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#4594131 - 12/04/17 03:26 PM My Jeep GC 4.7L......RIP
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: 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
2008 Xterra 4.0L, 99000 mi
2016 Jeep GC 3.6L, 12600 mi
2010 Fusion 3.5L, 110300 mi
2017 Benz C300 Sport 8K mi

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#4594134 - 12/04/17 03:31 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
dlundblad Offline


Registered: 09/30/13
Posts: 10048
Loc: 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?


Edited by dlundblad (12/04/17 03:33 PM)
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4594135 - 12/04/17 03:32 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4220
Loc: 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 (180k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4594137 - 12/04/17 03:34 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
JC1 Offline


Registered: 11/29/08
Posts: 3009
Loc: 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/Wix Filter
1997 Honda Civic CX 5w-30 PPPP/Mahle Filter

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#4594159 - 12/04/17 03:51 PM Re: My Jeep GC 4.7L......RIP [Re: JC1]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4220
Loc: 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 (180k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4594163 - 12/04/17 03:54 PM Re: My Jeep GC 4.7L......RIP [Re: dlundblad]
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: 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.


Edited by fcjeep (12/04/17 03:55 PM)
_________________________
2006 Jeep GC 4.7L, Died @ 153059 mi
2008 Xterra 4.0L, 99000 mi
2016 Jeep GC 3.6L, 12600 mi
2010 Fusion 3.5L, 110300 mi
2017 Benz C300 Sport 8K mi

Top
#4594167 - 12/04/17 03:56 PM Re: My Jeep GC 4.7L......RIP [Re: jeepman3071]
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: 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
2008 Xterra 4.0L, 99000 mi
2016 Jeep GC 3.6L, 12600 mi
2010 Fusion 3.5L, 110300 mi
2017 Benz C300 Sport 8K mi

Top
#4594169 - 12/04/17 03:57 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
dlundblad Offline


Registered: 09/30/13
Posts: 10048
Loc: 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 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4594176 - 12/04/17 04:05 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4220
Loc: 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 (180k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4594177 - 12/04/17 04:05 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
JustN89 Offline


Registered: 06/27/17
Posts: 475
Loc: 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

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#4594194 - 12/04/17 04:34 PM Re: My Jeep GC 4.7L......RIP [Re: jeepman3071]
dlundblad Offline


Registered: 09/30/13
Posts: 10048
Loc: 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 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4594195 - 12/04/17 04:37 PM Re: My Jeep GC 4.7L......RIP [Re: dlundblad]
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: 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
2008 Xterra 4.0L, 99000 mi
2016 Jeep GC 3.6L, 12600 mi
2010 Fusion 3.5L, 110300 mi
2017 Benz C300 Sport 8K mi

Top
#4594196 - 12/04/17 04:40 PM Re: My Jeep GC 4.7L......RIP [Re: jeepman3071]
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: 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
2008 Xterra 4.0L, 99000 mi
2016 Jeep GC 3.6L, 12600 mi
2010 Fusion 3.5L, 110300 mi
2017 Benz C300 Sport 8K mi

Top
#4594206 - 12/04/17 05:02 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
Chris142 Offline


Registered: 06/05/03
Posts: 16825
Loc: 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 durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4594211 - 12/04/17 05:12 PM Re: My Jeep GC 4.7L......RIP [Re: fcjeep]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: 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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