Mass Airflow Sensor cleaning? - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 12-31-2009, 07:06 PM
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Mass Airflow Sensor cleaning?

So the idol problem with my truck was the MAF I took it in to a close friends shop and he said when he stuck in the needle or something that it idol'd smooth and needed a new one. Picked one up from the junk yard for $70 and now was wondering how to clean these things. Here it is. What do I do to clean a MAF out? Details help a lot, I have never worked with these. Thank you!

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#2 Old 12-31-2009, 07:53 PM
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New Problem - MAF replaced - car dies

Okay so I just replace the MAF i cleaned it out, and now after running for about 10-15 seconds it dies. Ideas?
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#3 Old 12-31-2009, 08:14 PM
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It started to run now fine, when I tried to give it gas it wouldent, it would rev a little then just nothing then a little more then cut off. Very sporadic. Could this be a bad MAF, I got it from a salvage yard.
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#4 Old 12-31-2009, 10:11 PM
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Is that a MAF or a VAM? If it's the 3.0 it's not a MAF, not sure what the 22RE uses? If it's a VAM it has a door that moves via the air flow. A MAF will have a wire that you can see if you look into it. You don't need to clean a VAM unless the door is getting gummed up, A MAF can be cleaned with MAF cleaner from the auto parts store.



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#5 Old 01-01-2010, 12:19 AM
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Put your old air flow meter back on the truck. The one you bought may be worse than the one you had.
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#6 Old 01-01-2010, 03:11 AM
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Its a 22re, so MAF I am pretty sure. It has a little wire about a centimeter down with a plastic piece around it. You think it could be just a worse part?
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#7 Old 01-01-2010, 11:41 AM
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OK then that's a MAF. get some mass air flow sensor cleaner from the parts store. I know that autozone sells it. spray it directly on the wire to clean off any debris. don't touch the wire with anything though as it may break. I'm not sure if there is a way to test a MAF or not? I would think that should be able to though. Maybe the FSM could help you. If you google 93 toyota FSM it should come up.



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#8 Old 01-01-2010, 12:05 PM
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WARNING: I'm not a professional tech - use any advice at your own risk. Working on vehicles is risky: you can kill or maim yourself or damage your truck if you don't know what you are doing. It's your responsibility to get qualified help if you lack auto repair training/experience.
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#9 Old 01-01-2010, 12:56 PM
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I see that you can test them with an ohm meter so I will go out and do that. However I am just curious why would it be doing the thing where I pull the throttle and it revs but stops and cuts out then will hickup go back down and continue to rev up, all while I am pulling the throttle at a constant rate.
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#10 Old 01-02-2010, 11:13 PM
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x2


Our trucks DO NOT HAVE A MASS AIRFLOW SENSOR!

we have a vane airflow meter (VAFM)

The test you friend did does not tell you whether or not the VAFM is bad. By opening the meter a bit he richened up the mixture. if this smooths it out then you were running lean at idle. Now you need to figure out why it is running lean at idle. look for air leaks in the intake tract and vaccum leaks.

Don't talk about it, Just do it!

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#11 Old 01-05-2010, 01:19 AM
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Genius! Thanks Vicoor that made a lot of sense, and I found the problem. There was a crack however after looking over the thing I or my buddy never found it. It was on the back of the intake hose, plastic part about mid way where there is a notch where the brake booster? the other line that runs to the air intake also sits. There was a crack in the notch that line sits in, hardest darn thing to find but found it....which made the mixture run lean, un-equated air that the vafm never saw coming, creating my idle problem.

But hey I cleaned the throttle body and did much more work in the mean time, so I guess this pain problem was a plus!

Thanks again!
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#12 Old 01-05-2010, 10:48 PM
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That's what I thought but he said it had a wire inside of it.



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#13 Old 08-18-2013, 10:14 AM
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I have a 1993 pickup 22re I just replaced my maf thing with one from local parts store because I took the two screws out where you plug it up and it fell apart cost me abought 200.00 .I have new fuel filter,plugs,wires cap dist,button and anything else you can think of.None of that comes close to The added preformnce I got with the maf best 200.00 ive ever spent It runs like the day I bought it new 165000mi
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#14 Old 08-18-2013, 10:50 AM
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The VAFM (not MAF) is the primary load sensor for the engine management.

And being so makes it one of the components that can have the greatest effect on performance/driveability.

Generally these are very reliable, but now that most of our trucks are 20 years old or older, you can expect them to have some issues.

A dragging metering plate or out of range resistance trace can have a huge impact, and cause poor performance.

Because these issues "crept up" over time you may not have even noticed.

But once you replace a failing VAFM it becomes crystal clear just how the old one was affecting performance.

Buying a reconditioned VAFM is a good idea. While plenty are available for cheap in scrapyards all over the world, being electro-mechanical devices that are twenty years old, you can't expect them to work as well as they could.

It looks like you have found this out, so enjoy your new found driveability!
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#15 Old 08-19-2013, 08:20 AM
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Quote:
Originally Posted by rrussell14 View Post
I have a 1993 pickup 22re I just replaced my maf thing with one from local parts store because I took the two screws out where you plug it up and it fell apart cost me abought 200.00 .I have new fuel filter,plugs,wires cap dist,button and anything else you can think of.None of that comes close to The added preformnce I got with the maf best 200.00 ive ever spent It runs like the day I bought it new 165000mi
Did you finally figure out how to unplug it rather than remove the socket? that's kinda important.

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