4.7 Question

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harrydunn

harrydunn

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Long-term 80 guy here considering either a 2003+ 100 or a first gen Sequoia. I'm aware of the few issues with the 4.7, mainly exhaust manifold cracks and starter issues. Is there a certain year where Mr. T corrected these problems across all 4.7 platforms?

Thanks.
 
harrydunn said:
Long-term 80 guy here considering either a 2003+ 100 or a first gen Sequoia. I'm aware of the few issues with the 4.7, mainly exhaust manifold cracks and starter issues. Is there a certain year where Mr. T corrected these problems across all 4.7 platforms?

Thanks.
Click to expand...

Manifold crack (usually passenger side) is not all that common, but does happen. If the vehicle you choose to look at does not have a 'ticking' sound right in that area...then you are probably fine.

As for the starter, they are not generally an issue (with respect to quality or longevity), but they ARE in a really inconvenient spot to replace (under the intake manifold).
 
Sounds good. Thanks for the reply.
 
I dont think the cracked manifold is that common after owning 5 Land cruiser/LX470 (1999 - 2006) I have never had one with a manifold crack.

Typically a Toyota 100 series starter will go an easy 150K I have only had one go bad over the years. Replacing is not a big deal you just need to remove stuff to get to it. They normally give you warning signs before giving you time to figure out how to deal with it. Nothing that would keep me from buying a 100 series.
 
Yah, not too worried about replacing the starter, if needed. Exh. Manifolds sound pricey to fix.
 
The 4.7L is a great engine with a long history of reliability.... very few shortcomings whatsoever as mentioned above.... the possible manifold crack and possible starter issue

As for your choice of vehicle.... go 100 series over the Sequoia any day... better longevity, better looking, and better made...... not to much better retained value.



I have a 2006 100 series that I daily drive in all conditions... 180,000 miles on all original everything on the drivetrain/electrics... only change the fluids everywhere one time at 130,000 miles and timing belt was done at 85,000... going to do another timing belt soon...

I was under it lubing the u joints and slip joints the other day and remarking how dry and clean and rust free everything is... such a great vehicle that you can really be proud of.

I think the only thing you will see as a minor shortcoming of a 100 series vs. the 80 series is the lack of solid front axle. In all honesty, unless you are wheeling it all the time on roughtrails, you will never miss it. If you can afford to step to the 2006-2007 100 series, it will gain you a 275hp engine instead of a 230hp....

I am currently getting 17 mpg on the highway with 33’s and a 2.5ome lift kit. All stock except for a K&N air filter. I plan on keeping this one for another 180,000+ miles or more.
 
The extra HP in the 2006-2007 is nice. I tend to feel it more at highway speeds. A known issue with the these years is the air induction "smog pump". It's costly to fix, but luckily there is a bypass. Shouldn't be a problem unless you live in a strict state like California.

Mine just went out, but luckily it was covered by the dealer.

IMG_6441.webp
 
Think the cracked manifolds affected 2000 models more. I had both cracked and put dt headers on, went from a ticking lemon to a roaring manbearpig.
 
Stuckinthemud said:
OK, at risk of looking like a complete idjit, can you please tell me what accounts for the HP difference between to 2006-07 models and prior ones?
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VVTI, (Variable valve timing) vs no VVTI in pre 06. Some argue that the non VVTI are actually a tiny bit more reliable, but that could be jealousy/bias, or a fact based on fewer things to go wrong...
 
Stuckinthemud said:
OK, at risk of looking like a complete idjit, can you please tell me what accounts for the HP difference between to 2006-07 models and prior ones?
Click to expand...


Yes, I have read that the VVTI cams are larger in duration and lift, but since they can be advanced and retarded by the ecm, they are capable of more torque and more horsepower because they can be controlled for optimization.
 
FJ62INTX said:
Yes, I have read that the VVTI cams are larger in duration and lift, but since they can be advanced and retarded by the ecm, they are capable of more torque and more horsepower because they can be controlled for optimization.
Click to expand...
According to specifications I’ve seen, VVTI engines have more horsepower, but same torque.
 
FJ62INTX said:
Yes, I have read that the VVTI cams are larger in duration and lift, but since they can be advanced and retarded by the ecm, they are capable of more torque and more horsepower because they can be controlled for optimization.
Click to expand...
According to specifications I’ve seen, VVTI engines have more horsepower, but same torque.
 
FJ62INTX said:
Yes, I have read that the VVTI cams are larger in duration and lift, but since they can be advanced and retarded by the ecm, they are capable of more torque and more horsepower because they can be controlled for optimization.
Click to expand...
According to specifications I’ve seen, VVTI engines have more horsepower, but same torque.
 
tj714 said:
The extra HP in the 2006-2007 is nice. I tend to feel it more at highway speeds. A known issue with the these years is the air induction "smog pump". It's costly to fix, but luckily there is a bypass. Shouldn't be a problem unless you live in a strict state like California.

Mine just went out, but luckily it was covered by the dealer.

View attachment 1574498
Click to expand...
Extended warranty?
 
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