
I wouldn't take anything to a shop that says "something's loose in the engine" and then tells its a waste of time and money for them to actually look.
That's exactly what I was thinking when I read it, that's why I suggested getting a second opinion from a Jeep dealership.

Like Creek said, not all dealership's have their crap together either, but, there are some good ones around.

Just do your homework and read some reviews prior to picking one.


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Last edited by Big Blue; 09-14-2016 at 02:09 PM.
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post #6 of 23 (permalink) Old 09-18-2016, 08:42 AM
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Sorry to hear about your commander, I just had same exact problem happen several months ago, to my 06 hemi, quick stop, sounded like something was banging around inside motor. Second opinion is never a bad idea, but chances are it's a dropped seat valve, and all the scoping in the world won't help the situation, as it cheaper and easier to just put a new/used/reman longblock in it.
From experience, you will pay just as much for a junk yard pull which will ultimately drop another seat at some point, there are shops that sell reman longblocks (work of art when done right) with tighter tolerances to prevent valve seat issue from happening again.
I paid $2750 for a new longblock with tighter tolerances on the valve seats (3 year/ unlimited mile warranty) and my 06 hemi hasn't run this good since I orignally purchased it. No more hemi tick either.
Like mentioned above, do some research first on shops that know the 5.7l and know about the valve seat problems. It will save a lot of headaches in the long run.
Again sorry to hear about you XK
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post #7 of 23 (permalink) Old 09-19-2016, 11:35 PM
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Out of curiosity house fly, what mileage were you at when this happened?
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post #8 of 23 (permalink) Old 09-20-2016, 09:20 AM Thread Starter
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Join Date: Sep 2013
Location: Shreveport, LA
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Model year: 2006
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So I took it to a different independent shop. They said they think it jumped timing. Quoted me $8400 for a Jasper engine. Not going to do it. Opinions anyone?

Mine: '06 XK Limited Hemi, QD II
Hers: '13 Chevrolet Suburban LTZ
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post #9 of 23 (permalink) Old 09-20-2016, 09:22 PM
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Honestly, it depends how far you are willing to go, and by go I mean spend. Your best/safest bet is going to be a reman or a used engine. With a used engine you can plan on it happening again. From what I have figured the issue is with the valve seats not being large enough and the aluminum head expanding faster than the steel valve seat. It is also caused by over heating.

I dropped a valve seat back in March. I wasn't willing to drop 4 to 6 grand in the truck, when the it may barely pull that on the trade in. I bought some reman heads with the larger valve seats to help avoid it dropping a seat again. I only damaged one piston so I bought a piston from the dealer. I popped the heads off, dropped the oil pan, threw the new piston in, and threw the heads on. I ended up spending about $1200.00 or $1400.00.

This is an extremely simplified version of what actually happened. With the amount of work that went into it, I guess I could have swapped out the engine a couple of times. I do not recommend trying this method as it may not work for you. I read a lot of horror stories of dropped valve seats. There is pretty large thread over on lx forums about the issue.


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Last edited by T1RKaZz; 09-20-2016 at 09:24 PM.
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post #10 of 23 (permalink) Old 09-20-2016, 09:27 PM
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Here's some carnage.







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