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Cleaned my MAF, screwed it up??

 
Old 03-14-19, 07:01 PM
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eicca
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Default Cleaned my MAF, screwed it up??

So I cleaned the MAF on our Land Cruiser (2UZ 4.7 V8) with the CRC spray stuff, and it felt waaaay better.

So then I cleaned the MAF on my GS400. It just felt wrong after that. Rough idle, occasional stumble, fuel trims reading high negative (rich), and I reset the computer several times but that didn't help. No codes or anything but it definitely felt sick.

I got a used OEM MAF from eBay for cheap and now it feels healthy again and fuel trims are again reading a vacuum leak (like they should because my PCV grommet is crap).

Thing is, I'm tempted to clean this MAF too, but I don't want to break it.

Are these GS400 MAFs prone to going bad when cleaned? The one on our Land Cruiser doesn't look like a little jet engine, like the GS one does. The internet tells me the GS4 doesn't use a Karman Vortex MAF, because it interchanges with a bunch of V6 engines from the same era and they don't seem to have problems...
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Old 03-14-19, 07:56 PM
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I have cleaned mine lots of times over the past ten years with CRC and have also tried carb cleaner.without having any issues. Maybe I just got lucky...

Also found out that the MAF for the GS4 is the same as the one in the late 90's v6 like in Camry, Sienna, avalon, etc. so you can pick them off at u-pull it yards for next to nothing.
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Old 03-14-19, 08:00 PM
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Yeah the one I got was from a Solara and it was $25 shipped. Thank goodness Toyota is sensible about interchangeable parts.

Do you just squirt the one wire you can see from the “nozzle?”
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Old 03-15-19, 02:36 AM
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Yes I usually liberally soak the wire and surrounding housing. Then I shake off access cleaner and let it dry.
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Old 03-15-19, 05:17 AM
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Which CRC product are you using, specifically?

Thx.
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Old 03-15-19, 06:11 AM
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Are you just spraying it, or touching it with a q-tip or anything? Spraying should be fine, but if you touch it with anything, it could cause problems. Maybe it was still wet when you turned the key on.. shorted it out.. not sure, but I wouldn't hesitate to spray clean the new one. Just be gentle with it and let it dry. I've spray cleaned mine before.
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Old 03-15-19, 06:33 AM
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Originally Posted by sbagdon View Post
Which CRC product are you using, specifically?

Thx.
CRC MAF cleaner.

To answer the other person, no q-tips or touching the wires. Just spray.
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Old 03-15-19, 03:49 PM
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Originally Posted by eicca View Post


CRC MAF cleaner.

To answer the other person, no q-tips or touching the wires. Just spray.
So hold it vertical, spray down, let it drip/dry, then let it stand dry?

Thx.
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Old 03-15-19, 05:30 PM
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Originally Posted by sbagdon View Post
So hold it vertical, spray down, let it drip/dry, then let it stand dry?

Thx.
Thats the idea. Worked wonders on the Land Cruiser, like I mentioned... Maybe my MAF was just on its way out and the cleaner pushed it over the edge.
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Old 03-17-19, 09:46 AM
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That CRC stuff will damage certain style air flow meters from Supra's from the late 80's to early 90's and some Lexus models in the early 90's used that style sensor as well. That air flow meter style I am talking abut looks like this one:

https://www.ebay.com/itm/22204-42011...4AAOSwnh9b3-MD


I have used that stuff on my 04 GS300 and I had no problems with it.
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Old 03-17-19, 10:16 AM
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Originally Posted by shwalker07 View Post
That CRC stuff will damage certain style air flow meters from Supra's from the late 80's to early 90's and some Lexus models in the early 90's used that style sensor as well. That air flow meter style I am talking abut looks like this one:

https://www.ebay.com/itm/22204-42011...4AAOSwnh9b3-MD


I have used that stuff on my 04 GS300 and I had no problems with it.
Yes, that’s the Karman Vortex contraption that gets wrecked by spray cleaners.

I still havent cleaned my “new” Solara MAF but the car is running much better. Smoother idle, better torque curve, and almost no more wonky behavior from the transmission on cold starts.
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