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6 Cly losses pwr

Discussion in 'Technical Chat' started by 1957, Sep 23, 2013.

  1. Sep 23, 2013 at 12:21 PM
    #1
    1957

    1957 [OP] New Member

    Joined:
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    Greg
    Tacoma WA
    Vehicle:
    2004 Tacoma SR5 4x4 TRD
    Here the scoop old 88 22re truck finally needed replaced. I love Toyota trucks so searched for one that would last found so many with high mileage, then got a 04 6cyl

    one owner nice looking rig 85K. The dude said he never had a problem never did anything but oil changes. So its very clean under the hood.. It stated having a slight miss

    just a quick loss of power going down the freeway, I had hope the 90K mile service with new fuel filter might take care of this but did not. Now this will happen in spurts

    might run just fine around town for several days then act up. I get this mostly around 2200 RPM I will add it sometimes falls flat taking off from a stop, will also add

    several times it started this after running perfect on a weekly trip to a doctor 35 miles there 20 minutes shut down with in the dr then start up and it immediately

    starts doing it. I have had a pretty good guy trying to figure this out he replaced the 1 Air Fuel Ratio Sensor 2 Crankshaft Position sensor 3 Camshaft position sensor.

    Still no relief So I had a a pretty good guy with a dyno tune have a look he thought it was in one of the two TPS on the TB was getting a 8% different reading between the two

    he said I should have the dealer look at it, Its not throwing codes BTW. So back to Fred he wanted to check the tps sensors on a ohm meter will not sure why

    he decided not to instead he tapped wires into most all the sensors to his computer ran a pressure gage into the the fuel line, While he did all this he cleaned the MAF sensor

    and it ran perfect so we thought we had it and it ran great three weeks went goofy again replaced the MAF sensor still no relief. So again the symptom's are for the most part running at a steady

    throttle it has a repeated quick recovery loss of power. One thing interesting I did a 200 mile road trip the other day in 5th gear at 2200 RPM did it constantly I had to slow down went to 4th gear for about 15 miles 2750 or so RPM no miss. I'm really at a loss here I apologize for such a long winded post.. Thanks for any help.. PS Sorry pasted in with those gaps
     
  2. Sep 23, 2013 at 1:39 PM
    #2
    obscurotron

    obscurotron Well-Known Member

    Joined:
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    N. Nevada
    Vehicle:
    '14 DCSB 4x4
    Too many to list, and I've probably forgotten a bunch.
    I think this was a problem on some of the '04's with the throttle-by-wire system. Check over on tacomaterritory.com for a thread about it. Don't quote me, but I think the fix was to replace the entire throttle body.


    My '04 had the throttle-by-wire, not a cable-controlled throttle, but other 04's did have a cable. It seemed to be a mid-production change. It's worth looking at as a possibility if you don't have a cable-based throttle.


    Injectors, fuel tank sediment and spark plugs come to mind, too. I know you had a 90k tuneup done, but the 5VZ-FE is picky about plugs - it uses a K16TR11 plug (Denso) with a dual electrode.


    At 90k, you should be due for the timing belt, too. Was that done before you got the truck?
     
  3. Sep 23, 2013 at 3:48 PM
    #3
    1957

    1957 [OP] New Member

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    Greg
    Tacoma WA
    Vehicle:
    2004 Tacoma SR5 4x4 TRD
    Hi Thanks for the Reply
    Yes I had the timing belt & new water pump with the 90K service @ 87K
    As far as I can tell TB is cable drivin ? it does have 2 TB sensors ? This was acting up before the 90K service, I will check on the plugs. Thanks Greg

    **Updated Reply **

    Did check they are the correct plugs.

    These two links I read over the last couple months sound close to my trouble.
    http://www.tacomaworld.com/forum/toyota-trucks-suvs/227204-2003-toyota-tacoma-v6-hesitation.html
     
    Last edited: Sep 24, 2013
  4. Sep 24, 2013 at 1:54 PM
    #4
    1957

    1957 [OP] New Member

    Joined:
    Sep 23, 2013
    Member:
    #113087
    Messages:
    4
    Gender:
    Male
    First Name:
    Greg
    Tacoma WA
    Vehicle:
    2004 Tacoma SR5 4x4 TRD
    I took my vin # to the Toyota parts dude, It appears I do not have the throttle by wire to the TB but the parts guy acted like he never heard of one.His diagram only shows 1 TPS sensor where I have 2, I guess I should have the dealer try to figure this trouble out.
     

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