Trailblazer / Envoy / Others - Clean Mass Air Flow Sensor
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- Опубліковано 14 лис 2021
- In this video, I will show you how to clean your Mass Air Flow ( MAF ) sensor. This is for the 4.2L I6 Engine. It will show you all the necessary steps to remove it carefully, clean it, and reinstall it. It should cover the Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Oldsmobile Bravada and Isuzu Acender. It should cover model years 2002 2003 2004 2005 2006 2007 2008 2009.
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Disclaimer
I assume no liability for property or vehicular damage or injury incurred as a result of any of the information contained in this video. I recommend safe practices when working with any and all tools, including but not limited to electrical tools, power tools, pneumatic tools, any lifting apparatus, including jacks, jack stands, and automotive lifts, manual tools, chemicals, lubricants, and any other instruments used within the video. Due to factors beyond my control, 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 all above mentioned tools or equipment, or any other items mentioned above, and all information contained in this video is the sole responsibility of the user and not myself or Nexus Auto. Caution is advised and any practices by the viewer is at user discretion. Any tool or part recommendations or links are given for informational purposes only and it should be assumed to be bought at your own risk. I or Nexus Auto assumes no liability for any damages, premature part failures, or incorrect parts made from purchases made online, including but not limited to tools, parts, instruments, jacks, chemicals, lubricants, etc. - Авто та транспорт
Just wanted to say Thank You again! I replaced it on the kiddos rig and you saved him and his wife a few hundred bucks. ❤
Awesome news! Money saved is always a win in my book. Appreciate it once again! Thank you!
Thank you for the clear and concise instructions🤓.
You're welcome! 👍🏾
Great Intro popping out on the creeper! Thanks for putting this video out here. I'm not sure I would have found the gray tab without it.
Thanks for the awesome feedback! Much appreciated. Happy to hear the video was helpful!
Thank you, you were the first one to show how to do it and not just saying, this is the old one, thats the new one I installed. 😂
No problem at all! Appreciate that feedback!
Didn't know where it was. Thanks
No problem!
Thank you for the video. Loved the intro, too!
Thanks!! Appreciate that! The intro was fun to film lol
Thanks so much for taking the time to create this video. I have a 2005 Isuzu Ascender that is hesitating while accelerating. Trying to run down possible causes and this is one of them. Thanks for video.
No problem at all. Hope it fixes the issue
@@NexusAuto I replaced the MAP with an aftermarket one and it actually ran worse. I decided to try and clean the existing one with MAF cleaner and it definitely ran better. I also discovered I had a bad upstream O2 sensor. Replaced it and the vehicle is back in good running condition.
@@6rowlettes oh, that's interesting. Those aftermarket ones can be so hit or miss. But looks like between these 2 fixes, you're good to go. Awesome news!
Extremely helpful, thank you!
No problem at all!
Thank You for the help Great Video
No problem at all! Thanks for the great feedback
Thanks for the video
No problem at all. Thanks for watching
Very useful
That's great news
thank you!!
No problem at all!
thank you! this is a 10 minute job they can charge $100 plus bucks for savin' that money!
I'm with you there! Money saved is always a win!
👍🏻thanks
No problem
Thanks for the video really helped just out of curiosity what year is that trailblazer. 👍🏻
Awesome news, glad to hear the video helped out. This is a 2007 MY
Great video
Thanks, appreciate it!
Really helps!
Awesome news. Happy to hear
I will do that on my 20024x4 envoy
Awesome news! A heads up...some models actually came with a MAP (manifold absolute pressure) sensor and not a MAF sensor. So if yours looks different to this video, that would be why
I liked
Thanks, I appreciate it
👍
Thanks
What are the symptoms of a dirty mass air sensor ?
There is a few, but other things can cause these issues too. If you have a scanner, there is a code specifically for MAFs. That'll tell you for sure. But even if you don't have a code, you can see.
-rough rpm fluctuations, especially at idle
-hesitation when accelerating
-poor fuel economy and power delivery
-in extreme cases, the vehicle may even shut off at idle
-hard starts
-fuel smell (from engine running too rich, too much fuel going into the engine)
How long do you let the MAF sensor dry out before you put it back in?
Not long. A couple of mins is enough. MAF sensor cleaning dries up quickly
Hello I have faulty air flow sensor and it caused hard shifting when you disconnect the sensor car keep running think that what caused the harsh shifting
I can't say for sure that is the cause for your hard shift, but a faulty MAF *could* cause a hard shift situation. So it may be the cause
Awesome Viceo! But, I also have the 2004 Buick Rainier and it doesn't have one. Changed SP, Air Filter, coils are good. But it idles rough when in gear, smooth while driving. Help! LOL
Hmm. Did you try cleaning the throttle body or checking the MAP sensor (which is the sensor that was in place of the MAF sensor)?
2005 Trailblazer I6 4.2 Liter also does not have a MAF sensor. However, rockauto said it would fit my vechicle. IT'S going back.
I have a 2004 trailblazer 4.2 I6. Would mine have on?
I cleaned my throttle body with no change to the issues. It's eating gas really bad, stalling at stops, and misfiring.
Just for anyone asking or curious 02-05 doesnt have MAF sensor
Thank you for confirming! Funny enough, someone was JUST asking me about this and when i looked up some of my data and even some parts suppliers, they listed a MAF for 02-05 models. But I started to suspect this is not the case as I've seen a couple of people say they don't have one.
What made you Change out the MAF sensor ( Symptoms ) ? Was it throwing a Code , it is electrical ? Reason for the Question is I just changed the MAP sensor on my 05 envoy 4.2. it really ran rough to the point one day it wouldnt even stay running, code said MAP sensor. It did fix the Bog down and stays running , but on Stops etc. RPM wants to go High then back down etc. but no code. Im in Mn. so its a Bit Cold this year but i have not YET chased any Vacum leaks. but thought Id ask
I was getting no errors at all, and no codes. I made this video strictly to make the video for others to see. I didn't mind as I have never done it on this car, but there was nothing wrong operationally that led me to do this.
You may need to do a throttle relearn. Disconnect the battery for a few hours then reconnect. Keep in mind, you will lose your settings on the stereo and things like that. Sometimes installing a new MAP/MAF/Throttle body causes the car to run odd until the relearn is done, or after driving for a few hundred miles.
Ck our youre isle air control valve clean first if you can, think of it as the choke on carborated type engines
@@boarzwid1002 Absolutely. Doesn't hurt to check Idle Air Control Valve. IAC can be an issue too
maybe clean the throttle body w carb cleaner. I just did and it WAS running very rough.....now, idles at 650 rpm steady no ups and downs on the rpm
@@blueberrycornbread Absolutely. I agree there. Another potential cause.
Can I use that stuff to clean the map sensor
Yes you can, as long as you are careful about where you're spraying it. But it can be used for sure
Does the battery need to be disconnected?
Officially, the battery should always be disconnected when working on electronics. Just for personal safety and circuit device protection. That being said, I have done these with the battery connected and it has been fine, but I'm cautious. If you do the same, you are taking risks
Will it be better to just buy one .?
Depends. They can be fairly pricey, and I would say, from my experience, 8 times out of 10 a quick cleaning fixes any issues. But if it's in really bad condition or has a lot of build up, buying a new one is the better option
My 2003 trailblazer ext 4.2 doesn't have a MAF sensor. Am I missing something .
That's....weird. So there is nothing plugged into your air intake tube?
Thank you for responding. There is only the intake air temp sensor. I have watched videos others have made about cleaning their maf sensors, and where they show the sensors are, I have a flat spot on the intake tube.
@chesleyserge1757 ok, so I've been doing some research on this, as you got me really curious. I checked some of the guides and data I have, and it says MAF for 02-09. I also checked parts suppliers and they list MAF for 02-09. BUT...it looks like there is no MAF until 2006. Previous to that, these trucks used an Intake Air Temp and MAP sensors. So that explains why you don't have one. I'll have to update the description in this video.
Funny thing is, I came across some people with pre-05 for had a MAF. So I've wondered if either 1. GM had these in some models, and not others or 2. These are not first owners of their respective trucks and the engine was replaced at some point for a newer engine with a MAF and the current owner is unaware.
Either way, this was some interesting info. Thanks for asking the question! Hope this info helps you out too
What does it do??
When you put your foot down on the accelerator, it actually doesn't put gas into the engine. It opens a metal flap on the inside of the throttle body (which is after the air filter) and allows a bunch of air to enter the engine. The Mass Air Flow sensor measure that amount of air coming in, and tell the computer, and then the computer figures out how much gas to put in to match the air, so it can combust inside the engine and give you power.
If the sensor becomes dirty over time, it cannot properly tell the computer how much air is coming in. So you may get a loss of power, or poor fuel economy (or both).
Weird enough mine doesn't have that
Do you have the V8 model? If you have the inline 6, like this one, you definitely would. If you have the V8, there is on, but it is a whole housing, installed on the air duct hose, between the air filter and throttle body
@@NexusAuto I have an 04 trailblazer i6 😬 all it has is what I think is a temp sensor near the top part and that's it. I keep reading that they have some kind of manifold pressure sensor instead of an maf sensor
@@benjaminrivera117 Damn, you're right. I just pulled the spec and it looks like MAFs didn't come in until sometime mid 2005. I thought GM would have been using MAFs on these, since they had been using them for a while on other models. You do use a MAP sensor, which is on the other side of the engine. Learn something new every day. Thank you!
I gotta Question
Ask away. I'm not always on, so if I don't answer today, it may be tomorrow.
@@NexusAuto So I Have A GMC Envoy 02 It Works Turns On Etc But I Can't Accelerate Past 15 Mph 20 mph What Would You Think Is Wrong ? Someone Said could Be The Engine Or Fuel Injectors Or Something Else I Forgot I'm Changing The Fuse On It Today Bc I can't Even Get A Reading On What's Wrong With It
@@jaydadon4874 Hmmm. that's an interesting one. There could be so many causes. First, you need to determine if it's engine or transmission. When you are accelerating, does the engine RPMs go up? So the engine is revving but not going anywhere? How about when in park or neutral? Does the engine rev freely, or does it hesitate to past a certain RPM?
@@NexusAuto It Revs Rpm Goes Up You can Press The Gas All The Way Down But Mph Won't Go Up Past 25 30mph It Only Gives Gas To 20 when You Press Gas Lightly
@@NexusAuto Battery Dies To After Awhile If I Don't crank It
Do this job get off the checking light off
It can, depending if a dirty MAF is the cause of your light. It's worth a try. But after cleaning, you'll either need to clear the code with a scanner or go for a drive for a while and the car will sometimes clear the code itself if it no longer detects a fault