Question about Toyota 4Runner

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Changed the maf and now my 4runner runs differant

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The computer has to learn the new sensor this could take 100 miles or so.

Posted on Apr 20, 2014


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I changed the knock sensor and pig tail on my 95 toyata 4runner awhile back. Ran better down the high way but had a really rough idle. So I changed the maf sensor now it won't idle at all.

You more than likely have a bad maf sensor ,take it back and exchange it for another one,or a different brand,maybe NAPA auto parts.

Oct 05, 2013 | 1995 Toyota 4Runner

1 Answer

1994 Toyota 4runner runs intermittently, no vacuum sounds as if there is a leak, all fluids topped off, truck cranks over and does start but will not stay running. Idle changes drastically until hot. Once...

You should check you MAF sensor. clean your throttle body and change your spark plugs. shouldn't be anything if you say there is NO vacuum leak.would recommend searching your PCV valve for a vacuum leak

Feb 07, 2013 | Cars & Trucks

1 Answer

1991 4runner starts fine run about 5-8miles come to a stop and the rpm drops to about 500-650,go to accelerate and it will stall,then it takes 10 to 20 attemps to restart it.replaced o2 sensor 8 vacuum...

Check your fuel filter,, then have your fuel pressure tested,
It may even be possible to have a week fuel pump or a restricked fuel filter sock,

also,, this is a "reach" but, make sure your gass cap is tight and sealing ok....
Hope this helps! Good Luck!

Sep 13, 2011 | 1991 Toyota 4Runner

1 Answer

Where is the MAF sensor on a 1998 toyota 4runner with a 3.4 liter engine

Hello. Welcome to FIxYa. Please allow us to assist you.

The MAF (on any Toyota) is located in the tube between the air filter box and the intake manifold/throttle body on the engine. It is a black device with a wire connector, and is held on by two screws.

Thanks for choosing FixYa for assistance.

Mar 06, 2011 | 1998 Toyota 4Runner

1 Answer

200 4runner, V6 auto. Dead spot in the throttle and codes for lean on both banks. Cleaned the mass airflow and changed the fuel filter. Engine runs better at start up, but throttle dead spot is worse.

Make sure the MAF sensor is working properly. If ok, Check all intake hoses for cracks or leaks as this will cause lean codes. Other issues that may cause this is faulty cam sensor or if timing is off!!

Oct 20, 2010 | 2000 Toyota 4Runner

2 Answers

My 4runner is getting bad gas mileage and won't pull a rolling hill without revving up to 4k. Normally it will hold 70-75 up a rolling hill around 3k. It even felt like it was backing down a knoctch and...

It could be a number of things. My recommendations are as follows:
-bad gas (run some bottles of lucas and injector cleaner thru)
-change air filter
-change fuel filter
-clean MAF sensor with MAF sensor cleaner ONLY
-check MAF sensor voltage readings as per service manual
-Re-calibrate throttle position sensor. They tend to need this around 120-150k miles
-check vacuum level
-check cylinder compression
-Depending on mileage and if there are any codes, replace O2 sensors with Denso only sensors
-Not likely, but the cat could be restricted too

My '01 was doing the exact same thing, and it turned out to be the MAF was dirty- and the fix took about 2minutes and ran me ~$5 for a can of MAF cleaner.

Hope this helps,

Mar 01, 2010 | 2001 Toyota 4Runner

1 Answer

98 4 runner MAF problem. Was replaced 1 year ago with after market MAF. Check engine light would come on every 3 months. They would clean it and clear code. Now it only lasts 2 weeks. Took it to Toyota -...

Make sure that there are no leaks, on your duct hose..where the MAF is located..because if you are getting too much air..the MAF, will try to adjust to it, and it will throw your injectors out of wack, and then you will have a code...stating that you are running too rich, or lean, and then your plugs will foul out, because of too much gas, or not enough...and then it will trickle down to your O2's a big chain reaction when it comes down to the MAF sensor...but check your Duct....

Dec 02, 2009 | 1998 Toyota 4Runner

4 Answers

1999 Toyota 4Runner - Code 0171

Code P0171 Means that an oxygen sensor in bank 1 detected a lean condition

All this means is that one or more of the following happened Your MAF (Mass Air Flow) Sensor is dirty or faulty. The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor. In most cases, simply cleaning the MAF sensor does the trick. Take it off and spray it with some electronics cleaner or brake cleaner. Make sure you are careful not to damage the sensor, and make sure it's dry before reinstalling. Inspect all vacuum and PCV hoses if damaged replace. Check for a dirty fuel filter and proper fuel pressure. Hope this gets you going, Please Rate Me. And you can always Ask Me.wutxtye0rjd9d9ekmodqt1eoxkvn9hr9qjz1l3dabggyud7sdgr36czsrfxqenadhnijx9nfayi+sz1sug0aaaaasuvork5cyii=

Apr 26, 2009 | 1996 Jeep Grand Cherokee

1 Answer

I have a 4runner and i would just want to know the wire color of the iat sensor...their are 7 wires on the maf sensor and i do,t know which are the wires for the iaty sensor

It should be a yellow wire with a black stripe, it is called the THA terminal and is on pin number 7 at the MAF. You can use pin 5 (brown wire with black stripe) as the return when making resistance measurements on the MAF (disconnect first)

Feb 27, 2009 | 1990 Toyota 4Runner

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