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Rough idle and missing

Discussion in '1st Gen. Tacomas (1995-2004)' started by shark19, Jul 2, 2009.

  1. Jul 2, 2009 at 5:32 PM
    #1
    shark19

    shark19 [OP] Member

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    I have a 2002 v6 4door Prerunner TRD
    Yesterday my wife started up the truck to come home and it started rough and has no power. Seems like the truck is misfiring. Sounds like a little rice burner. Local shop checked out the wires, plugs, and module units at each cylinder. When at idle the truck was throwing misfire codes all over the place.

    Left the shop with no answers wires good, coils good, plugs good. They said it might be the computer. Any ideas?

    I am thinking injectors or computer???
     
  2. Jul 2, 2009 at 5:33 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    What code did you get?
     
  3. Jul 2, 2009 at 5:38 PM
    #3
    shark19

    shark19 [OP] Member

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    Not sure, I need to get a reader at home. When he had the more expensive diagnostic computer hooked up it did not show a misfire while driving even though obviously no power and sounded like a honda civic. While at idle the cylinders were randomly misfirng like crazy and real pretty rough. The engines settles into a type of surge if left idling.
     
  4. Jul 2, 2009 at 5:56 PM
    #4
    kevhogaz

    kevhogaz Low Speed, High Drag

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    You didn't put in aftermarket plugs did you? Or aftermarket wires? If we had the codes, it would really help. Were they P0300 or similar?

    P0171? I've seen air flow meters do the same thing, and also set cat codes at the same time (P0420), and lean conditions at one or both of the O2 sensors.
     
  5. Jul 2, 2009 at 6:05 PM
    #5
    shark19

    shark19 [OP] Member

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    Will get codes. I changed out the plugs before a trip in April from Florida to Illinois. Not a single problem until yesterday. Do not remember what plugs were put in (think NGK). Will pull one in the morning.
     
  6. Jul 2, 2009 at 6:11 PM
    #6
    kevhogaz

    kevhogaz Low Speed, High Drag

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    A lot of Toyotas won't tolerate aftermarket plugs. They usually just set codes, and not all the roughness of idling your describing. I'm betting it's something else.
     
  7. Jul 3, 2009 at 5:07 AM
    #7
    shark19

    shark19 [OP] Member

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    The plugs in the truck are Bosch Platinum 2s. Anyone know where to get an electronic version of the shop manual? I have the Land Rover Rave program for my old discovery and the thing is great. Can't find one for the Tacoma. The Hanes and Chilton books never seem to help enough.
    The codes the truck was giving this morning are:
    P1300
    P0306
    P0305
    P0300
     
  8. Jul 3, 2009 at 6:13 AM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    First, I would get rid of those plugs. I have heard of them causing issues in the past. Get the OEM Denso plugs, gap BOTH sides to .040 to .043
     
  9. Jul 3, 2009 at 6:27 AM
    #9
    XBrown

    XBrown Spartacus!

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    I would take a look at fuel pressure too, along with the plugs. I believe these still used the waste spark system, making spark plug type and gap critical. Also, make sure the coil pack for cyl. 5 and 6 is screwed down tight.
     
  10. Jul 3, 2009 at 6:44 PM
    #10
    kevhogaz

    kevhogaz Low Speed, High Drag

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    If you get factory plugs, they'll be gapped for you. If you drop one, it's toast, go buy another one.

    Your codes are cylinder 5 misfire, cylinder 6 misfire, and a random misfire code (P0300). The P1300 is an igniter circuit malfunction. Check your coils for the spark jumping outside the boot, and hitting the side of the spark plug tube.

    Get rid of those Bosch plugs, and you should be back in business.
     
  11. Jul 3, 2009 at 7:20 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Though they say they are "Pre Gapped", or whatever, best to check them anyway. Only one time have I found them gapped correctly.
     
  12. Jul 3, 2009 at 7:24 PM
    #12
    kevhogaz

    kevhogaz Low Speed, High Drag

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    I never worry about it. If they're not right, I get paid to do 'em again. Sometimes it's nice being paid to work on cars!
     
  13. Jul 3, 2009 at 7:30 PM
    #13
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    ;)
     
  14. Jul 4, 2009 at 6:07 AM
    #14
    shark19

    shark19 [OP] Member

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    Thanks for all the help. Let you know how it turns out.
     
  15. Jul 4, 2009 at 12:05 PM
    #15
    magikbean562

    magikbean562 once flirted with danger, danger got clingy

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    if its an 02, get the ngk platinums. thats what pepboys recommended and my 4runner runs great. good luck :thumbsup:
     
  16. Jul 4, 2009 at 1:01 PM
    #16
    kevhogaz

    kevhogaz Low Speed, High Drag

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    He's already got aftermarket plugs, and that's what's causing his problems. Why would he put in another plug, that's most likely gonna cause the same problems?

    I'm a Toyota certified mechanic, and I do not recommend Bosch, or NGK plugs. I think I'm more qualified to diagnose an engine miss, than a kid at Pep Boys.
     
  17. Jul 4, 2009 at 3:14 PM
    #17
    humanoid

    humanoid bite me

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    Check to make sure all the plug wires are securely "snapped" onto the plugs. I changed out the plugs on one of my other cars and neglected to "snap" one of the wires properly onto one of the plugs and it ran like crap and was missing. Snapped it back in and it runs like a charm.
     
  18. Jul 5, 2009 at 8:56 AM
    #18
    shark19

    shark19 [OP] Member

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    Wires good. Can't get the plugs until Monday. Everyone is either closed or has to order. We had no reports of misfires when driving the truck, even though it only had half the power and sounded like crap, with the real time diagnostic computer attached. Only when we came to an idle did the misfires start to report and throw codes. Anything else that is a likely cause I could try today? Seems like the plugs may be throwing the codes but not the overall problem. Everything is hooked up good and no visible arching when it was completely dark out.

    I just do not want to screw something up worse trying to find the problem. By the way how are the cylinders numbered in the six cylinder?
     
  19. Jul 5, 2009 at 9:22 AM
    #19
    kevhogaz

    kevhogaz Low Speed, High Drag

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    Don't over-analyze the problem. Start with the plugs, and go from there. I'm sure that's your problem.

    The cylinders are numbered in this order. Looking at the truck from the front, cylinder 1 is on your left, in the front. Then 3 and 5 on that bank. The opposite bank is 2 4 6, starting from the front.
     
  20. Jul 5, 2009 at 9:23 AM
    #20
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    X2! I have seen these plugs cause problemss in the Toyota engines in the past, and give the same symptoms.
     
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