1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

won't start in cold - temp. sensor???

Discussion in '1st Gen. Tacomas (1995-2004)' started by metz2112, Jan 14, 2010.

  1. Jan 14, 2010 at 4:17 PM
    #1
    metz2112

    metz2112 [OP] Member

    Joined:
    Jul 7, 2009
    Member:
    #19394
    Messages:
    24
    Gender:
    Male
    My Tacoma hasn't been starting when it is cold outside.
    It has a full tank of gas and I put that additive called "HEET" in the gas tank so the lines wouldn't freeze.

    I'd like to get it so that it can reliably start in the cold.
    Today it was about 40 deg F and it started right up, but if the temperature is below freezing it will just crank and crank and never start.

    At first I thought it was an electrical problem because I recently had the distributor replaced, but now that it started on the first warmer day I am confused.:confused:

    Back in the summer, the car would have problems starting if it was really hot -- but if I unplugged the temperature sensor (in the air filter housing) it would start right up, then I'd plug it back in and ride off.
    I tried unplugging the temp. sensor in the cold but it didn't make any difference and still wouldn't start.

    Could this just be a temperature sensor problem? Would that keep it from starting when it is cold?
    Also where can I find a temperature sensor because I tried to order one at the local parts store and they couldn't get one?
    How often do these break - (aka maybe I should just get one at a junkyard?). I am confused that maybe this isnt the issue because I thought a temp sensor only fine tuned the fuel/air mixture - and wouldn't be the cause for it not to start???
     
  2. Jan 14, 2010 at 4:20 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,855
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    The sensor you are referring to is the MAF. The air temperature sensor is integrated into the MAF. Its an expensive part and fragile. The actual temperature sensor is in the block (depending on the motor you have).
     
  3. Jan 14, 2010 at 4:26 PM
    #3
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,855
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    What motor do you have?
     
  4. Jan 14, 2010 at 4:36 PM
    #4
    metz2112

    metz2112 [OP] Member

    Joined:
    Jul 7, 2009
    Member:
    #19394
    Messages:
    24
    Gender:
    Male
    no, my MAF is definitely a different part.
    Either that or I am not describing it correctly.

    There is a small sensor where the air filter is (I unplugged something this summer to get it working!).
    It is a 1996 4cyl Tacoma Xtracab.

    I thought it was an air temperature sensor.

    http://www.partsgeek.com/assets/rep/thumb/8216-01037056-1025642.jpg

    there is an image, it sits inside where the air filter is.

    Anyways, does anyone have any idea if that would be the cause of a no start if temps are below freezing?
     
  5. Jan 14, 2010 at 4:39 PM
    #5
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,855
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    Ah, that's the Air Charge Temperature sensor.
     
  6. Jan 14, 2010 at 4:43 PM
    #6
    metz2112

    metz2112 [OP] Member

    Joined:
    Jul 7, 2009
    Member:
    #19394
    Messages:
    24
    Gender:
    Male
    I knew I was missing something!! (I think I saw it referred to IAC sensor, and I couldn't figure out what it meant).

    so how important is this thing for actually getting a car started?? - or is it much more likely that some other electrical pieces are upset with the cold.

    I thought maybe the igniter could be what is picky in the cold (and maybe that is what caused the recent failure of the coil inside the distributor?). I could be completely wrong (and I hope I am, that part costs a lot of $$).

    The car doesn't have any codes (check engine light is not on ever).

    :confused::confused::confused:
     
  7. Jan 14, 2010 at 4:45 PM
    #7
    vball6pac

    vball6pac Well-Known Member

    Joined:
    Sep 4, 2009
    Member:
    #22252
    Messages:
    182
    Gender:
    Male
    First Name:
    Steven
    Arlington, VA
    Vehicle:
    white 09 4dr toyota tacoma 4x4
    side tube step bars, and a trd skid plate. Hood protector, and wade in-channel guards. K&N CAI, Dynomax catback exhaust. Weathertech floormats, and door scuff guards. White stubbie antenna.
    I bought mine in July in NC, and am in Indiana, and for some reason these people have some freakishly cold weather(less than 20 for 2 weeks), and she starts right up everytime.
     
  8. Jan 14, 2010 at 4:48 PM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,855
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    IAT = Intake Air Temperature sensor. Some time in 96 they changed the MAF design to incorporate the IAT. You must have one from before the change. You should be getting a code if it were bad.
     
  9. Jan 14, 2010 at 5:37 PM
    #9
    metz2112

    metz2112 [OP] Member

    Joined:
    Jul 7, 2009
    Member:
    #19394
    Messages:
    24
    Gender:
    Male
    but there is no code - and I know that unplugging that solved my problem in the summer (but not in the winter).

    What else could be causing a no-start condition only when the temp is below freezing?
    I don't think it is a fuel problem because I have a FULL tank of gas and I put HEET in the gas tank before filling it up.
     
  10. Jan 14, 2010 at 8:59 PM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,855
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    When you do get it running, it runs fine? No fluctuation in RPM, engine sputter?
     
  11. Jan 15, 2010 at 7:18 AM
    #11
    Idrivetoys

    Idrivetoys Well-Known Member

    Joined:
    Dec 8, 2009
    Member:
    #27253
    Messages:
    499
    Gender:
    Male
    First Name:
    Ryan
    Yuma AZ
    Vehicle:
    I need a 4 door DC 4x4
    my dads 2.4 had a sensor on a coolant line on the very back of the head, against the firewall, it was unplugged and only would start when warm, or with ether. plugged it up and it starts everytime now


    Ryan
     
  12. Jan 15, 2010 at 7:54 AM
    #12
    Janster

    Janster Old & Forgetful

    Joined:
    Mar 25, 2007
    Member:
    #1138
    Messages:
    14,256
    Gender:
    Female
    First Name:
    Jandy
    Lancaster, PA
    Vehicle:
    2016 GMC Canyon SLT w/ LineX and....
    Have you checked your battery? How old is it?
     
  13. Jan 15, 2010 at 12:00 PM
    #13
    metz2112

    metz2112 [OP] Member

    Joined:
    Jul 7, 2009
    Member:
    #19394
    Messages:
    24
    Gender:
    Male
    • When the car does start it idles smooth (RPM) and runs great!
    • I tried to start it with ether but it didn't start even with that sprayed in -- I will check by the coolant hoses near the firewall to see if anything is unplugged
    • The battery is fine - I had it tested in the summer (and I tried jumping it when it was cold as well)
    These are all great ideas, and I hope something I do will fix it. I feel like it is an electrical problem probably with a sensor and only when it is below freezing outside.

    ???:confused:
     
  14. Jan 15, 2010 at 12:14 PM
    #14
    Janster

    Janster Old & Forgetful

    Joined:
    Mar 25, 2007
    Member:
    #1138
    Messages:
    14,256
    Gender:
    Female
    First Name:
    Jandy
    Lancaster, PA
    Vehicle:
    2016 GMC Canyon SLT w/ LineX and....
    Battery connections clean & tight?

    I know you said the battery was checked this summer...however...batteries don't like to sit. If the truck sat that long without being used - then the battery could be loosing charge. I'd definately have the battery checked again. Or hook it up to a charger and have it re-charged. Overall, it's a lot more stressful (on the battery) in the cold weather than it is in the warm weather.

    Our corvette....the thing is constantly drawing power from the battery even when it sits.... the battery dies just from sitting. My husband keeps a charger on it constantly until we drive again. The charger is a CTEK Multi US 3300.

    When we owned our Jeep...it sat in the garage all winter. About once a month (or more) we'd go out and start it and let it run for like 10 minutes just to help keep the Optima charged up.
     
  15. Jan 15, 2010 at 7:05 PM
    #15
    metz2112

    metz2112 [OP] Member

    Joined:
    Jul 7, 2009
    Member:
    #19394
    Messages:
    24
    Gender:
    Male
    the battery is fine. I even tried taking it inside to warm it up.
    It started right up when the weather was warm yesterday.
     
  16. Jan 15, 2010 at 8:56 PM
    #16
    Idrivetoys

    Idrivetoys Well-Known Member

    Joined:
    Dec 8, 2009
    Member:
    #27253
    Messages:
    499
    Gender:
    Male
    First Name:
    Ryan
    Yuma AZ
    Vehicle:
    I need a 4 door DC 4x4
    have it scanned again at advance or autozone for any codes just to be safe, its free there
     
To Top