Chevrolet 1500: P0446 EVAP Vent Performance

In this video i have a look at a 2003 Chevrolet 1500 that has a P0446 Canister Vent Valve Performance code stored in it. Before you load the parts cannon have a look at the system and see if the vent valve is really the issue. -Enjoy!
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Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

[@jeremyhundley3142]

I can't be the only one going You didn't plug it in... You still haven't plugged it in.. Eric, plug it in!

[@johnaclark1]

It's always great to see the pros make the same silly mistakes the rest of us do. I don't know about everyone else but I prefer when these guys leave their mistakes in. I learn as much from their mistakes as from anything else.

[@davidca96]

I was gigglin' knowing hed finally realize it was unplugged. We all miss the easy stuff occasionally, I know I do! Tell you what though, some of the stuff ive seen him do on here I wish he was here in Michigan my truck would only go to him for everything.

[@kenrieve9711]

See how well he's teaching us, that was a pop quiz!

[@richardcranium5839]

ya ding dong

[@emmettthompson3332]

I saw the same thing. Thought, is there some magic going on here?

[@ring-and-run]

Every time I watch, I learn something new! Thanks for the insights.

[@anthonythompson4110]

This week we had a caddy in for a lean condition. I was scrolling through the data on the scanner and found that the mass air flow was only registering 3 grams per second. I distinctly remember in one of your videos that GMs.should be closer to 5.5. my coworker said it was fine. It bugged me. Sure enough, I looked it up in Mitchell and found that it should be 4-8 at idle. Tried cleaning it, the money light came back on,. co-worker was giggling. I checked the data again and still couldn't get but low 3's out of the mass air. Changed it, and like magic, the airflow grams went up, fuel trims corrected themselves and once drive cycle completed, I inspected it and shipped it. Thanks for the videos. I grew up spinning wrenches. After 11 years in the military, and 12 years in a mill, I got back into it and am constantly trying to educate myself. Thanks for your very informative videos. You help tremendously by not showing just the answer, but the diagnostic road to get there

[@wills.5762]

I have a '99 Silverado, and did the mass airflow, took it out for a quick rip and it was still runnin shitty. Money light wasnt on, but with OBD data the sensor was reporting exactly 3 (iirc) g/s, regardless if im sittin there or full send. Really threw me for a loop. So, I take it all apart, pull the airflow sensor out, clean it, have a goodly gander at it, put it all back together and walk away...and then realize for the second time, now, I've forgotten to plug the damn thing in

[@aparks5595]

Rule of thumb is 1 g/s per liter at idle, and if memory serves me, it’s based on a 600rpm idle at that

[@RyanHull76]

@@aparks5595 - That's exactly correct

[@pbau7769]

Would a mass aiflow sensor(p0101) trigger P0446 or PO449? I hav both the 101 & 449 on my OBD. Thanks

[@crisprtalk6963]

good story!

[@doublestuf11-67]

I love watching ur videos because u always go the extra mile and look at the whole system step by step... scan tool first every time. 👍

[@tonychandler8908]

You have helped me so much to understand the systems on these vehicles keep up the great work

[@johndondero8619]

I’ve watched a lot of your videos. Love that your a great family guy and your videos show you are an expert in the field. Tx for helping me learn on stuff. 👍

[@holsterseven]

Love this stuff as I repair all my own GM vehicles. The older ones had more problems. Just did a no crank on my 05. Found it was a ground problem. Thanks so much for the vids.

[@davidcompton1105]

Love you videos I try to watch everyone you make even if it's on something simple thank you for the content you could be one of the best mechanic I have seen

[@65bugnut]

Good job mister O. We had the classic leaf blower, we were only missing the air compressor.

[@ChingoMandinguez]

This video was a tremendous help, been battling P0446 on my '05 GMC, and this really helped me understand the complete the system! THANK YOU!

[@carlosolvera72]

In my 4 year automotive career I have learned way more about diag from your videos than the "training" I had at work.

[@chandlerfoley4826]

Too bad everyone doesn’t diagnose like this. Too many people find a single issue and stop at that. What an excellent tech! Coming from a tech, these are the kind of people that should work on vehicles! Great job Eric!

[@pauldavis5075]

OOOOH nice new lift. Feels good like a riding on a new set of tires. Have a great autumn day in new england, I am envious.

[@davidnielson5252]

You noticed that too. Saw those bright yellow arms and grey instead of blue towers and said, "somebody got themselves a new lift!" Bet Josh is happy.

[@scottshelton318]

You are the best. Keep it up. Your family has to be proud of you for the knowledge, and the time it takes to make theses videos.

[@metoon3092]

Diagnosis and Testing,.You are such a rare Bird , in Today's Part slapping repair shops. As always, a Great Job.

[@Rik.B]

I love the fact you are just as enthusiastic about only doing a diagnosis as you are about actually getting the job. Here in the UK garages hate, and even refuse diagnostic only work. Only option a lot of the time is to hire a auto electrician who is mobile and charges three times what a garage would do per hour, or dealership who are extortionists as well. Your way are so refreshing. I check every day for your videos, after all these years, I still love get excited to see a new video posted.

[@CopCat34]

Great video. Multiple issues are hard to diagnose. Thanks for showing how to follow a multiple issue job.

[@mikebiron7339]

Man, I wish there was a new SMA video each day. How I luv me some good ol car fixin.

[@fastsmogr]

Great video sir. Love the commentary you sound like the sort I could sit and have a drink with. thanks for guiding us through.

[@jaydog7428]

New viewer..love your videos, spent my whole staycation relaxing and learning from your past videos.

[@TheJmich2001]

Good to see you again. Thanks for getting me hooked on Neutral Drop!

[@daviddelle774]

Thank You, Thank You, Thank You!! I was honestly going into SMA withdraws!!

[@Bd1ddy1]

Awesome video. Tells me exactly what I need to look at for the code I pulled. Thank you!

[@KWsandman]

Going through SMA withdrawal but did get to see his brother (Doug) yesterday when he yanked my 10 wheeler out of the ditch. And now today a new vid, win!

[@thomas000187]

Eric O.... I think I've watched every video you have ever made. I must say, you are basically the KZbin diagnostic god. Yeah there's others, but none that compare. Thanks for what you do. Your legacy will live in the minds of hundreds of thousands of people you have truly helped educate in this line of work. Ur an awesome guy Eric....

[@on-site4094]

Great diagnosis with the scanner the vacuum test was old school 👍 lol thanks for sharing

[@christopherbradley5456]

Love watching your videos. Your sense of humor make working on cars interesting and fun......lol

[@daleanddarrenfredrickson5453]

Very informative and fun to watch! Thanks for sharing, what a great video.

[@brianpeters4486]

Lots of shops don't want to just diagnose. Shows what a good shop you are to work with the client in what they need. This is another reason you could up your diag only charge. Anyone with common sense would gladly pay to get accurate and honest diagnosis.

[@7daystodieyeahbuddy919]

I wish BOSCH would make a scan tool I could connect to my WIFE to scan her and find out what is wrong with her? She is running pretty rough lately. Lots of backfires and squeaky noises. Life would so much easier.....Thanks for video Mr. O.

[@ralfie8801]

7 Days To Die YEAH BUDDY You don't know what's wrong with her? Maybe I can help. Women are all broken, every last one of them comes from Woman Manufacturing LLC broken, warranty voided, and they can't be fixed. There are no spare parts, they don't even get new parts when they are on the assembly line. That's why they all are broken when they come from the factory.

[@7daystodieyeahbuddy919]

​@@ralfie8801 Well that is news to me, No warranty? I did not know that? This should have been told to me BEFORE I married her. I thought maybe an eye exam would have fixed the issue. My wife can not see the **Check Engine** light when it came on. So now instead of a possible small fix to my car, I have to replace the entire engine. I am thinking of replacing her with a different model? Maybe I can try going gay? Are guys broken as well when they come out of the Men Manufacturing LLC? Thanks for the advice.

[@ralfie8801]

7 Days To Die YEAH BUDDY Well, I told you she was broken! As far as men go, I guess it depends on your perspective. Most of us didn’t come out if he manufacturing plant broken, but quite a few of us were broken after marrying a broken shemale without paying attention to the head on our shoulders instead of that other one.

[@gabrielmorales4612]

Soild joke

[@trryhin]

I was saying "uh, I think you forgot something" when you left it unplugged!!! Glad you didn't edit it out.

[@GC-kw1gq]

Not as bad as attaching an oil catch can to those connections. I did not catch any oil btw:(

[@jaredstrehlein5605]

Called "the honest mechanic" so few of them these days, but some still exist however. A sad fact in 2019.

[@bobbyschroeder7068]

I am a technician as well, is it bad that I like watching somebody else fix stuff instead of me? Lol... Great vid as always

[@HouseCallAutoRepair]

It helps to add knowledge and experience... It also offer an often, new way/different way of doing some things. I love learning new "tricks" to speed up my diagnostics!

[@Dumbass_mechanic]

I'm also a technician, if I'm not fixing stuff I'm watching someone else fix stuff or else break stuff on youtube here. I've been wrenching for over 25 years and still learn things from Mr. O here. I also try to share some of my relevant experiences in the comments when I can

[@jaredstrehlein5605]

Its called Professional Development. Keep the mind in tune

[@neverstoplearning382]

Same here pals. Regards.

[@sparky72]

Means you’re management material!

[@RandomPerson-su3xg]

My dad's '06 has the same issue. Replaced purge solenoid, canister vent solenoid, and tank pressure sensor. Even my Grandfathers '98 has a similar evap issue, which I hear is common on most years. The rust around the pump retainer ring is present like you said. I will attempt the canister test to see whether I need to replace it or drop the tank to fix the retainer clip/gasket. Thank you for the lead.

[@sumduma55]

I think it is awesome that you do not mind diagnosing the problem and letting the customer fix it themselves. I've seen shops act like you are taking food off their children's plate when you decide you want to do your own work. There have been times when I was too poor to pay attention. Not having a car to get to work would make things worse. Without a lot of diagnostic tools or the ability to fund a parts cannon, sometimes having a shop get you in the right direction was neccesarily the difference between paying rent and an endless cycle of cash advances and a hole that is very hard to stop digging.

[@chiniakwalker]

Great , I've replaced the one under the hood twice still had check engine light pop on reset truck many times and replace the one on the gas tank also still had same problem... But after seeing this part about the canister I decided to follow your steps and blowing into canister,, . Found the same problem you just showed almost identical gas run down my hand and into my sleeve . Never would have identified this problem with out you video ty .. ordered new canister should be in few days . 2003 Chevy Silverado 4x4 no telling how long it's been that way but I've had this truck 3yrs now and was only able to understand the problem ty again!

[@rumrunner1756]

Love watching the Bill Nye of mechanics. Thanks for the upload Eric. 👍

[@RedfishCarolina]

That's so rude. Eric is an actual mechanic. Nye is NOT an actual scientist. You want a real scientist, Sir Martyn Poliakoff on the "Periodic Videos" channel would be a better comparison. Not Nye.

[@adamtrombino106]

Nice and easy, quick and sleazy test. I have to agree that the stuck purge sol most likely sucked raw fuel into the canister. Either that or the guy is prone to overfilling the tank... Nice vid!

[@autotech2143]

Holy cow Dr O. I think you sent the cold weather down to TX. Woke up this morning and it's about 45-50°f. I needs to get my long Johns, coat, beanie, another layer of long sleeves, 2 or 3 pairs of socks, extra thick Dickies, and gloves. Also need to dust off the old heater of get a Kerosene jet heater. Great video by the way.

[@ethelryan257]

You didn't plug it in and you blew the Chevy. Eric, You are the best diagnostician in the industry, hands down. You also have found a way to leave my sides splitting with laughter. Thank you!

[@rossmangicaro3113]

Another great video from South and main. Thank you

[@blair683ify]

Finally a SMA video. I was going through withdraws.

[@johnerway7255]

Eric, it's good to see, we all can watch you forget to plug the purge sol back in, lol, great to see your normal, every once in a while!!!! Your real guy, oh, yes I setting here watching, with me new South Main Auto shirt on. Thanks for a great vides, again.

[@germanjesus]

If you have fuel in the canister then the fuel lines have been reversed. U made me howl about u trying to get the switch in the valve to work unplugged. Great vid

[@NEUTRALDROP]

True professional put that window down 3/4! man I lost your message about doing a meet up you said you go to Staten Island would love to do that sometime in the future thanks for the shout-out man a lot of people said they came from your Channel from your recommendation!👊😁

[@williegillie5712]

The neutral drop guy. I still haven’t seen your videos. I’ll have to check out your channel.

[@NEUTRALDROP]

@@williegillie5712 what are you waiting for

[@aaronshensky9385]

@@NEUTRALDROP he's definitely missing out. One of my fav channels. What's it got STUNTMAAAAAN! WOW FOLKS WOOOOWWWW

[@SouthMainAuto]

@@aaronshensky9385 By far the best channel on KZbin! STUNNNTTTMAAANNNNN!!!!!

[@SouthMainAuto]

I'll shoot you another email cameraman

[@gavinhix]

You are an awesome Master Mechanic/Investigator.

[@travismeek2627]

Dude, great content and thorough diagnostics!

[@philipallard8026]

Hope the deer hunt went well. Glad you are back

[@geologic740]

Good diagnosis. Thanks for the video.

[@mikechiodetti6737]

I'm yelling "You didn't plug it in!" And laughing when you found it calling yourself a ding dong. STILL! Great Diag! Focused on and found the problem right away! The older GM and Ford systems like that one were fairly easy once you figured out how they worked. I forgot about the canister line to tank shut off valve in the tank. Good Show Mr. O! Thankyou. Oh ya, the stay here, don't move, Great Comedy Relief!

[@davidalcaraz6003]

I learn a lot from your videos Keep it up !

[@vivillager]

Very important not to allow too much vacuum into the tank. I replaced a rusted out tank in a 1993 Chevy 6.5 Diesel, along with the fuel cap. I drove about 350 miles and stopped to refuel. When I tried to remove the cap (which is supposed to vent under vacuum), I ended up having to pry it off. The brand new tank that used to hold 32 gallons now only hold about 20.

[@MosinMan76254]

Sometimes you open up a can of worms. Thanks for another great video Eric!

[@waltherlegacy]

Thank you for the thorough explanation!

[@raymondhorvatin1050]

Good call and great troubleshooting

[@davecampbell7326]

Great video👍. I can fix just about anything on a car or truck. I’m just not much up on emission controls. I have an ‘04 Chevy 1500 and you have schooled me on checking and not guessing. I can’t afford a scan tool like you have but I have a BlueDriver, yeah I know not the same thing but I believe there’s a live data feature. Now with some better knowledge from your vids I have somewhat a better understanding of my EVAP system and what’s going on. Movin’ forward. Thanks man!

[@kevinb.5219]

Great Explanation, I enjoy your videos.

[@stacydornan9765]

You need to teach at a college or university BRO.Your an awesome teacher with patience, god bless Eric

[@georgebrandt6247]

That truck is pretty clean considering its age, mileage and location.

[@kevin9c1]

I bet he bought a high mileage low rust example from somewhere else. Good for him.

[@MichaelVictorious]

I was thinking the same thing. If I pulled a 2003 into my shop that was that clean I'd be buying lunch...lol

[@elmoz71ls15]

Probably bought from down south. My 2000 Silverado looks like that underneath here in Georgia

[@floydervin2897]

eric o such a good guy always takin care of customers

[@jonclark1288]

When I saw the thumbnail, I thought that was blood dribbling down your hand. Glad to see the Chivvy didn't bite ya!

[@ozzykrahn806]

Anybody who buys a gm is getting there head bitten off

[@SurferJoe46]

I like it when you interact with your younger apprentice. Good rapport is important to attract good help. Being mean, contentious or short with them just discourages future techs, and we NEED new techs.

[@jbrhel]

0:53 "Always risqué" in a Chevrolet"; priceless. I'm a newer sub and missed this one.Thanks!

[@jamesbruno5896]

Another excellent video thanks Eric!

[@rgarc69]

Thank you very much, you have helped me out tremendously

[@tompeterson3210]

Another wonderful video watching Dr (not a brain surgeon) O at work!

[@gushamilton5188]

oddly I don't even have this problem and I was still watching.

[@donalddavies5403]

clear and succinct. a joy to watch . thanks

[@garybaker5115]

Great vid, very informative. Easy to follow. Wish you were in my area so you could work on my truck.

[@EM-oe4rx]

Awesome tutorial, thank you very helpful

[@Ireland-bc2gx]

Eric o honest as the day is long great mechanic, great vids

[@rickfreeman9530]

Hey buddy your info always helps me out. Being an auto body tech I noticed the way you smacked on the purge valve. You ever thought of workin dents?? I thought I was the only one who forgot to plug things in. You were on a roll buddy! I just gotta give you a little crap!! Thanks for your helpful video's they really help me out on the mechanic side of things. From the Big Sky Country of Montana!! R.F.

[@shandajohnson8540]

Awesome thanks!! Huge help, and best video!

[@atrahasis3899]

Several double blind studies conducted between 2009-2016 indicate that plugging in diagnostic equipment, as well as properly connecting leads to power sources dramatically increased the chances of successful diagnosis as well as function of diagnostic equipment. A few fringe studies involving divination and psychic events produced results that require further investigation, but as of this time, ASE standards continue to mandate connectivity.

[@parochial2356]

But correlation does not prove causation... :)

[@grandematapalo]

@@parochial2356 But can be deemed a contributing factor.

[@BigBadJones]

I'm working on this exact issue. P0446 and sucking when I open the gas cap. Watching your videos and I'm wishing I had a scan tool like yours

[@wyattoneable]

Most excellent diagnosis.

[@billdoell990]

Thanks for info. Love the president, you mention. Miss him.

[@Tomgillchevy]

Thanks for sharing! Very informative and entertaining

[@comingundone27]

03 and the rockers are still in tact....Not bad. Also nice new lift!

[@dogguy2012]

another diagnostic job well done!!

[@NebukedNezzer]

I like this video especially because I own a 1999 silverado 2500 and now I know how to trouble shoot the fuel tank vent system. Just this summer I had my fuel pump replaced with OEM because it started making noise.

[@bobbyorrsr.9176]

Great video SMA!!!

[@TheMstwntdLMSV123]

I absolutely love this channel. I have learned so much from it and it's always entertaining. In the process of me learning how to work on my car (I'm in high school), I stumbled across something that has me stumped. I have an 07 Pontiac Vibe with 200k miles. I've noticed that it lacks pickup. One day, I filled it with 93 octane gas (being the 1ZZ-FE it only requires 87, so that's what I've always put in it) and it gave the car a lot more pickup. The only reason I could think of is if the in-pump fuel filter is clogged after 200k miles. Could this be the case? I searched high and low and from what I've found the only way to replace the filter is to replace the whole fuel pump assembly. That seems counterintuitive and expensive. Edit: Also may be worth noting the long term fuel trims are at -6% and short term are normal at +/- 1%

[@nandi0431]

Remember, "If he can do it, So can you" That goes for mistakes also guy's & gal's. Goes to show you that he is human. Just like the rest of us and makes simple mistakes to. Great job on explaining the process and the real difference between OEM & Aftermarket crap. People only see the price tag when buying parts these day's.

[@arthurjones5157]

Thank you for getting it done use your tips

[@TheDude666dude666]

Love it as always Eric!

[@edwardquintero7704]

Watched the 2003 Chevy PO446 repair video. This mech is a professional that use diagnostic troubleshooting to confirm the truck malfunction. Informative demonstration to repair its problem. Bravo!!!

[@TheCrystalGlow]

Hey! I see you’ve changed your recording to 60p for your video format. :) great job as usual good sir. Thanks for what you do.

[@garycox2253]

Great work Eric

[@boondocker7964]

Eric you are a vehicle brain surgeon, sorta, kinda. I is amazed by Josh and you.

[@scurfie2343]

Lawnmower guy!! You know he sees you with the camera and fires up his mower.

[@johnsteczak4975]

Easy to follow and helpful

[@petejuarezjr]

Great video, keep up the great work...

[@fastturbo7150]

great video as always thanks for shareing

[@CarsonAllen007]

Can we get some more normal day at the office? Love those videos!

[@kevinbarry71]

Finally! Going through serious withdrawal over here.

[@2trkpony471]

I think he was out hunting Bambi's Mother or father?

[@chrisschultz6541]

Was hoping it wasn't due to a family issue. But just an operator error. Phew...

[@kellyconstenius676]

Me too. I did not believe I was an addict. But then I noted.. Its been 5 days!!! ARGGGGGGGGGGGG!!! " Hi My name is Kelly and I am an addict. And its been 5 days since my last fix."

[@2trkpony471]

Perhaps Eric ran out of "the good stuff" or wait for it,,,, brake cleaner?

[@donnierobertson3088]

Great job again like always

[@montestu5502]

Lawnmower guy getting in all he can before the snow flies.

[@chrissmith6563]

And then the snowblower comes out.

[@montestu5502]

Chris Smith - Right! There is no escaping the noise!

[@jessesalcido2562]

Great session!! Thanks

[@ganeshnarayan5505]

Great video Mr.o from Fiji islands.

[@mrdfarms9373]

Lawnmower guy, air Compressor and phone ringing.......it wouldn’t be South Main Auto on KZbin without any one of these three going on 👍