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Old 06-29-2015, 11:48 AM #1
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Talking MAF sensor cleaning **Testimonial**

Recently, as some of you may have read, I've been having some issues with my 3rd Gen - MPGs low, Rough Start, Idle RPMs not consistent, Engine dying after WOT (wide open throttle)

So I started trouble-shooting and doing the basic stuff I saw that may help, did an all around seafoam treatment, gas tank, crank case, and seafoamed directly into the throttle body. Immediately it drove better, lower RPMs at idle, and gas mileage seemed to go up a bit.

So brought it to my local Toyota guy, he did an oil change, cleaned the throttle body again, (got more stuff out than I could) and tested my electrical components and all came back clear, after I picked it up, it drove even better. Smoothest it has felt since I bought it last year.

But, it still wasn't starting smoothly and the idle was rough with inconsistent RPMs. Nothing drastic but not as smooth as it should be.

I knew I had one thing left to do. Clean the MAF sensor. So I bought a can of MAF sensor cleaner, grabbed the socket set and grabbed that sucker out of my truck. I have a 98, so it has the old style sensors that you can barely see, so I shined the light down the hole and lo and behold, I had some pretty dirty sensors, they werent completely black, but I did know from other pictures they should be a shiny metallic silver. So for a bout 15 minutes I sprayed the cleaner on the 2 little sensors, let it sit for a second to work it's magic, then with canned Air I would spray it and dry it. I repeated about 15 times, until it looked brand-new.

I reinstalled the air box and sensors, went around to the drivers seat and started it up, and BOOM. The best sounding start of the 4Runner I had ever heard. Sounded strong and confident. Not like the sneeze of a dying cat. I couldnt resist, I had to take it for a drive, and holy crap, It was like a totally different vehicle. Big power gain and the engine felt super strong. I cant speak for the MPG's yet because I havent driven it too much but I will update on those as soon as I can, I've been getting about 16-18 mixed driving with the dirty sensor. So Im excited to see how it is clean.

I know I wrote a book, but I just wanted to tell of my experience, it is ABSOLUTELY worth the $7.85 for the cleaner and the 30 minutes to pop out the sensor and reinstall !!
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Old 06-29-2015, 11:53 AM #2
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well grats! i hope this was all the truck needed.
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Old 06-29-2015, 11:56 AM #3
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well grats! i hope this was all the truck needed.
Thank you! Same here. Next weekend I will be replacing the sparks and wires, hopefully it will just be getting better and better. I just hope someone can see this and the things I've dealt with as a way to help them and solve similar problems!
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Old 06-29-2015, 12:37 PM #4
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Just saw your post here, hopefully that'll fix your issue! That reminds me... my MPG's are dropping so it might be time for me to clean mine again too.

I know how you feel though, I've taken my 4Runner from a sloppy, slow (it was supercharged but you couldn't tell), average SUV to a solid rig that really gets on it. It's kinda fun!
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Old 06-29-2015, 12:55 PM #5
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Quote:
Originally Posted by gamefreakgc View Post
Just saw your post here, hopefully that'll fix your issue! That reminds me... my MPG's are dropping so it might be time for me to clean mine again too.

I know how you feel though, I've taken my 4Runner from a sloppy, slow (it was supercharged but you couldn't tell), average SUV to a solid rig that really gets on it. It's kinda fun!
It feels good being hands on and actually making improvements myself to my vehicle, definitely more fun than just throwing it at a shop and letting them do everything and having all the fun!
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Old 06-29-2015, 12:59 PM #6
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Im in the same situation and have been gathering parts so I can do a DIY day to install and do all these at the same time in hopes to get the same outcome as you. So far I have the following: NGK spark plugs, NGK spark plug wires, throttle body cleaner, MAF cleaner, ISR mod parts, K&N panel filter, and deck plate mod parts. I will also be ordering PCV valve as well as an OEM fuel filter. Hopefully ill have similar results or better.

Did the toyota tech physically clean the throttle body or did they just spray it clean?
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Old 06-29-2015, 01:08 PM #7
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Quote:
Originally Posted by SoSoJeff View Post
Im in the same situation and have been gathering parts so I can do a DIY day to install and do all these at the same time in hopes to get the same outcome as you. So far I have the following: NGK spark plugs, NGK spark plug wires, throttle body cleaner, MAF cleaner, ISR mod parts, K&N panel filter, and deck plate mod parts. I will also be ordering PCV valve as well as an OEM fuel filter. Hopefully ill have similar results or better.

Did the toyota tech physically clean the throttle body or did they just spray it clean?
Both work but if you overspray the throttle body when it's on the vehicle, all that gunk goes through the hole in the bottom and will mess up the IAC valve located in it. I'd go for the shop towel and only use cleaner sparingly to loosen up any gunk, or you'll then have to clean the IAC too.
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Old 06-29-2015, 03:58 PM #8
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Quote:
Originally Posted by SoSoJeff View Post
Im in the same situation and have been gathering parts so I can do a DIY day to install and do all these at the same time in hopes to get the same outcome as you. So far I have the following: NGK spark plugs, NGK spark plug wires, throttle body cleaner, MAF cleaner, ISR mod parts, K&N panel filter, and deck plate mod parts. I will also be ordering PCV valve as well as an OEM fuel filter. Hopefully ill have similar results or better.

Did the toyota tech physically clean the throttle body or did they just spray it clean?
He actually scrubbed the gunk out of the Throttle Body..the night before I did a spray cleaning with seafoam just to loosen it up so his cleaning would be more effective.
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Old 06-29-2015, 04:31 PM #9
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Quote:
Originally Posted by gamefreakgc View Post
Both work but if you overspray the throttle body when it's on the vehicle, all that gunk goes through the hole in the bottom and will mess up the IAC valve located in it. I'd go for the shop towel and only use cleaner sparingly to loosen up any gunk, or you'll then have to clean the IAC too.
uh oh.........
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Old 06-29-2015, 04:44 PM #10
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uh oh.........
Haha don't fret just yet. As long as it idles ok you're fine.
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