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My Jeep GC 4.7L......RIP #4594131
12/04/17 03:26 PM
12/04/17 03:26 PM
Joined: Feb 2016
Posts: 169
NY
fcjeep Online content OP
fcjeep  Online Content OP
Joined: Feb 2016
Posts: 169
NY
Sadly,last Tuesday,my beloved Jeep suddenly and without warning dropped a valve seat (maybe several) and bit the dust. Engine is toast....just like that!

I ran a bunch of errands that day and made several stops. Truck ran as smooth as it always had for years. On a restart, out of the blue, it ran very rough and would barely idle. The CEL began flashing so I shut it down. My scanner showed a code of "P0300-random misfire". I thought it was a computer or sensor or ignition issue. Had it towed to a trusted mechanic who gave me the bad news the next morning. A video from the borescope proved him right.

I know the valve seats on these motors can drop if overheated but the truck NEVER EVER came close to overheating in its entire life and I'm the original owner. What a major disappointment from my truck that I maintained so well and was sooo reliable for 153,000 miles.

Still can't believe this happened. I thought for sure it would have made it to 200,000 miles and beyond. SMH.


2006 Jeep GC 4.7L, Died @ 153059 mi frown
2008 Xterra 4.0L, 104500 mi
2016 Jeep GC 3.6L, 19100 mi
2017 Benz C300 14000 mi
Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594134
12/04/17 03:31 PM
12/04/17 03:31 PM
Joined: Sep 2013
Posts: 10,679
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,679
Indiana
I passed on a clean 4.7 Grand Cherokee last spring just because of the valve seats. And I know I would probably speed and get many tickets, but that's another story.

They seem to just die for whatever reason. Very sad though.. especially seeing that you're the original owner.

RIP.

Are you just scrapping it?

Last edited by dlundblad; 12/04/17 03:33 PM.

03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594135
12/04/17 03:32 PM
12/04/17 03:32 PM
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
jeepman3071 Online content
jeepman3071  Online Content
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
Manufacturing and materials failures are the worst, because they usually happen with no warning, and regardless of how the vehicle was maintained.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594137
12/04/17 03:34 PM
12/04/17 03:34 PM
Joined: Nov 2008
Posts: 3,277
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,277
Oshawa, Ontario Canada
A coworker of mine had the same thing happen to his charger. Got the motor rebuilt. He said the new seats are pinned In place.

Wonder if the newer V8s from Jeep/Chrysler have this desin flaw fixed.


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter
Re: My Jeep GC 4.7L......RIP [Re: JC1] #4594159
12/04/17 03:51 PM
12/04/17 03:51 PM
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
jeepman3071 Online content
jeepman3071  Online Content
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
Originally Posted By: JC1
A coworker of mine had the same thing happen to his charger. Got the motor rebuilt. He said the new seats are pinned In place.

Wonder if the newer V8s from Jeep/Chrysler have this desin flaw fixed.


The problem happens in the 4.7L and early 5.7L V8s. I believed the issue was fixed with the later 5.7L's in about 2008 or so.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: My Jeep GC 4.7L......RIP [Re: dlundblad] #4594163
12/04/17 03:54 PM
12/04/17 03:54 PM
Joined: Feb 2016
Posts: 169
NY
fcjeep Online content OP
fcjeep  Online Content OP
Joined: Feb 2016
Posts: 169
NY
Not sure what I'm doing with it yet.

This came at a bad time. I've been in the middle of a personal family issue for several months and don't have a clear mind to figure what to do right now. A remanned Jasper motor is $5900 pl tax.

Last edited by fcjeep; 12/04/17 03:55 PM.

2006 Jeep GC 4.7L, Died @ 153059 mi frown
2008 Xterra 4.0L, 104500 mi
2016 Jeep GC 3.6L, 19100 mi
2017 Benz C300 14000 mi
Re: My Jeep GC 4.7L......RIP [Re: jeepman3071] #4594167
12/04/17 03:56 PM
12/04/17 03:56 PM
Joined: Feb 2016
Posts: 169
NY
fcjeep Online content OP
fcjeep  Online Content OP
Joined: Feb 2016
Posts: 169
NY
You're right. It also happens with the 3.7L as that's the 4.7L with 2 less cylinders.


2006 Jeep GC 4.7L, Died @ 153059 mi frown
2008 Xterra 4.0L, 104500 mi
2016 Jeep GC 3.6L, 19100 mi
2017 Benz C300 14000 mi
Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594169
12/04/17 03:57 PM
12/04/17 03:57 PM
Joined: Sep 2013
Posts: 10,679
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,679
Indiana
Originally Posted By: fcjeep
Not sure what I'm doing with it yet.

This came at a bad time. I've been in the middle of a personal family issue for several months and don't have a clear mind to figure what to do right now. A remanned Jasper motor is $5900 pl tax.


No way. Get a low mileage salvage yard engine.

I don't go to a mechanic for much, but the one I do trust installed an 80k 4.0 in a 1999 Cherokee for $1800 plus tax out the door. He uses a huge salvage yard in Chicago/ Michigan City area.. Just to give you an idea.


03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594176
12/04/17 04:05 PM
12/04/17 04:05 PM
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
jeepman3071 Online content
jeepman3071  Online Content
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
It all depends if Jasper fixes the problem. You don't want to go through this to possibly have it happen again (if you plan on keeping the Jeep). From what I've heard about Jasper on here they don't inspire much confidence.

Not sure why, but that seems high for a rebuilt 4.7L. Maybe it has just been a while since I priced one out. I second the idea of finding a verified low mileage salvage engine. Sometimes you can find one from a crashed vehicle that you can still hear run and see the odometer. The 4.7 was used in a variety of Jeep and Dodge vehicles.

It's a shame this happened, because otherwise the 4.7L is a pretty nice engine. Good acceleration for it's size and not bad on fuel. My dad had one in his 1999 Grand Cherokee that he sold with 180k.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594177
12/04/17 04:05 PM
12/04/17 04:05 PM
Joined: Jun 2017
Posts: 615
DFW
JustN89 Offline
JustN89  Offline
Joined: Jun 2017
Posts: 615
DFW
Originally Posted By: fcjeep
Not sure what I'm doing with it yet.

This came at a bad time. I've been in the middle of a personal family issue for several months and don't have a clear mind to figure what to do right now. A remanned Jasper motor is $5900 pl tax.

JASPER = NEVER AGAIN

Re: My Jeep GC 4.7L......RIP [Re: jeepman3071] #4594194
12/04/17 04:34 PM
12/04/17 04:34 PM
Joined: Sep 2013
Posts: 10,679
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,679
Indiana
Originally Posted By: jeepman3071
It all depends if Jasper fixes the problem. You don't want to go through this to possibly have it happen again (if you plan on keeping the Jeep). From what I've heard about Jasper on here they don't inspire much confidence.

Not sure why, but that seems high for a rebuilt 4.7L. Maybe it has just been a while since I priced one out. I second the idea of finding a verified low mileage salvage engine. Sometimes you can find one from a crashed vehicle that you can still hear run and see the odometer. The 4.7 was used in a variety of Jeep and Dodge vehicles.

It's a shame this happened, because otherwise the 4.7L is a pretty nice engine. Good acceleration for it's size and not bad on fuel. My dad had one in his 1999 Grand Cherokee that he sold with 180k.


Jasper: Never again!!!


03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: My Jeep GC 4.7L......RIP [Re: dlundblad] #4594195
12/04/17 04:37 PM
12/04/17 04:37 PM
Joined: Feb 2016
Posts: 169
NY
fcjeep Online content OP
fcjeep  Online Content OP
Joined: Feb 2016
Posts: 169
NY
I don't want to get a salvage yard 4.7 because it will still have the same design flaw and this could happen again. Thought about doing the heads but the cylinder wall appears damaged and I don't even know about a few other cylinders. Could be a lot of labor for nothing.

And I've read a lot of mixed reviews about Jasper but my mechanic likes 'em.


2006 Jeep GC 4.7L, Died @ 153059 mi frown
2008 Xterra 4.0L, 104500 mi
2016 Jeep GC 3.6L, 19100 mi
2017 Benz C300 14000 mi
Re: My Jeep GC 4.7L......RIP [Re: jeepman3071] #4594196
12/04/17 04:40 PM
12/04/17 04:40 PM
Joined: Feb 2016
Posts: 169
NY
fcjeep Online content OP
fcjeep  Online Content OP
Joined: Feb 2016
Posts: 169
NY
My understanding is that Jasper fixed the problem. If the fix works I don't know.

The price includes the installation and a new intake manifold and an install kit which I haven't been able to find out exactly what that is yet.


2006 Jeep GC 4.7L, Died @ 153059 mi frown
2008 Xterra 4.0L, 104500 mi
2016 Jeep GC 3.6L, 19100 mi
2017 Benz C300 14000 mi
Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594206
12/04/17 05:02 PM
12/04/17 05:02 PM
Joined: Jun 2003
Posts: 17,814
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,814
Deplorable in apple valley, ca
Another thing worth mentioning. When this happens hot pieces of seat get blown into the plastic intake manifold where they cool and melt into the manifold. Eventually they work out and get sucked into a cylinder and it blows up again. You must replace the intake manifold along with the new engine or it will happen again.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: My Jeep GC 4.7L......RIP [Re: fcjeep] #4594211
12/04/17 05:12 PM
12/04/17 05:12 PM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
Let us know what you end up doing.

Something as basic in design as a valve seat should not be a problem either in design or manufacturing and assembly. smile

Would the problem have been solved in a later model vehicle making a junkyard engine a reasonable solution?

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