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TRD Cold Air Intake/Mass Air Flow Sensor/Check Engine Light Question

Discussion in '2nd Gen. Tacomas (2005-2015)' started by FrijolPower, Sep 17, 2012.

  1. Sep 17, 2012 at 3:17 PM
    #1
    FrijolPower

    FrijolPower [OP] Member

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    First of all, some background on my truck, I have a 2008 Double Cab with the TRD Off Road Package and the 4.0 V6. I have done a couple upgrades, the relevant ones are a TRD Catback (about 2 and a half years ago) and a TRD Cold Air Intake (about 2 years ago).

    About 4 months ago my "Check Engine" light turned on, I immediately took it to the dealer so they could run a diagnostic and tell me what was wrong with it.
    The code came back a problem with the Mass Air Flow Sensor. A new Mass Air Flow Sensor and $300 later I was on my way.

    About 2 months later my "Check Engine" light turned on again. Again that same day drove down to the dealer to have it checked out (and enjoy the warranty on their service), the diagnostic code was Mass Air Flow Sensor. Since they couldn't find anything else wrong with it they assumed it was defective, and swapped it out - for free this time.

    About a month and a half later, again, my "Check Engine" light turned on, so again, I reluctantly drive down to the same dealer, hopefully it was covered by their service warranty again. Again the diagnostic code came back as Mass Air Flow Sensor, but this time they say when I cleaned my TRD Cold Air Intake filter I must have used too much oil and it had blown on the sensor causing a short. In other words, they swapped out the Mass Air Flow Sensor for a quick $250 and instructed me to go home and reclean out the filter and use less oil this time. So I did.

    About 2 weeks later (can you guess what happens next?) my "Check Engine" light turns on... again, and again I drive down to the same dealer - I must be a glutton for misery. The diagnostic - Mass Air Flow Sensor. This time they keep my truck for 2 and a half days, ran every test and monitor they had available. They couldn't find anything wrong with the Mass Air Flow Sensor. They suspected something is wrong with my TRD Cold Air Intake, so for a test, they swapped it out with a stock and found that it "solved" the problem. So what they found was I was triggering a CODE P0101 - "MASS AIRFLOW CIRCUIT RANGE/PERFORMANCE PROBLEM." What they tell me, my TRD Cold Air Intake is messing with the air/fuel ratio. The normal Long Fuel Trim Percentages are 5.5 to 8.5, with my TRD Cold Air Intake I run at 19.5 to 22.5, which is still under the max allowed of 30, but there are instances when it spikes above 30, triggering the Code P101 and my "Check Engine" light.

    Their recommendation? Swap out my TRD Cold Air Intake for a stock, or buy a new TRD Cold Air Intake, or run it as is since they cleaned everything out really good and it might have "fixed" it.

    I am still not comfortable with what they are telling me. I have had my TRD Cold Air Intake for about 2 years and have never had a problem, so my question is has anybody else ran into similar issues, if so what did you do? Or if you haven't but have some insight on what is really going let me know.

    Thank you!

    M
     
  2. Jan 27, 2013 at 6:32 PM
    #2
    momsintruder

    momsintruder Member

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    yeah I'm having the same problem with my 3.4 I have caused from know and it keeps a code po 0171 lean code and I put my stock back on and it clears up but the gas mileage is so much better with the a cai I want to keep it but no answers for me either. if u find out let me know.
     
  3. Jan 27, 2013 at 8:15 PM
    #3
    BamaToy1997

    BamaToy1997 ASE Master Tech Vendor

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    First thing I will say, is that a long term fuel trim of +5.5 to +8.5 is STILL too high. You are showing to be running lean, even WITH their test. A MAF code can also be set because of unmetered air. Basically a vacuum leak. With a small LTFT of 5-8 it will be a small leak. That is what I am suggesting to look for first. After you get THAT part solved, I would look to see if the code returns, and go from there. Many CAI systems flow much better than factory air intakes, and this can cause the computer a bit of confusion because at "X" RPM, and "Y" engine load and "Z" air temperature, the computer expects to see a specific, preprogrammed airflow. IF the restriction in the air intake is lower than expected, it can set a MAF code.

    All of that aside, even a free-flowing intake system should not be running LTFT numbers in the 20s or 30s. I have run PLENTY of vehicles in my shop during diagnosis with unrestricted airflow, and none of them have EVER seen LTFT numbers like that. I think they are just looking at the code itself, and not looking at all the different problems that can set that code. A performance code is not a solid indicator that the sensor itself is bad. Personally I would never use a wet-CAI system. They are right that a wet-CAI system CAN cause premature failure of a MAF, as well as erroneous data, which CAN (Not always will) throw off FT numbers.
     
  4. Jan 27, 2013 at 8:19 PM
    #4
    650H1

    650H1 Well-Known Member

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  5. Mar 14, 2013 at 7:49 PM
    #5
    FrijolPower

    FrijolPower [OP] Member

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    Thanks for the help!
     
  6. Mar 21, 2013 at 6:36 PM
    #6
    toytaco1

    toytaco1 Well-Known Member

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    trd supercharger, TRD intake, magna flow exhaust, JBA headers, walker evans front, fox rear, leaf pack, drilled slotted rotors, All Pro Front Bumper, Warn 8000 Winch
    I had to drill holes on mine but def a fail on TRD's part
     
  7. Jul 30, 2014 at 12:53 AM
    #7
    TRDh4vok

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  8. Jul 30, 2014 at 5:05 AM
    #8
    D4D Hilux Dude

    D4D Hilux Dude Well-Known Member

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    I had the same problem, however I have the TRD supercharger installed.

    Toyota told me to keep the stock air filter as the CAI is not compatible with the S/C.

    I did not try cutting the intake as shown in the video though... not keen on cutting stuff up if its not guarenteed to work.
     
  9. Dec 6, 2014 at 6:06 PM
    #9
    Mevadus

    Mevadus Active Member

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    Has anyone confirmed that removing this portion of tubing will indeed prevent a check engine light? I installed my CAI today on my 2011 Tacoma, and already have a check engine light. I put a small scribe in each hole with the hose installed correctly, and nothing seemed to be blocking the holes internally. I thought that was the issue which would be resolved by cutting out that section of hose. Should I cut the hose anyways?
     
  10. Dec 14, 2015 at 1:11 PM
    #10
    TacoCynGsxr

    TacoCynGsxr Well-Known Member

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    2007 Taco SR5 V6, 6-Speed Manual, 4x4, Access Cab, Super White - Made in Fremont CA - NUMMI plant - 162k miles (I'm the original owner) Current Mods: -Pelfreybilt High Clearance Bumper w/ Swingout Tire Gate + RotoPax Mount + Cb Tab - installed Dec 2015 -Pelfreybilt IFS Skid Plate - installed Sept 2015 -Camburg Engineering (UCA) Upper Control Arms w/ 1.25" FK Uniballs - Installed July 2015 -SwayAway RaceRunners 2.5 Coilover Suspension - installed July 2015 -SwayAway RaceRunners 2.0 Rear Suspension - installed July 2015 -All Pro Offroad U-Bolt Flip Kit - installed July 2015 -Timbren BumpStops - installed July 2015 -ARB Old Man Emu Dakar Leaf Springs w/ Add a Leaf - installed July 2015 -ARB Diff Drop Kit -SnugTop Rebel Camper w/ Flip Down Window and Yakima Racks -TRD Cold Air Intake (removed TruFlow CAI) -CORE/Hurst Shifter Short Shifter - installed May 2015 -RedLineGoods shift boot custom (Poland) - installed August 2015, installation issues. Not a clean install. I wouldn't buy again. -HotRodShiftKnobs - Old Toyota Style Shift Knob -Oregon Racks Bed Corner Bracket - installed Sept 2015 (product is ok but wish they used t-slot nuts to make it easier to install) -BFGoodRich KO2s -265/75/R16 removed Falken Rocky Mountains - installed Sept 2015 -Toyota OEM Clutch - new installed Sept 2015 (2nd set) -URD USA / PDM Tranquil Sleeve - installed Sept 2015 (2nd set) -Coleman Racing SwayBar Links - Installed Sept 2015 -Toyota OEM Brakes - installed May 2015 (3rd set) -BirdDawg Industry Clear View Mirror Bracket - Installed Nov 2015 (product is ok but wobbly) -Custom 4 Wheel Drive Aluminum Emblem -Satoshi Grill - poorly made by TW member - installed June 2015 (Can't wait to remove) -Bullaculla relocate harness - installed on old bumper (removed) -WaterPort 4 Gallon Portable Water Tank w/ Bracket and Holder -RotoPax 2 Gallon Gas Pack w/ LOX -Crosby Shackles (2) for Rear HC bumper. -KB Voodoo Cargo Management Basket - installed March 2016 -Prinsu AccessRac Roof Rack + custom anodized side and front panels. Haven't installed yet. -Firestix 9' Safety Flag Whip -Firestix 2' CB Antenna + Stainless Steel Mount -Pelfreybilt Fuse Panel Mount -installed Feb 2016 -BAMF Behind the grill light bracket - installed June 2016 -Trasheroo - 1 Tan and 1 Black w/ Pelfreybilt logo. -Pelfreybilt HC Bumper Fold Down Table -have but not yet installed -Pelfreybilt HC Bumper Rear Camera Mount -have but not yet installed -IGGY Panel - have but not yet installed Problems/Maintenance to do: - Leaking Rack & Pinion - CV boots - Valve inspection - Gear Oil Smell due to Shift Boot - Front and Rear Diff Oil Change - Brake and PowerSteering Fluid Change Not Yet Installed but have on hand: - New FK uniballs from Camburg (have not installed) - Goodridge SS Brake Lines (have not installed) - Fomoto Quick Drain Oil Plugs (have not installed) - BAMF Cab Mount Chop Plates (2) (have not installed) Wish List: - Demello, Pelfrey or ARB front bumperw/ Warn Winch - 700 lb King Coils - Better Stereo System with large touch screen - Rear Camera custom - Spot GPS Tracker - DB Customz/TrailToys Grill - Heretic LED or Rigid 30" Lights for Prinsu rack - ARB Intensity Round Lights for BAMF Behind the grill - ARB Diff Breather Kit - ARB Air Lock Diff - ARB On Board Air and Tank - ARB Fridge 50qt + Slider + Cover + Wireless Temp Gauge - ArkPak Portable Battery w/ Overland Solar Panels or Goal Zero - Dual Battery Setup w/ Blue Sea Fuse Panel etc... - Fire Extinguisher + Holder - Total Chaos Spindle w/ Sway Gussets - KrazyBeaver Shovel - MaxTrax Treads - SCS Wheels - 33" or 35" tires - WARN Winch - Tepui RTT - Hella Superhorns - Pelican Cases - CB Radio
    This is just for reference if anyone runs into this with their 2nd gen TRD CAI. make sure this hole doesn't get accidentally covered. I saw videos online where they trimmed but no need to. Just make sure you don't cover this hole. upload_2015-12-14_13-11-10.jpg
     
  11. Jul 8, 2016 at 10:38 AM
    #11
    nolajefe

    nolajefe New Member

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    Mid Travel Total Chaos kit upper arm and Fox Coil-overs. Deavers in the rear with Fox shocks 456's for gearing 33x12.50R20ET open country toyo mt with BMF 20' Rims and a K&N intake.
    I am having the same problem with the TRD intake. I have ran the intake for about a year and never had a problem with a light coming on. I did have the head gasket come out of the truck last month. I am having the problems with light and running lean now. I am over it I am looking for a stock air box.

    IMG_0751.jpg
     
  12. Jul 8, 2016 at 10:52 AM
    #12
    eon_blue

    eon_blue got boost?

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    see the sig -->
    Check for vacuum leaks. The same code that gets set off for your MAF sensor can also be due to a leak somewhere or disconnected hose. Also possibly a bad air /fuel sensor or exhaust leak, though usually less likely
     
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