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3.4 Tacoma engine miss

Discussion in '1st Gen. Tacomas (1995-2004)' started by Tacomaman27, Aug 5, 2015.

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  1. Aug 5, 2015 at 10:48 AM
    #1
    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Got a 4x4 v6 Tacoma the truck will idle fine but want take gas it hesitates an backfires through the intake an out the air filter box. Truck will only idle can't really move out of its tracks I changed the maf still no luck. The engine light is on but can't drive it to a parts store to get it scanned. Any help ?
     
    Tacomaman27, Aug 5, 2015
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  2. Aug 5, 2015 at 5:54 PM
    #2
    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Anyway think I mighta solved the problem. Noticed the converter getting hot
     
    Tacomaman27, Aug 5, 2015
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  3. Aug 6, 2015 at 1:52 PM
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    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Replaced the converter today. Still same way. Any help ? ?
     
    Tacomaman27, Aug 6, 2015
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  4. Aug 6, 2015 at 2:01 PM
    #4
    Wulf

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    Wulf I never finish anyth

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    Have you tested the Throttle Position Sensor?
     
    Wulf, Aug 6, 2015
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  5. Aug 6, 2015 at 2:13 PM
    #5
    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Tacomaman27, Aug 6, 2015
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  6. Aug 6, 2015 at 2:26 PM
    #6
    KdF

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    KdF Old Rednek Type

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    East-ByGod-TEXAS!
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    2000 Prerunner SR5 TRD 2WD
    Change TPS if you have one
    Clean Throttle Body and IAC with the proper fluids.
     
    KdF, Aug 6, 2015
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  7. Aug 6, 2015 at 3:08 PM
    #7
    00yotasr5

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    00yotasr5 Well-Known Member

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    check spark plug, my number 3 plug was crack and it back fire through the intake.
     
    00yotasr5, Aug 6, 2015
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  8. Aug 6, 2015 at 6:16 PM
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    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Could a coil pack do that to. Now the engine light went off
     
    Tacomaman27, Aug 6, 2015
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  9. Aug 6, 2015 at 7:10 PM
    #9
    CodeSeven

    #9
    CodeSeven LOC: 33.781461, -115.867251

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    CodeSeven, Aug 6, 2015
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  10. Aug 6, 2015 at 11:00 PM
    #10
    00yotasr5

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    00yotasr5 Well-Known Member

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    crack spark plug.jpg
    it could be a possibility but I rule that one out after swapping coils around. oem plugs btw, small hairline crack on the porcelain (3k only).
     
    00yotasr5, Aug 6, 2015
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  11. Aug 7, 2015 at 2:05 PM
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    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Changed plugs an fuel filter still same way
     
    Tacomaman27, Aug 7, 2015
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  12. Aug 7, 2015 at 2:09 PM
    #12
    Taco me elmo

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    Taco me elmo Here, Eat some paint. Drink some Bleach.

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    Sounds electrical, have you checked for chewed wire harnesses?
    How do your o2 sensors look? fully plugged in to wire connection?
     
    Taco me elmo, Aug 7, 2015
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  13. Aug 7, 2015 at 4:54 PM
    #13
    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Haven't checked the wiring but I did notice a o2 sensor was loose and I tightend it back
     
    Tacomaman27, Aug 7, 2015
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  14. Aug 7, 2015 at 5:01 PM
    #14
    CodeSeven

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    CodeSeven LOC: 33.781461, -115.867251

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    can't be an O2 sensor if youre having legitimate backfires. it has to do something with the ignition. that being: coil, coil boots, wires, plugs, crank/cam sensor, ignition control module. slim chance of being an injector or the computer. you really need to run a diagnostic machine on it.

    it COULD be a bad intake or exhaust valve allowing the explosion to pull back at the wrong times. but then again, a bad valve spring, keeper, rocker, camshaft lobe, and/or pushrod could do the same thing. check for compression to rule out all of these!
     
    CodeSeven, Aug 7, 2015
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  15. Aug 7, 2015 at 5:02 PM
    #15
    CodeSeven

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    CodeSeven LOC: 33.781461, -115.867251

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    Just realized something!!!

    if youre using platinum spark plugs, they have a much higher resistance than stock nickel, copper or even iridium. They might be putting a LOT of strain on your coils. enough in fact to give bad spark!
     
    CodeSeven, Aug 7, 2015
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  16. Aug 7, 2015 at 5:23 PM
    #16
    00yotasr5

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    00yotasr5 Well-Known Member

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    hmm... getting a code reader that can read post mil light be good. One thing I would suggest is having Toyota do a health check, that scan can tell you many things that a code reader can't do.
     
    00yotasr5, Aug 7, 2015
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  17. Aug 9, 2015 at 7:39 PM
    #17
    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Got them from Toyota dealer. There dual denso
     
    Tacomaman27, Aug 9, 2015
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  18. Aug 10, 2015 at 8:25 PM
    #18
    ThunderOne

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    ThunderOne Well-Known Member

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    Could be a bad wire, especially if you already swapped coils around and checked plugs.
     
    ThunderOne, Aug 10, 2015
    #18
  19. Aug 11, 2015 at 1:32 PM
    #19
    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    I scanned it today. Didn't show any codes So far I have switched the coil packs around put new plugs an a fuel filter.
     
    Tacomaman27, Aug 11, 2015
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  20. Aug 11, 2015 at 4:15 PM
    #20
    Tacomaman27

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    Tacomaman27 [OP] Active Member

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    Also just ruled out timing belt an timing all in good shape
     
    Tacomaman27, Aug 11, 2015
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