How to Fix Car Hesitation (Code P0171)

Car hesitation, Code P0171. How to fix car hesitation when accelerating by replacing leaking intake manifold gasket, DIY with Scotty Kilmer. How to fix intake manifold gasket leak. How to replace intake manifold gasket to stop leaking. DIY car repair with Scotty Kilmer, an auto mechanic for the last 46 years.

⬇️Things I used in this video:
7. Common Sense

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[scottykilmer]

Things I used in this video:
7. Common Sense

🛠Check out my Garage to see what I use every day and highly recommend:

❗️Check out the Scotty store:

👉Follow me on Instagram for the latest news, funnies, and exclusive info / pics:

[spelunkerd]

I like it when you start with a very simple classification of the problem, too much air or not enough gas. But it's experience, knowing that on that engine the intake gaskets fail, that allows you to jump right to a definitive test. It's why the more challenging problems are more educational, since the veteran can't take shortcuts.

[ivankulya]

I just put the intake manifold gasket without testing it with carb spray. Glad to find out that I was right, the old one was sitting flat and it was completely covered with dirty oil. Thanks Scotty for saving the day!

[skeeter]

Scotty you're the man! This is exactly what was wrong with my Toyota. Car back to running with much better mileage and power now. This was a huge help to a nagging problem! Thank you!

[HermannWolflEssert]

The lobster isn't screaming, it just has a leaky gasket.

[marke.]

Mr. Scotty you just motivated me to do my DIY intake gasket replacement, you're now my guru :) keep being amazing sir! God bless you!

[TheKnightDragn]

Damn experience is really something, you make umbolting parts from the engine look so easy.

[armesisp]

Just had this problem on my Escape V6, fixed it by changing 2 faulty ignition coils and all the 6 spark plugs, on top of that they also cleaned the MAF sensor and flushed out the air intake system. Now the car runs very well.

[terrychristle]

Thanks Scotty. Kid home for weekend, car rough with this code. Tested, as per your video. $8 and 30 minutes later running smooth. He can now drive 4 hrs back to school! Thanks again

[diegogonzalez]

Scotty, u r making me rich by all the money u r letting me save

[chrisc.c]

When I saw your video the first time, I thought.... this is just another crazy guy on you tube.... after I finish seeing your videos, I realized how wrong I was and now in my opinion, you are one of the most Honest Nonsense mechanic in YouTube. I really enjoy your videos and have learned a lot from them. Thank you & keep doing what you do....

[scottykilmer]

Yes, another new Scotty video is up. Learn how to fix your car if it hesitates while accelerating.

[dinoBMXidiot]

This helped ALOT !

My car was showing a P0171, So I jumped into youtube and saw this same clip, ran back to my car, did the spray cleaner test while the car was runing and indeed it afected the Idle and behavior of the engine while running.

Now after, observing colsely, in my case, it wasnt exactly the mainfol gasked that was leaking in the air. It was acctualy the injector seal that wasn, t doing its job (i have a 2.3l ford escape2006 and the injectors are on the front of the head), and a replacement of the dount shaped little plastic pices made all of the difference. similar to what you demostrated here but slightly diferent area hat was not sealing properly. any way it was trough this test that i found what was happening to the car, so thanks Scotty.

[Fishy]

Thanks so much, now I know where to look next for why my cars a bit sluggish... For a topaz that's almost 30 years old I'd expect it may be the problem, I already flushed all the fliuds, changed all filters, cleaned out the throttle body, new idle control motor, throttle position sensor, and spark plugs and cables.I'm still learning all this stuff, really appreciate your videos. no one will teach me cuz I'm a girl so I have to teach myself and I have fun doing it ...can't wait to see what you post up next

[ScubaCat]

I had to do this on our 2002 Windstar.  Just a tip to those of you who may attempt this - this video is exactly what you do, except if your intake has a coolant passage or two (you can tell by the coolant color around the hole), you must change the oil and filter before you crank the engine. Otherwise, you'll have some coolant in the crankcase which will destroy your engine bearings.  As always, this is an awesome Scotty tip though -- those gaskets are cheap but paying a shop to do this simple task can cost a ton!

[datchulo]

I think I can speak for everything in saying I appreciate your videos, your responses to our questions and advice you have given us . Thank you Scotty!!!

[northstar]

Should also clean the throttle body and MAF while it's apart.

[Johnslist]

Perfect, this was served up to me, after I cleaned my MAF sensor for the third time. I suspected it could be air cleaner (but cleaned that twice) or vac leak, but couldn't find anything. Now I have a backup plan if this last cleaning doesn't do, I've been hesitant to buy new MAF but others say they do go bad (just unlikely for Toyota). If the light returns (or might anyway) can of carb cleaner is ready. Thanks!

[seans]

you are the man... gonna do this next paycheck... Got my codes read and found this video and low and behold this is my exact car so I have a feeling this might be the exact problem... Thanks again for a straight to the point video!

[johwi]

Thanks for the tip. I have converted my -96 Ford from gas to E85 and not getting it to run 100%, fault p0171 keep comming up no matter what fuel pressure I adjusted it to. 3, 5 bar was the most optimal. I did not think of the gasket, now I am checking that too!