TRD Cold Air Intake Install 5th Gen

 In 5th Gen Mods, Install, Performance, TRD

TRD Cold Air Intake (CAI) Install 5th Gen 4runner

TRD Cold Air Intake CAI Install - 5th Gen 4Runner

Step By Step TRD Cold Air Intake Installation on 4Runner

This is a step by step guide and installation for the CAI on the 5th Generation 4Runner.

There was a lot of comments on the forums talking about the CAI not being compatible on the 4Runner. The TRD Intake does fit on the 2014-current 4Runner.

The whole process from start to finish took about 2.5-3 hours, and this was with two people. If you are doing this on your own, I would say you would be looking at 4 hours. The only difficult part about installing the CAI was the wiring.

Separating the wires and rerouting them along the loom was really the only detailed part of this whole process and even that was pretty easy.

Step 1 – Pop off the Plastic Engine Cover with T logo

TRD Cold Air Intake Install - Step 1

There are a few plugs that the cover snaps into, just gently pop them off all the way around. I think there were about 5 of them.

Step 2 – Remove Brackets & Screws

CAI Install - Step 2 - Remove Brackets & Screws

This may be the most time intensive part of the install. Removing the bulky, clunky portion of the air box requires removing all brackets and screws noted and circled below.

Step 3 – Remove Air Box Brackets

CAI Install - Step 3 - Remove Air Box Brackets

There are a total of thee brackets that are attached to the lower and upper air box. Grab a screwdriver and pop them off.

Step 4 – Remove Upper Air Box

CAI Install - Step 4 - Remove Upper Air Box

Once the upper airbox clamps are off, you can remove the OEM upper airbox.

Step 5 – Unscrew/Mount Lower Air Box

CAI Install - Step 5 - Remove Lower Air Box

Remove the lower airbox by unscrewing the lower screws and one bracket on the outside of the box.

Step 6 – Pull Out Lower Air Box

CAI Install - Step 6 - Pull Out Lower Air Box

Make sure to tuck all your wires connected to the lower/upper airbox in a secure location. You will need to reuse these wires again to line the MAF (Mass Airflow Sensor).

Step 7 – Electrical Wire Separation

CAI Install - Step 7 - Electrical Wire Separation

This portion is the most “complicated” of the install process. I say “Complicated” because it’s really not that hard. It just takes a bit of patience.

Step 7A – Electrical Wire Separation & Tape

CAI Install - Step 7A - Electrical Wire Separation

  1. Remove all the electrical tape from the MAF hub
  2. Use a razor blade or sharp knife to slice open the connection tape
  3. Be careful to not slice into any wires
  4. Once sliced open, remove the excessive electrical tape
  5. Start separating MAF (Mass Airflow Sensor) wires from other wires
  6. Pull MAF wires down to the bottom where they draw from

CAI Install – Step 7B – Electrical Wire Separation, Split loom & Tape

CAI Install - Step 7B - Electrical Wire Separation

  1. Separate the MAF wires from bundled wires and loom completely
  2. Make sure to bunch up both sections of wires and keep it tight
  3. Wrap electrical tape around each section of wires
  4. Re-loom both sections of wire
  5. Loom sections looking clean and tight
  6. Wrap loom with electrical tape and seal up

Step 8 – THE INTAKE INSTALL

CAI Install - Step 8 - THE INTAKE INSTALL

Step 9 – Inserting Both Male Connections into Coupler

CAI Install - Step 9 - Inserting Both Male Connections into Coupler

Inserting both of the male connections into the TRD intake coupler. This part takes some muscle grease. You don’t want to use any chemicals to help with pressing in the male connections because you don’t want any chemicals running through your engine. So keep the grease, lube and even WD-40 off the table and use your good ol’ muscle grease. Pictured here, you can see the pressure needed to push these male connections in.

Step 10 – Inserting Intake Coupler #1

CAI Install - Step 10 - Inserting Intake Coupler #1

Position the TRD intake coupler with male connections facing the cab so you can connect the OEM tubing.

Step 11 – Remove Plastic Piece from Tubing

CAI Install - Step 11 - Remove Plastic Piece from Tubing

Remove the plastic OEM tubing.

Step 12 – Attach Tubing to Coupler

CAI Install - Step 12 - Attach Tubing to Coupler

Attach the new male connection to the OEM tubing.

Step 13 – Remove OEM Tubing & Insert New Tubing

CAI Install - Step 13 - Remove OEM Tubing & Insert New Tubing

Remove the OEM tubing & insert new tubing (Provided by TRD in the TRD Intake Kit) back onto the OEM part.

Step 14- Connect Tubing and Zip Tie Tubing

CAI Install - Step 14- Connect Tubing and Zip Tie Tubing

Connect tubing to the additional male piece of the coupler and zip tie.

Step 15 – Insert Airflow Accelerator

CAI Install - Step 15 - Insert Airflow Accelerator

Insert the Airflow Accelerator into the open hole where the upper/lower airbox was located.

Step 16 – Remove & Save OEM Grommets from Lower Airbox

CAI Install - Step 16 - Remove & Save OEM Grommets from Lower Airbox

Step 17 – Insert OEM Grommets into new Lower Airbox

CAI Install - Step 17 - Insert OEM Grommets into new Lower Airbox

Step 18 – Install and Mount New Lower Airbox

CAI Install - Step 18 - Install and Mount New Lower Airbox

Using the OEM screws, screw the new TRD Intake lower airbox back down to the body.

Step 19 – Drop in Air Filter & Attach New Box Clamps

CAI Install - Step 19 - Drop in Air Filter

Place the TRD Intake Air Filer into the lower airbox and attach new TRD Intake clamps.

Step 20 – Add Grommet & Filter Minder

CAI Install - Step 20 - Add Grommet & Filter Minder

NOTE: Don’t forget to add the grommet before adding the upper airbox down.

Step 21 – Remove OEM MAF (Mass Airflow) Sensor

CAI Install - Step 21 - Remove OEM MAF (Mass Airflow) Sensor

Unscrew the OEM MAF (Mass Airflow Sensor) from the old airflow section.

Step 22 – Install OEM MAF (Mass Airflow) Sensor on Air Inlet Tube

Install OEM MAF (Mass Airflow) Sensor on Air Inlet Tube

Screw down the MAF onto your new TRD Intake inlet tubing.

Important Note: Use Loctite Threadlocker Blue 242 from Loctite Adhesives to screw down the MAF. This just prevents from accidental loosening.

Install OEM MAF (Mass Airflow) Sensor on Air Inlet Tube

Step 23 – Connect Both Couplers, MAF & Tighten Connections

CAI Install - Step 23 - Connect Both Couplers & MAF

Step 24 – Double Check All Connections and Couplers

CAI Install - Step 24 - Double Check All Connections and Couplers

DONE

If you have any additional questions, comments or suggestions, please leave your comments below. Did we miss something? Please let us know.

Last Updated on

Love the 4Runner Lifestyle?

JOIN THE COMMUNITY - FREE GEAR AND UPDATES

The latest in new 4Runner parts, products and gear. You also get a leg up on vendor specials, free gear, giveaway notifications, and more. Our newsletter is pretty much the best thing you'll ever read!

Get paid for an Install or Review

GET PAID FOR WRITING A 4RUNNER PRODUCT REVIEW OR STEP BY STEP INSTALL

Recent Posts

41
Leave a Reply

avatar
22 Comment threads
19 Thread replies
4 Followers
 
Most reacted comment
Hottest comment thread
28 Comment authors
James AcunaGggTim HortonThaddDavid Recent comment authors
  Subscribe  
Notify of
Rob Cushman
Guest
Rob Cushman

I just installed the TRD CAI on my 2018 TRD Off-Road. It was an easy install, looks great, and sound awesome. Great job on the instructions, I’ll be installing the Magnaflow exhaust later this week. Thanks for the DIY guides.

Cal
Guest
Cal

Was the install just a remove and replace?did you have to do any cutting on any Sheetmetal.

Enrique
Guest
Enrique

I’m so excited to hear you installed it in a 2018 4runner TRD off road, I just got one since the pro was 4 month wait..so decided on the off road and I’m ordering this for my whip. I will post once installed maybe I will through a video also. …

Matt
Guest
Matt

Rob did you use part# PTR03-89100 for your TRD Off-Road install?

Michael West
Guest
Michael West

The local Toyota dealership said the TRD Cold Air Intake (PTR-03-8911) will not pass smog certification here in California, yet two other dealerships said “no problem.” Somebody else said save the stock one and change it out before inspection, which seems like too much work. The service guy said “it’s not that the engine itself wouldn’t pass, but that the part isn’t “certified,” or words to that effect, and it is because of this that it wouldn’t pass. Any help?

Eric
Guest
Eric

I installed this on my ’17 TRD Pro, I am noticing a little bit of a whistle when throttling around 1800-2300 rpm. Have you noticed/heard of this and know a potential fix?

William
Member
William

What are the estimated gains from this mod? Does TRD give you details on how much HP this will generate?

Blake
Guest
Blake

Just installed on my 2018 TRD Off-Road. Installation was pretty simple, there was nothing weird to move around or anything… it was just install and replace. The most time consuming is removing the wrap around the wiring and then rewrapping. On the grommets, I had a small screwdriver handle that fit in the rubber grommet hole and was able to push the metal insert out one end just enough that the other end became that much more “squishy” and that made it so much easier to remove from the old box and install in the new box. This took maybe… Read more »

Blake
Guest
Blake

Just a heads up… for any California guys looking to installing one of these – I installed mine, I purchased it from a California and just received a California compliant sticker from the Toyota dealer for use on my intake. I can send a picture of the sticker if anyone is curious.

Jason
Guest
Jason

Tried to get a CAI from my local dealer ($408) here in CO and they told me the closest ones were in TX and Toyota has them on backorder with “99” on order. They said it could mean a few things, 1) They are behind on production, 2) they found something wrong and are fixing it or 3) They are coming out with a new product. Either way, unless I order online Im not getting one anytime soon.

Matt
Guest
Matt

Experienced the same – I didn’t leverage my local dealerships (price) but ended up attempting to buy through 2 online shops – only to be told they were no longer in stock. Third time was a charm for me.

Regarding the lack of availability – I did inquire and was told that it’s not related to a recall, just a backorder from Toyota with no clear timeline at the present moment.

Bill
Guest
Bill

Three questions: 1) I believe this has been beat to death, but the amazon link for PTR03-89100 indicates “does not fit your vehicle” (2015 Trail Prem). From all I’ve read it should fit so I plan to proceed. 2) does the plastic logo engine cover fit back on after installation of the TRD intake or not necessary? and 3) what are the attachments to the OEM intake tube (visible in Step 2 photo) that are not on the TRD intake?

Kyle Wilkins
Guest
Kyle Wilkins

Hi I was wondering if the dimensions are the same? I am getting a battery relocation kit and wanted to make sure my starter battery would fit over their still. Awesome article.

Shaf Syed
Guest
Shaf Syed

@Brennan,you not kidding about the pressure required to get the intake cloupler in. I spent hours just in that! I don’t think it makes a difference but I do not think you pushed enough of it though. I did not stop after first tapered end. I pushed it even over the next ring which is why it took hours. I did that to both the large and small OEM tube inserts. I did not think that the final look should have any part of the inserts exposed. So when I connected the hoses they sit flush to the intake cloupler.… Read more »

Chris
Guest
Chris

For all having trouble finding these in stock or on back order, my tech at the toyota shop by me hooked it up! You can order all of the parts separately, including the C.A.R.B. sticker in CA at once and get it in a day, if you buy the “kit” expect to wait a while. I literally ordered at 3pm on a Thursday and had everything Friday afternoon!

Shawn Pfeiffer
Guest
Shawn Pfeiffer

I first want to say that your site here is awesome, it has given me a lot of ideas for my 4runner. I have read the articles on the TRD CAI, and what vehicles it has been installed on. I just wanted to get some more confirmation that the TRD CAI will fit on a 2018 TRD Pro. Thanks.

Mark
Guest
Mark

I just installed the TRD CAI on my 2018 TRD Pro without any issue. There were some slight changes on where to secure the wire vs the directions that came in the box, but dealing with that was simple and straight forward.

Aaron
Guest
Aaron

Just installed the TRD intake on my 2019 4Runner and it fits just like all the previous years.

Josh
Guest
Josh

Does the OEM MAF sensor need to be re-tuned with the TRD CAI? It seems as though it would only be turned for stock airflow?

Matt
Guest
Matt

I just installed the TRD CAI on my 2019 TRD ORP followed instructions in the box and after reading everything here (THANKS!) the only issue I had and forgive me if I missed this but in step 18 reinstalling the Lower Airbox on that exact same bolt in the picture it was now longer and left a space so I used 3 3/8″ (M10) grade 5 flat washers to fill the space and get the proper torque. Happy to provide pictures. Thanks again really enjoying the new setup.

Matt
Guest
Matt

Matt, Matt here,

Was hoping you can show me what you meant by the bolt length difference. I plan to do the CAI on my 19 TRD OR as well. Do you know if this voids any warranty by Toyota ( sorry if asked/answered already)?

David
Guest
David

Now you’re making me paranoid I need to pull filter and verify. I don’t remember noticing any gapping on lower airbox. Bolts torqued up nice and snug. I installed on a ’19 TRD Off-Road. Also since I’ve seen some people asking, dunno if helps but…I was getting ~16-17mpg when I drove off the lot and for a couple weeks on my 100mi commute. Now averaging 18 or so. Can get up to 20 if I can stay under 80mph but screw that…woohoo TX130 Flip side is seems like I burn a lot more fuel when I stomp on it and… Read more »

Matt Montano
Guest
Matt Montano

Hey Matt
If you look at step 18 that bolt in the left corner was longer so I added 3 3/8″ (M10) grade 5 flat washers to fill the space and get the proper torque. I used part# PTR03-89100 as suggested here so I was a little confused but it’s working great and loving it. I bought mine from a local dealer (Cyber Monday) and I installed it using the great write up’s on here. According to my local dealer (Roseville) it’s all legal and does not void warranty. Hope this helps….

~MM~

Donovan Rayon
Guest
Donovan Rayon

Hello! Really appreciate all the good info on your site. I’m new to the 4Runner world and just purchased my first 2017 4Runner Off-road Premium and love it. I have been slowly upgrading step by step. I have run into an issue I wanted to run by you. Installed the new TRD CAI and all went well. It looks good and runs great…however, I actually lost just over 1 mpg after install and driving for a couple months. I was hitting avg 17.3 mpg. Now it sits squarely at 15.9 mpg. Is there something I could have done wrong? Could… Read more »

Donovan Rayon
Guest
Donovan Rayon

Not really heavy on the pedal, maybe just a tad 🙂 I just installed the MF exhaust today after I posted for the first time. Drove for about an hour and was very happy to see the MPGs climb from 15.9 to 18.4 and still climbing. I’m thinking the CAI works best in conjunction with the exhaust and it’s more efficient then just having one or the other.

Thadd
Guest
Thadd

I just installed the TRD CAI on my ’16 Trail. Took about 2 hours. The tubing is a tight fit, but with some playing around and muscle it goes together fine. It does look much better than the stock set-up and I noticed it sounds better. Will see about any increase in mileage, I’m guessing not much,if any, but a cool add-on.

Tim Horton
Guest
Tim Horton

Ordered the intake during the TRD 40th Anniversary sale (40% off MSRP) and installed it last night on my ’18 TRD ORP. My question is what are people doing to secure the wire bundle that was attached to the airbox and the air tubes. The bracket that was there to support the back of the air tubes will fit in the rear hole on the head, so I might just bolt it up and ziptie the wire bundle there. But if anyone has some pics of what they did to tidy up the wiring, I’d appreciate it.

Ggg
Guest
Ggg

So I got this and installation wasn’t too difficult. The problem I’m having is that I can’t seem to clamp the air box shut with the TRD air filter. I put the stock paper filter in and that was a tight fit too. Guess I’ll just run that for now.

James Acuna
Guest
James Acuna

On some of the other forums and YouTube videos, it seems like the very step these people say is to remove the negative battery lead on the battery. Is this necessary? Also, it seems like the going solution to some of the whistling noise made, is to “plug” a couple holes in the lower housing with silicone? I dont see this step in this tutorial, just curious if your thoughts on this?

Start typing and press Enter to search

GET 20% OFF!

Get Up to 20% Off the Trail 4Runner Store!
Your Email
Our content is pretty fire! We will never spam your inbox or sell your data.
BajaRacks 5th Gen 4Runner