Does Toyota Direct Injection Cause Carbon Build Up? Let's Find out!

Do you ever wonder if Toyota direct injection ( D4S ) System build up carbon? In this video we take a look at an in service Toyota D4S engine to find out if that is the case or not.

Toyota's D4S injection system uses both Direct and Port Injection. So in theory it shouldn't build up carbon. But does it?

In this video we have a 2017 Toyota Sienna with a 2GR-FKS engine which has Toyota's D4S System and we will find out if it does build up carbon or not.

I also share some tips on how to prevent carbon build, D4S System reliability and more.

TCCN Automotive Inc.
Toyota and Lexus Specialist Repair

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0:00 Intro
0:33 What is Toyota D4S System
7:17 D4S Reliability
9:03 Does it Actually Work?!
12:52 Should You Avoid Direct Injection Toyotas?
14:26 How to Prevent Carbon Build Up

[rayman]

I have been a Honda guy for very long time and just bought my first Toyota. This dual injector setup is one key reason for my switch. Toyota is getting it right and trying to do the right thing :)

[MPGunther]

You're always going the extra mile by actually showing the valves and that's greatly appreciated

[jimf.]

This man is more than a master mechanic. He is an absolute genius mechanic. A guru.

[stevenyoung]

Great info. After having been in this business for 34 years, I too say change your oil early and often. Don't buy into 10k mile oil changes on your vehicle. Your vehicle is quite often the second biggest investment in a person's life and needs to be treated as such.

[ericrzz]

This is the best channel on Toyota technology! Great explanations backed up by real world examples.

[OMAR]

As an owner of a 4GR-FSE engine currently pushing 180k, i can honestly testify that, yes the oil changes, using good fuel and having a long hwy commute does work. You Sir are absolutely correct.

[tssci]

Intake valve carbon is not the only problem with GDI engines. Damaging abrasive soot caused by incomplete atomization and burning of the fuel mixture. Causes carbon build up on oil control rings, and PCV system, air injection systems, etc, and causes excess wear of cylinders and timing chains. Fuel dilution is third problem. This shears the oil viscosity, reduces Film strength, oxidizes the oil. Combine soot, fuel and oxidized oil and you have significantly shortened engine life. All OEMs are struggling with these problems.

[joelrodriguez]

Brother for me this man is the best, GOD BLESS HIM AND HIS FAMILY

[danielnavarro]

I'm not even a Toyota auto mechanic but somehow I always learn valuable tips from the Car Nut.

[kcm]

so glad this system works. ive put so much faith in this system over the years, happy to see more sound engineering from toyota 😇🙏🏻

[HypocriticYT]

Few mechanics truly know theory of operation on modern vehicles. CCN knows his stuff 😊

[stevehoppenjan]

How can anyone not love this guy? AMD - you mentioned that some other manufacturers have figured this direct injection thing out and minimized intake carbon buildup. Can you tell us who besides Toyota does a good job?

[sdfiske]

I have a 2020 Honda Ridgeline with 85, 000 miles on. Recently I changed the PCV. ( No particular reason ) I just changed and I found the original one was not working 100% correctly. it was hanging up a little. Very easy DIY. The motor seemed to run a little smoother after I changed it

[jeffreymcdonald]

No need to get a speeding ticket doing an 'Italian tuneup", just downshift to keep the rpms up higher. That is the key.

[litespeed]

My mom just bought a 2018 Camry with 30k miles on it and she almost exclusively does short trips. We will do 5k oil changes with the OEM filter and the occasional 'Italian Tune-Up' thanks to you.

My Toyota has 160k and I hope to get another few 100k out of it. I'm following your maintenance schedule.

My family and I thank you!

[m.b]

This has become one of my favourite channels.

[mikechiodetti]

For years I've told people to get the vehicle out on the highway or freeway, get it up to the speed limit and hold it there! The more you drive it that way the better it will run and the longer the engine will last!
Change the engine oil and oil filter every 3000 to 4000 miles OR every 6 months, WHICHEVER COMES FIRST!
those two steps will help increase the engine's life!
Toyota's got the right idea with GDI AND Port Fuel Injection. Together they do a great job.
Thank you for this video.

[kengit]

You’re awesome! I watch your videos now almost on a daily basis. The knowledge you impart and your narration is just beyond excellent! I think of you as The Last Great Automotive Technician

[coloradoboo]

My Dad taught me about the Italian tuneup in the 70’s. We’d take the Chevy Malibu wagon out on the interstate and floor it for a few miles! (With the V-8, you can see the gas gauge going down!)

[vinces]

I believe my 2018 ford f 150 eco boost has both style injectors on it for the same reason of keeping carbon down, because they were having problems with the earlier models, only having direct injection carboning up