2011+ Ford F-150 3.5L GTDI Ecoboost Engine P0299 Turbo Underboost Quick Diagnostics

In this video we show you what to check before replacing expensive Turbos.

This is the Vacuum/Pressure Tester I Recommend:
Latest Ford Blow Off Valve-

Forscan is free Ford Specific Diagnostic Software:
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The information, demonstration and any content contained in this video is for informational purposes only. The user and BSG Automotive (hereinafter “FordTechMakuloco”) makes no warranty, express or implied, regarding the effectiveness or safety of the contents of this video. In no way should the contents of the video, including the tools used, be repeated or tried by anyone. Viewers should only seek the help of a trained professional located at a licensed auto repair shop for any fix, modification, alteration, or any change to their vehicle. FordTechMakuloco shall not be liable for any injury, damage, or loss to any person or property that may result from use of the tools, equipment, or any content contained in this video. In addition, there is no way to guarantee that the video is not altered or modified or is not in the final form submitted by FordTechMakuloco and therefore, FordTechMakuloco does not warrant that the video is unaltered or not modified. The links on this video to products are for informational purposes only and in no way are an endorsement of the safety or effectiveness of the particular product. Viewers understand that anything contained in this video or linked to or from this video is the sole responsibility of the viewer and in no way provides an express or implied warranty as to the safety or effectiveness of any linked tool, product, or video. Therefore, viewer agrees to release, waive, and discharge FordTechMakuloco or anyone affiliated with FordTechMakuloco, from any and all liability, claims, demands, actions, and causes of action whatsoever arising out of or related to any loss, damage, or injury, including death, that may be sustained by the viewer, or to any property belonging to viewer, regardless of whether the loss is linked to the use of the contents of this video, or otherwise and regardless of whether such liability arises in tort, contract, strict liability, or otherwise, to the fullest extent allowed by law.

[FordTechMakuloco]

This is the Vacuum/Pressure Tester I Recommend:
Latest Ford Blow Off Valve (2013+)-


Forscan is free Ford Specific Diagnostic Software:
Download Here-
ELM 327 Adapter I Recommend-

As an Amazon Associate I earn from qualifying purchases.

[catfishmark]

Nothing like a mechanic who knows how to diagnose a problem rather than a mechanic who only knows how to replace parts.Great video as usual Brian.Thank you Sir.

[russellfisher]

Awesome video Brian…really helped me in fix my 2013 F150 3.5L that had P0299 code!
Just as you suggested…my blow off valve had a hole in the diaphragm!

For other DIYers...when I replaced the blow off valve on my truck, I did some extra steps that helped me:
1) I removed the underbody wind deflector to give me more room to maneuver under the truck
2) I removed the resonator mounting screw allowing me to rotate the resonator up counterclockwise
while still attached to get better tool clearance to remove the blow off valve screws

Like Brian predicted…I broke the left side screw in process of removing my old blow off valve. The screw I used for replacement
was Ford part number W507065-S437 ... get quantity 2 to mount your new blow off valve with new screws.

Took me 25 minutes to complete the job including removal and replacement of the wind deflector.
I cleared my code and started the truck….no check engine light and had turbos again!

[adammccullough]

I know very little about working on cars but when my under boost code came up I came to YouTube before going to the dealership. $50 and 10 minutes later, my 2015 F-150 ecoboost is like new again and no check engine light. Thank you for the video!

[johnviewer]

Aren't we lucky to have Brian on are side...thx Brian...

[stevenlefebvre]

You are a true talented mechanic hard to find nowadays. I wish I could have you working on all my vehicles

[wolfmangangster]

I had the same code in my 2014 3.5 ecoboost. All the hoses and connectors checked out fine. I pulled out the pressure relief valve and didn’t see any noticeable tears in the diaphragm, but I ended up replacing it anyways. After clearing the codes, the problem never came back and I have the turbo boost back. Moral of the story is just because you don’t see a tear in the diaphragm, doesn’t mean the valve hasn’t failed :)

[joshlstc]

Thank you very much for this video. I got a CEL for low turbo boost pressure while traveling in the Rockies recently. Went through all your steps and found that my blow off valve had a hole in the diaphragm. Luckily I was able to get a new one at a local dealer, throw it in and enjoy the rest of our vacation with plenty of boost in the mountains. This was most likely what I was hearing previously (mooing sound while accelerating) and the thin air in the mountains made it more apparent. Thanks again for the help.

[NoFlightPlan]

This video just saved me a bunch of money. The large hose for the air inlet coming out of the turbo had popped off. Check engine light came on during a 400 mile trip, and the truck was running like crap. Put the hose back on, tightened the hose clamp, and it’s the best the truck has run since I bought it 9 months ago. I think it was working itself loose for a while.

[cessealbeach]

Man I have seen a lot of Automotive Repair Video's on Youtube, Your Videos are the BEST, Very Clear and your instructions are Super Clear also ! Thanks

[Alex-pxmb]

Twice the hoses, twice the clamps, twice the wastegate diaphragms, twice the oil lines, and a big ol' intercooler mounted up front, down low, with nothing shielding it from road debris. What could go wrong? Then there's this gimpy blow-off valve mounted on the back of that. With bolts that rust solid. Thank you again for your videos. You're saving people's sanity, not just their money. Very methodical which is key on a complex beast like this one.

[randywheeler]

My check engine light came on the other day so I took it to a repair shop to have it checked out today and was told my turbos needed replaced glad I found this video I am going to do some troubleshooting myself before I decide to replace my turbos

[titaniumman_]

Ramble on Brian...I’ve learned so much watching you to help me maintain my own 2012 EB.

[fulldraw]

Thank you for saving me thousands of dollars!! Never been so happy to see a little tear in my life 😂. Went to the dealer for the P0299 code and of course they didn’t actually diagnose anything and just wanted to immediately replace the expensive turbos 🙄 asked them to explain how they knew they were bad and they made up some lie about “the wastegate being so loose he could move it with his fingers”. Obviously, not true. And even then, I asked well why not just replace the wastegates themselves then? “We can only replace the whole turbo assembly” …gimme a break!! Appreciate your videos a lot! Can’t trust anyone these days… might as well learn to do things myself

[ftbymikeD]

Kudos to you Brian for pointing this out. Makes you wonder why Ford or the aftermarket doesn't offer a stone guard for our coolers!?

[huntnfishnuts]

I found this repair applicable to a 2017 expedition with the 3.5, pulled the blow off valve from the intercooler and found a small tear in the orange seal was causing only an under boost code with no noticeable loss of power, great info for sure.

[nicholash]

This was the exact problem I just had, found the issue in under 5 mins thanks to you and this video, bought the part and now to wait for a few days for it to get in. Saved a trip to the dealership and the ungodly amount of money they would’ve charged to troubleshoot and then to mark up the part 100% on top of that. Ordered through your link on Amazon and was a touch under $50 and will be about 20 mins total of my time. Thanks again! 2014 with 59k miles

[peleger]

Just saying that I'm so glad I found your videos. I've said it many times that I hate my 2012 FX4, but I'm stuck with it, and these videos are the best by far I've seen. Thanks! You've saved me $$ and time!
Shuttering again, 35 mph or more if give it gas, loses power, CEL flashes, I've had it before. Changed throttle body. This time cleaned it, sensors, new MAP installed, improved for about 15 minutes....changing plugs next. Cheap...to expensive. Heck, I've even changed out the 'brain' in my tranny before.

[MrImportcartech]

I'm a ford dealer tech. I 2nd this video. This guy is spot on. I only do driveability issues. Seen this several times. I dont even follow the pinpoint test anymore.

[spencer]

Thank you for all the in depth videos. Very helpful. I spent all day yesterday changing out all the fluids under my F150 it has 88, 000 miles on it. I couldn't believe how black and nasty the fluids were. So thank you for the heads up on not going by the manual intervals of when to change fluids. Thanks for saving me lots of money down the road. Have a great day Sir.