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Random loss of power, shifting, and acceleration

Discussion in '1st Gen. Tacomas (1995-2004)' started by TacoStateOfMind, Jan 31, 2011.

  1. Jan 31, 2011 at 1:04 AM

    TacoStateOfMind [OP] TacoStateOfMind

    Nov 12, 2010
    First Name:
    San Francisco
    sold. 2000 Tacoma Prerunner SR5
    Rev Tec 3" Suspension Lift
    I'm having an issue with power loss in my Tacoma. I started it up a few days ago, and when I tried to accelerate, the RPM's stayed at 1000, and the top MPH was 10. I floored it, it sputtered and rolled on at 10 MPH. I pulled over and let it run for a few. When I tried to drive it again, I got 1 1/2 RPM's and 15 MPH. Finally after about 15 minutes, it started to rev up, and accelerate above 20 MPH. It wasn't shifting gears at 3 RPM's, and stayed at 60 MPH. It wasn't down shifting either. An hour later, nothing seemed to be wrong, it was driving and accelerating fine.

    I took it for a test drive the other day and went to drive up a gradual incline. On the way it was shifting, accelerating, and revving strong. Different story when I got it going up hill. The RPM's dropped and it felt like a total loss of power to the engine. I tried to put it in the lower gears, floored it, and all I got in response was more sputtering and loss of power.

    When I turned around and went back down hill I shifted it again, and everything worked. The lower gears down shifted, OD was good, and there was power. When I went back up the hill, the same thing as before happened. I tried this 4 times all with the same response.

    On the way home, and at a level surface, the truck ran strong, accelerating, and shifting normally. So in my conclusion, the engine is strong and the transmission still seems to be "working".
    The check engine light is on. The codes are for 02 and Mass Air Flow censors.

    WTF is going on? I'm taking it in to a mechanic tomorrow, but any insight as to what I could be looking at would be helpful.
  2. Jan 31, 2011 at 9:08 AM

    Flash1034 Well-Known Member

    Oct 29, 2010
    Southern California
    2003 SR5 TRD 4x4 Extracab 3.4 liter

    Sounds like a loose connection to your MAF, which may have led to an overly rich condition. Your codes are likely right on.

  3. Jan 31, 2011 at 4:40 PM

    shitroc Master of War

    Oct 14, 2009
    First Name:
    New Brunswick, Canada
    2002 Tacoma TRD 4X4
    Listed in sig.......
    if thats the codes you got then thats the best place to start. but before buying a new MAF or o2 sensors inspect them first they may just have some serious build up and can be cleaned if so.
  4. Apr 16, 2012 at 7:18 AM

    crow2012 New Member

    Apr 16, 2012
    Pwr loss on acceleration from dead stop. Still under warrantee but Toyota says they cannot fix it if no eng ck lite. Repeatedly building my case for Colorado Lemon law if it is not fixed. Met w/Toyota Rep and test drove but this problem is intermittent. I get up to 10-20 mph and then nothing for 3/4 second; push gas pedal all the way to floor and when it starts-up it starts up slowly. I also called the factory 800 # to get a number assigned for problem and I asked for this number to B classified as a safety issue. I can no longer "risk" trying to merge onto main traffic unless I have 3-times the normal distance for entering traffic because of problem. I have documented 8 pwr losses to date for a truck I purchased Oct 2011.
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