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Misfire Cylinder 3 Running Rough

Discussion in '1st Gen. Tacomas (1995-2004)' started by ArsT100, May 23, 2011.

  1. May 23, 2011 at 4:37 PM
    #1
    ArsT100

    ArsT100 [OP] Member

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    I am getting a misfire on cylinder 3 code along with a check engine light on my 97 t100 with the 3.4 engine. The spark plugs are fairly new, I replaced the coils and wires since the problem started. Last week I replaced the cylinder 3 spark plug and the engine ran good for about 100 miles and the check engine light went off. The light is back on and the truck is back to sometimes running smooth sometimes choppy. Bad Fuel Injector??
     
  2. May 23, 2011 at 4:53 PM
    #2
    davestaco

    davestaco TW's number one gear whore

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    check the injector....
     
  3. May 23, 2011 at 5:17 PM
    #3
    medic2230

    medic2230 Ditch Doctor

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    What kind of plugs?
     
  4. May 23, 2011 at 7:03 PM
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    davestaco

    davestaco TW's number one gear whore

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    i wold drive to much while its running like that. its a good way to trash a piston. best bet is to read the plugs if your running lean if could be a fouled injector. i had the same issue. if its not the injector try a new plug. you might have gotten a bad plug. if not that you can do a compression test.
     
  5. May 25, 2011 at 3:20 PM
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    ArsT100

    ArsT100 [OP] Member

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    I did a compression test today and 4 of the cylinders where about 180 psi and 2 where at 190. Those seem like good numbers considering 180k miles on the motor. I did install Bosch plat. 2 spark plugs which I later discovered are frowned upon, but could they cause the truck to run this poorly? I guess the next thing to check is the injectors.
     
  6. May 25, 2011 at 3:39 PM
    #6
    4WD

    4WD cRaZy oLdmAn

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    Your comp. numbers are fine, you said it threw a code (engine light) What was it? if diagnosed, Bosch's are good plugs just not for Toyotas I guess (split fire for 3.4) Not sure its an injector, maybe faulty coil pack ? You replaced wires too huh... Hmm , ran good for a 100 miles then back to shit

    Could be alot of things next time it throws code you need to go to AAMCO or some other freebie place that will put it on a code reader..
     
  7. May 25, 2011 at 6:33 PM
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    davestaco

    davestaco TW's number one gear whore

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    i forgot about them lol definatly replace wires and coil packs....compression sounds ok....was your check engine light flashing? still sounds like a injector to me
     
  8. May 25, 2011 at 6:36 PM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Yes they could. Use the NGK dual grounds.
     
  9. May 25, 2011 at 6:41 PM
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    davestaco

    davestaco TW's number one gear whore

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    x2 and then HAVE to have dual grounds....
     
  10. Jun 8, 2011 at 4:32 PM
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    ArsT100

    ArsT100 [OP] Member

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    I still haven't found the problem but I did get a P0441 code (Evap Emission Control System Purge Flow Fault) instead of a missfire code but then I cleared it and it went back to a missfire code (my mistake above, the missfire has been on cylinder 2 all along). I've read a post on the P0441 code and it coulld be many things that I will start to check out.
     
  11. Jun 8, 2011 at 4:42 PM
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    tacobox

    tacobox Evasive Maneuvers PMKMS

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    A P0441is usally the evap canister and possibly the duty valve aswell if it doesn't come on the canister. (Some do some don't with toyota). Do you have spark on that cyl? Also did you check the plug gaps before your install?
     
  12. Jun 8, 2011 at 4:56 PM
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    ArsT100

    ArsT100 [OP] Member

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    I've tried different plugs on that cylinder and still got the missfire, and yes I have spark on the cylinder. Is there any way to check if it is the evap canister or duty valve before I replace more stuff that doesn't need replacing?
     
  13. Jun 8, 2011 at 5:48 PM
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    tacobox

    tacobox Evasive Maneuvers PMKMS

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    If you're sure spark is present then, IMHO the evap code might be just coincidence and has nothing to do with the misfire. Might want to send atleast the one injector to be flow checked, cleaned and recalibrated. All of the injectors if you can swing it.
     
  14. Jun 8, 2011 at 6:53 PM
    #14
    jblair

    jblair Well-Known Member

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    if you have spark, you're either missing air or fuel. Try the injector, that's probably it.
     
  15. Jun 9, 2011 at 5:40 AM
    #15
    tacobox

    tacobox Evasive Maneuvers PMKMS

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    Or for a quick free test, you could swap the injector to another cylinder and see if the misfire moves with it. If it does, there's you "smoking gun"
     
  16. Jun 9, 2011 at 10:09 AM
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    trded

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    mark and swap injectors, spark plugs, and coil packs.
     
  17. Jun 9, 2011 at 11:05 AM
    #17
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Tighten the fuel cap again for the 441 code.
     
  18. Jun 9, 2011 at 12:44 PM
    #18
    davestaco

    davestaco TW's number one gear whore

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    win 1
    win2
    win3

    win4


    thats 4 free things to try to help find the problem....damn what would the world be like with out TW
     
  19. Jun 9, 2011 at 3:19 PM
    #19
    ArsT100

    ArsT100 [OP] Member

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    NOt sure what "tighten the fuel cap again" means, I tighten it till it clicks always, can you clearify?
     
  20. Jun 9, 2011 at 3:21 PM
    #20
    ArsT100

    ArsT100 [OP] Member

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    I've swapped the plugs and coil packs with no difference with the code, I will swap the injectors next.
     
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