[brodphish]

I have a 2007 king cab 4x4 and love the truck. Right now it's got 100,XXX miles in it with many of them being recent (it was a very low mile truck until 2014). In general the truck has been very well maintained with most of the work done by dealers. I would expect few service issues with it going forward with one BIG exception:

In late 2015 round 75,000 miles the dealer service writer told me the exhaust manifolds were cracked (the truck was at the dealer for quite bit of other work - read big bill). He also said there would be no driveability issues. In late 2016 with about 95,000 on the clock it was in for more work (big bill again). The same service writer told me the same thing - no driveability issues associated with it. Only I had just read in these forums the cracked manifolds lead to excessive engine wear and lost power. Agree or not? The truck will still easily put down rubber.

About this time the truck was returning to low-mileage duty. So not urgent I get it fixed - if any damage was going to occur the vast majority was done.

1. Is there concensus about engine wear or just one member's opinion?
2.Given 25k of usage with cracked manifolds should I assume excessive engine wear?

I am trying to weigh replacing it or driving it until the wheels fall off. Strictly boat pulling and errand running duty at this time and going forward. IF I decide to replace, what year were the manifold issues fixed, 2012?

Thanks for your help

 

[FishnAlaska]

The manifold issues were never really fixed, they added some additional support to the crack prone areas, but they still crack. Cracked manifolds lead to running rich, more fuel dumped into the system, leads to burnt valves, and potentially burnt out cats, which end up failing and potentially having burn out media from the cats being sucked back into the engine, and causing scarring on the cylinder walls. The best and least expensive (still about $1600-1800 plus install) is JBA headers/Uprev via cajunbpipes.com stage one performance package.

 

[brodphish]

Any guidance on how much damage may be already done given the mileage after knowing they were cracked? I'd really like to keep the truck but don't want to put money in it if likely there will be long-term problems related to the cracked manifolds.

Fishnalaska I love the name. I only moved to Green BAy but we do have world class musky, walleye amd smallmouth right off the dock. Big trout and salmon are short drive away (lake Michigan)

 

[FishnAlaska]

Hard to say how much, or if any damage has been done unless you tear it apart, depends on how hard you push the truck (IE drive it like you stole it). Some guys have gone years and thousands of miles without any damage.

I lived up in AK for 10 years, the fishing is out of this world, wish I could live up the for 3 months every year for salmon season.

 

[Blevinger]

If you like the truck, run the JBA/Cajun system and keep it forever.

You'd have to pull the cats to look at any (if at all) busted media coming out. If you really, really wanted some idea of possible (speculative) issues, you could look there.

 

[Mastermind46]

07 with cracked manifolds as well. Also love fishing. Haven't really enjoyed fishing in CO anywhere near as much as FL but it's still decent.

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[LUBECAKES]

You can't go wrong with the Cajun exhaust and tune package, unless your state does the tailpipe sniffer and/or a visual inspection of the exhaust.
If you haven't had a p0420 or p0430 code yet I'd say your cats are still there and working. If you have a cracked manifold that side of the engine will run rich and plug the cat over time. The crack allows air to be pulled in and read by the oxygen sensor, telling the Ecu to add fuel. Once it starts getting plugged up the cat will begin to fall apart. The valve overlap in the VK 56 is enough to actually suck particles into the cylinders. This can cause scarring of the cylinder walls as well as valve and seat damage. It would be a shame to let that happen.

The question is whether you think the truck is worth it or not.

 

[Mastermind46]

I do not recall them doing a visual inspection in co but some have said otherwise. Cajun says the cats will pass a sniffer test though. I'm getting ready to find out...

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[thumperpaul]

You can't go wrong with the Cajun exhaust and tune package, unless your state does the tailpipe sniffer and/or a visual inspection of the exhaust.
If you haven't had a p0420 or p0430 code yet I'd say your cats are still there and working. If you have a cracked manifold that side of the engine will run rich and plug the cat over time. The crack allows air to be pulled in and read by the oxygen sensor, telling the Ecu to add fuel. Once it starts getting plugged up the cat will begin to fall apart. The valve overlap in the VK 56 is enough to actually suck particles into the cylinders. This can cause scarring of the cylinder walls as well as valve and seat damage. It would be a shame to let that happen.

The question is whether you think the truck is worth it or not.

If the cats are slowly getting plugged, wouldn't that in itself throw a code? My buddy's 2006 Armada has had cracked manifolds for years, with no codes that I can detect.

 

[LUBECAKES]

Plugged cats typically do not set codes, but anything is possible. It's when they break up that you get codes.