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Bad engine misfire?

Discussion in '1st Gen. Tacomas' started by tweak240s14, Apr 14, 2013.

  1. Apr 14, 2013 at 7:20 PM
    #1
    tweak240s14

    tweak240s14 [OP] New Member

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    Jasper Al
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    Hey ya'll. Im a newbie on this forum. I have a bad engine miss on my 99 prerunner. Here's a little background....
    99 PreRunner 2.7L
    319,000 mi. ( 125k on engine)
    AUTOMATIC
    replaced radiator (20k ago)
    CEL : coded p0420 for 10k miles or so.
    New wireset, new denso plugs, new twin coil packs, new fuel filter

    Recently started experiencing a bad miss. Pulled a p0301 misfire code. Changed the plugs, wires, fuel filter and "seafoamed" the intake via the brake booster vacuum.
    No change.
    Did compression test today. Numbers all over the plce. Not exactly sure if i did it right.... pulled efi fuse and relay then turned the engine over for 7 seconds. Then recorded my #'s one at a time after 6 seconds crank on each cylinder test.
    #1 - 99
    #2- 120
    #3- 109
    #4- 114

    Used jumper cables to keep battery hot...
    Do i need to crank it for a longer period if time for each cylinder? Or could it really be that bad?
    I use BG44K fuel treatment monthly.
    i am open to any and all help.
    Thank you all!
     
  2. Apr 14, 2013 at 11:35 PM
    #2
    4WD

    4WD cRaZy oLdmAn

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    Doug
    Gardnerville, Nevada
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    Grey wire MOD, deck plate, diff breather MOD, 2nd gen. OME 883# on Tundra 5100's, OMD custom 3" leafsprings, rear shock relocation, Ivan Stewart TRD rims w/285/75/16's, '02 bumper MOD, Famous Fabrications sliders , LED interior/exterior lights, bed bar, Custom tube bumper, Old school KC day lighters,Red Ring 8" HID flood, Kenwood vhf 2M.. umm some other shit I'm forgetting right now
    Welcome to TW , did you pull all the plugs first ? & actually your numbers are within specs for the most part..
     
  3. Apr 15, 2013 at 5:30 AM
    #3
    tweak240s14

    tweak240s14 [OP] New Member

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    Thx Doug. Yes, i did remove all plugs at one time, then I began the compression test.
    Could it be an issue that is symptomatic from the EGR code? I still havent corrected that yet. Forgot To mention I replaced the o2 sensors about 4,000 miles ago.
    Any other suggestions?
     
  4. Apr 15, 2013 at 3:43 PM
    #4
    tan4x4

    tan4x4 Well-Known Member

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    Bilsteins, OME 881's, 3-leaf AAL, Detroit TruTrac, stock gears, stock-size tires, Michelin LTX AT2, Tranny skidplate, sliders, UltraGauge, PowerTank, CB
    P0420 means "Catalyst System Efficiency Below Threshold (Bank 1)"
    Did you mis-type? P0402 relates to the EGR system.
     
  5. Apr 15, 2013 at 4:56 PM
    #5
    tweak240s14

    tweak240s14 [OP] New Member

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    Yes sir. My bad p0402.... mis type. I was trying to narrow down cleaning the egr..... the vacuum switch replaced.... or the temp sensor? Too many variables to decide... hate to just throw $ at it. Ive never seen the specs on the conpression test i did... do u happen to agree with Doug? I am clueless.clueless
     
  6. Apr 15, 2013 at 7:43 PM
    #6
    tweak240s14

    tweak240s14 [OP] New Member

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    Its is entirely possibly a typo..... ill have to check it again in the a.m. thanks for noticing Rick. Any other suggestions are greatly appreciated!
     
  7. Apr 15, 2013 at 9:45 PM
    #7
    4WD

    4WD cRaZy oLdmAn

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    Grey wire MOD, deck plate, diff breather MOD, 2nd gen. OME 883# on Tundra 5100's, OMD custom 3" leafsprings, rear shock relocation, Ivan Stewart TRD rims w/285/75/16's, '02 bumper MOD, Famous Fabrications sliders , LED interior/exterior lights, bed bar, Custom tube bumper, Old school KC day lighters,Red Ring 8" HID flood, Kenwood vhf 2M.. umm some other shit I'm forgetting right now
    No one ever agrees with me.....:D I say your numbers are within specs for combustion, if you take your lowest (99) & if the highest (120) that makes a 20lb +/- difference which may be a tad wide but you'd still have enough to fire pretty normally, but I notice that the highest & lowest are next to one another cylinder wise, something could be suspect.. How's the CAT ? Any unusual odors coming from exhaust ? Bad CAT doesn't always throw a code I'm told..just throwing it out there
     
  8. Apr 16, 2013 at 8:07 AM
    #8
    tan4x4

    tan4x4 Well-Known Member

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    P0402 - "Exhaust Gas Recirculation Flow Excessive Detected"

    This sounds like there is too much exhaust being recycled.
    2 possible culprits come to mind:
    - the main EGR valve stuck partially open (which should also cause a bad idle)
    - bad EGR modulator

    The valve can be removed and cleaned (via soaking in a solvent ?)
    The modulator can be VERY EASILY swapped out with a known good one for a test. I'd go to a nearby pick-n-pull for the modulator.
     
    Last edited: Apr 16, 2013
  9. Apr 16, 2013 at 8:17 AM
    #9
    tan4x4

    tan4x4 Well-Known Member

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    Bilsteins, OME 881's, 3-leaf AAL, Detroit TruTrac, stock gears, stock-size tires, Michelin LTX AT2, Tranny skidplate, sliders, UltraGauge, PowerTank, CB
    Yes, I agree with him. The compression is a bit low on all cylinders, but pretty consistent (therefore has less power, more blowby, but shouldn't cause a mis-fire). However, I'm not a real expert in this area. Doug likely has more experience in rebuilding than I do (I've only done one).
     
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