They've had a lot of issues with the new 3.4L TT in the Tundra and Sequioa. Most have been resolved though, but any design with an electronic actuator operating the turbo waste gate is destined to be problematic. There's just too much heat right there for electronics to manage that.

The 5.7L V8 had some teething issues when it first came out too - as did the V6 engine in the 1990s 4Runner when first offered.

Toyota is not without issues, but they work pretty hard to correct them as quickly as possible. Most of their dealers are easy to work with too.

Their problem is that the 4.0L in the 2023 4Runner was damn near bulletproof though, and likely the most reliable engine you can buy right now because it's been on the market and unchanged for so long (the problems on the 2023 4Runner are widely known and pretty limited - rear main seal leak, some oil leaks from the valve cover gaskets, but all very rare).

So this new one has a lot to live up to. I like that it doesn't have an electronic waste gate actuator like the Tundra, but I'd still prefer the old V6. This turbo 4 Cylinder is very clearly a compliance engine with a lot of added complexity that consumers didn't really ask for.

This post was edited on 4/9/24 at 1:46 pm

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Posted by dewster

Chicago

Member since Aug 2006

25419 posts

Posted on 4/9/24 at 2:32 pm to member12

quote:
but any design with an electronic actuator operating the turbo waste gate is destined to be problematic. There's just too much heat right there for electronics to manage that.

Look under the hood of the new Tundra. Anyone accustomed to Toyotas or most domestic gasoline pickup trucks would get really nervous about what they see there. Plastic hose connectors, a fairly short twin turbo motor that is pushed way back into the firewall for some reason, spark plugs on the back two cylinders that are extremely difficult to reach with normal tools, and an even bigger spaghetti maze of coolant lines than most new vehicles.

I don't know if it was because their design process was truncated by the pandemic, but Toyota built that new Tundra in a way that will make it very labor intensive to repair as it ages.

quote:
I like that it doesn't have an electronic waste gate actuator like the Tundra

That's encouraging. I guess even Toyota knows that they screwed up the Tundra if they have corrected the turbo design for other models.

They should not be making things more complicated than they absolutely have to be.

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