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Old 05-11-2012, 09:58 AM   #1
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looking for back yard mechanic to work on 2001 corolla P0171 lean on bank 1

I am not sure where to start

well I start cleanning the maf sensor using brake cleaner. but no effect. in fact the maf sensor looks pretty clean.


these were done on the last maintenance
310 k - 312 k , the car has 314000 kms at the moment
oil
coolant
thermostat
water pump
plugs
air filter



All I got from reading the google
look for vacuum leak
o2 sensor may be dying?


any backyard mechanic in burnaby new west area looking for work??
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Old 05-14-2012, 12:29 PM   #2
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Replace the maf sensor.
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Old 05-14-2012, 07:22 PM   #3
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i agree... and this is coming from two toyota professionals...
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Old 05-23-2012, 07:28 PM   #4
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Check all your vacuum lines for leaks, try to spray some intake medic around your intake manifold and see if it makes a difference. If your scanner lets you see the short term and long term fuel mixtures check those out, should be between -10% to about +10%, max -15% to +15%. If those are good and within spec then it is your maf that is causing the issue. If they are not within spec it means you have a intake leak or too much fuel, most likely a intake leak. if it says +10 or +15% etc, it means it is trying to add fuel to compensate for the unmetered air after the mass airflow sensor hence a intake leak.
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Old 06-03-2012, 10:18 PM   #5
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yee replace that maf sensor i worked on a 03 corolla and if u hook up the scanner n read the maf the readings will be off but it isnt enough to trigger a check engine light
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Old 06-04-2012, 12:22 PM   #6
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my obd reader is Scangauge 2 so I can't check the fuel mixture.

I wonder if anyone here will let me borrow their MAF sensor to see if the problem go away? I know the code comes back 10-30 mins after I clear it

I don't want to spend $200 on maf sensor and finds out it vacumm leak or other sensor?
what do you guys think ?
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Old 06-04-2012, 02:52 PM   #7
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MAF sensor.
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Old 06-05-2012, 12:34 AM   #8
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if u dont want to replace the sensor take it to a shop n hav them diagnose it and then u hav a for sure answer
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