Why no writeup for cleaning MAF sensor?
09-30-2003, 05:38 AM
#1
Contributing Member
Thread Starter
Why no writeup for cleaning MAF sensor?
Anyone want to do one?
Seems like this has been a pretty persistant problem on most 3rd gen 4runners so maybe we should have a section for that in maintenance. Seems pretty improtant for keeping the old rig in tip top condition.....and besides, everyone who has done it reports great improvements in throttle response.
I haven't done mine, so I went to the tech writeup section.
I thought for sure there would be one but found nothing.
I know it is easy for those who have done it but it can be daunting for those who haven't.
Found some threads about it but not a single pic for a 96-98.
Seem like a good idea?
Seems like this has been a pretty persistant problem on most 3rd gen 4runners so maybe we should have a section for that in maintenance. Seems pretty improtant for keeping the old rig in tip top condition.....and besides, everyone who has done it reports great improvements in throttle response.
I haven't done mine, so I went to the tech writeup section.
I thought for sure there would be one but found nothing.
I know it is easy for those who have done it but it can be daunting for those who haven't.
Found some threads about it but not a single pic for a 96-98.
Seem like a good idea?
09-30-2003, 05:47 AM
#2
Senior Member
Join Date: May 2002
Location: Binghamton, NY
Posts: 2,752
Likes: 0
Received 0 Likes
on
0 Posts
FWIW...
I checked out my MAF when I cleaned out my throttle body. On my 96, it's just a very thin, delicate sensor that doesn't have much protection. I know how expensive these suckers are... so I ain't touching it. I cleaned the TB, but didn't do anything with the MAF. From the writeups I've read, on newer rigs they are easier to clean.
Here's my writeup on cleaning the TB... it's got some MAF pics in it.
I checked out my MAF when I cleaned out my throttle body. On my 96, it's just a very thin, delicate sensor that doesn't have much protection. I know how expensive these suckers are... so I ain't touching it. I cleaned the TB, but didn't do anything with the MAF. From the writeups I've read, on newer rigs they are easier to clean.
Here's my writeup on cleaning the TB... it's got some MAF pics in it.
Last edited by jacksonpt; 09-30-2003 at 05:49 AM.
09-30-2003, 06:01 AM
#3
Contributing Member
Thread Starter
I think it is a very fine piece of wire, right?
You should be able to hit it with some kind of electrical contact cleaner without doing any damage. I am curious if anyone has done it on these vehicles and what was the best way to do it. Seems like a writeup would really help in this case (ie a don't clean 96-98 but do clean 99-02 and here's how you do it, type of thing) Can someone chime in if you have cleaned your MAF sensor on a 96-98 with a 3.4L
You should be able to hit it with some kind of electrical contact cleaner without doing any damage. I am curious if anyone has done it on these vehicles and what was the best way to do it. Seems like a writeup would really help in this case (ie a don't clean 96-98 but do clean 99-02 and here's how you do it, type of thing) Can someone chime in if you have cleaned your MAF sensor on a 96-98 with a 3.4L
09-30-2003, 11:02 AM
#4
Registered User
Join Date: Sep 2003
Location: Albuquerque, NM
Posts: 380
Likes: 0
Received 0 Likes
on
0 Posts
Its really quite simple...
a. remove maf
b. clean
c. reinstall maf
Please feel free to copy this to the tech section:
99 4Runner 3.4 instructions for getting rid of P0171 and P0172 ECU codes:
The MAF/IAT module is located just downstream of the air filter. Two phillips screws hold the module in place. You may need to move the cruise control servo box to get at the MAF/IAT.
Once removed, clean by spraying contact cleaner on the IAT sensor (obvious little bulb thingy) and down into the MAF airflow tube. Looking into the downstream side of the MAF tube, you can see two wires which make up the hotwire MAF. The contact cleaner I used has silicone lube as part of the mix, so to get rid of that, just swish it around in dish soap and warm water, or use a toothbrush to get the gunk off. Don't be afraid of getting it wet, they are sealed.
Let dry throughly. You can gently blow dry.
Reinstall and watch the Check Engine light go off after 3 or 4 trips. Also notice that the momentary lag at 3200~3400 RPM is significantly reduced.
The MAF/IAT module will stay cleaner longer by using a quality air filter.
a. remove maf
b. clean
c. reinstall maf
Please feel free to copy this to the tech section:
99 4Runner 3.4 instructions for getting rid of P0171 and P0172 ECU codes:
The MAF/IAT module is located just downstream of the air filter. Two phillips screws hold the module in place. You may need to move the cruise control servo box to get at the MAF/IAT.
Once removed, clean by spraying contact cleaner on the IAT sensor (obvious little bulb thingy) and down into the MAF airflow tube. Looking into the downstream side of the MAF tube, you can see two wires which make up the hotwire MAF. The contact cleaner I used has silicone lube as part of the mix, so to get rid of that, just swish it around in dish soap and warm water, or use a toothbrush to get the gunk off. Don't be afraid of getting it wet, they are sealed.
Let dry throughly. You can gently blow dry.
Reinstall and watch the Check Engine light go off after 3 or 4 trips. Also notice that the momentary lag at 3200~3400 RPM is significantly reduced.
The MAF/IAT module will stay cleaner longer by using a quality air filter.
09-30-2003, 02:31 PM
#5
Contributing Member
Thread Starter
That's great Unhappy99!
Any pics you can post for us too?
I would assume the 96-98 procedures are a bit different cause they use a different MAF.
Anyone done it on one that looks like this?
If so are the procedures the same?:
Sorry Jackson, I borrowed your pic.
Any pics you can post for us too?
I would assume the 96-98 procedures are a bit different cause they use a different MAF.
Anyone done it on one that looks like this?
If so are the procedures the same?:
Sorry Jackson, I borrowed your pic.
Last edited by MTL_4runner; 10-01-2003 at 02:59 AM.
Trending Topics
09-30-2003, 09:14 PM
#11
Registered User
Join Date: Sep 2003
Location: AZ
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
What about the 3VZ-Es? I took mine out last week and there is just a "door" in the air passage. In the intake side, there is a little, yellow, plastic knob about 3/16" wide, 3/8" long that sticks down, too. Uncleanable MAF sensor on these engines?
09-30-2003, 09:32 PM
#12
Registered User
Join Date: Sep 2003
Location: Albuquerque, NM
Posts: 380
Likes: 0
Received 0 Likes
on
0 Posts
If I understand you correctly, your MAF is a big spring-loaded butterfly valve (or door as you describe)? I had this on an 87 22-RE.
In this case, no, there is no cleaning of the MAF sensor. Vane type sensors do not need cleaning, only hotwire types do.
In this case, no, there is no cleaning of the MAF sensor. Vane type sensors do not need cleaning, only hotwire types do.
10-01-2003, 02:53 AM
#13
Contributing Member
Thread Starter
Thanks for posting those pics....this should help those with the 99 - 02 type!
Here they are so you don't need to view the attachments:
Location of your MAF sensor:
Removal of the sensor:
Sensor out:
Sensor parts:
Hotwire location:
Can someone post similar for the 96 - 98 type if they have them?
Here they are so you don't need to view the attachments:
Location of your MAF sensor:
Removal of the sensor:
Sensor out:
Sensor parts:
Hotwire location:
Can someone post similar for the 96 - 98 type if they have them?
Last edited by MTL_4runner; 10-01-2003 at 02:58 AM.
10-01-2003, 04:44 AM
#14
Guest
Join Date: Jun 2003
Posts: 5,055
Likes: 0
Received 0 Likes
on
0 Posts
Mine is hanging out upside down for the time being without the box. After doing my body lift the factory air tube would not mount properly. I had to mount everything without bolting it down. I had to ditch the air box, rotate the MAG assembly over set the air cleaner on it and strap it down. Seems to work just the same. I am going to do Dr. Z's air tube mod asap though.
12-10-2003, 01:46 PM
#16
Contributing Member
Join Date: Sep 2002
Location: Urbandale, IA
Posts: 7,112
Likes: 0
Received 0 Likes
on
0 Posts
Just FYI guys, I don't think its as easy as just copying to the tech section.
Corey is the guy that uploads that stuff, and I believe he needs things to be in a certain format before submitting a write-up to him.
Here's the guidelines. If you have time it would be nice if you could get them in this format so we could then add them!
Corey is the guy that uploads that stuff, and I believe he needs things to be in a certain format before submitting a write-up to him.
Here's the guidelines. If you have time it would be nice if you could get them in this format so we could then add them!
I hope it wasn't built by them. Nah.............it can't be...........its not broke yet.
12-10-2003, 02:51 PM
#18
Contributing Member
Thread Starter
I remember someone else makes the tranny.....was it GM, Ford or Chrysler?
Anyone know the answer?
I would love to do a writeup for the MAF but I don't have time right now.
I might try to do one on an alarm install over X-Mas though.
Anyone know the answer?
I would love to do a writeup for the MAF but I don't have time right now.
I might try to do one on an alarm install over X-Mas though.
12-10-2003, 02:54 PM
#19
Contributing Member
Thread Starter
Originally posted by j-dub
Are you guys cleaning it with Isoporyl(sp?) alcochol or electrical parts cleaner?
Are you guys cleaning it with Isoporyl(sp?) alcochol or electrical parts cleaner?
