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2.7L Stalls infrequently, no CEL.

Discussion in '4 Cylinder' started by zeroian, Dec 13, 2011.

  1. zeroian

    zeroian [OP] New Member

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    Greetings,
    I have a 98 2.7L with 230000 miles, automatic. A few months ago, it started stalling when I came to a stop or let off the throttle traveling at speeds <25. In addition, when I am driving on the freeway and take my foot off the gas pedal, the truck sometimes downshifts out of O/D briefly. I have since inspected the vacuum lines, cleaned the air filter, replaced the fuel filter, replaced the IAC valve, replaced the exhaust manifold gasket (it was shot, leaking exhaust into the engine compartment), and about every standard troubleshooting procedure I know of. After all of this, the engine stalls far less frequently, runs smoother, and is a tad faster, nonetheless, it still stalls.

    I am thinking at this point I am dealing with a throttle position sensor or a torque converter/transmission valve/solenoid issue.

    The truck is not throwing any CELs and otherwise drives great.

    Does anyone out there have experience with such issues?
    Thanks,
    Ian
     
  2. Rusty 06 4x4

    Rusty 06 4x4 NBHNC

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  3. wolftree

    wolftree Well-Known Member

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    Have you ever replaced the timing chain?
     
  4. zeroian

    zeroian [OP] New Member

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    No, I haven't replaced the timing chain, but I've considered it as a cause. If it was the chain, could it be so worn and not throw a cel? Also, could the the chain be causing the random down-shifting too?
     
  5. coalminer

    coalminer Well-Known Member

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    dry flow drop in filter
    have you tried cleaning throttle body, i had the same issue with a chevy and that took care of it.
     
  6. zeroian

    zeroian [OP] New Member

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    Yes, throttle body removed and cleaned. IAC valve replaced.
     
  7. wolftree

    wolftree Well-Known Member

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    zeroian, I believe that yes, the timing chain could be worn just enough to stall, yet not throw a CEL. I expect that the downshift is caused by this as well. Just as you would downshift a manual transmission to compensate for a load change, the computer is telling transmission to shift as well. You have eliminated fuel and air as a source of the problem it sounds.That only leaves timing.
     
  8. Dustrider

    Dustrider Well-Known Member

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    I have cold stalling
    and lack of power

    '98 2.7 stick
    within the past two months
    so far I have changed with new toyota parts :
    IAC valve (cleaned throttle body passages )
    MAF sensor
    TPS sensor
    ECT sensor
    EGR vacuum modulator
    spark plugs and wires
    air filter
    in tank and inline fuel filters
    fuel pump
    fuel pressure regulator
    ECM computer (toyota remnan)

    double checked and/or cleaned these parts:
    EGR VSV
    EGR valve
    catalytic converter
    muffler
    triple checked for vacuum leaks (even at PSump and brake booster)

    gave up and took it to toyota dealer for the $100 diagnosis said compression was 140-150-180-190, they could not find anything after 5 hours and said it needs the head tore off
    took it to another local mechanic, they checked, timing, fuel pressure and IAC couldnt find anything and suggested valve job

    I pulled the head today and put the cams back in and the valves dont look too bad on the bench
    cam chain looks tight
    first line up between valve marks and balancer marks was 5 degrees off , turned it over clockwise 360 and it came up dead zero TDC , with the cam dots together so cam timing seems good

    maybe head gasket leaking between cylinders ?
    cylinders look real good , no scoring doesnt use ANY oil in 10,000 miles

    I shook the cam chain real hard at the links and cant find play
    the adjuster was about in the middle of its range and sliding smoooth, ratchet holding

    started raining (no garage)


    now what !
    just put it back together ?
     
  9. wolftree

    wolftree Well-Known Member

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    Before you spend another dime on your Tacoma, check your frame carefully for rust through. 98s are part of the Toyota buy back for frame rust.

    As for the head gasket, is there any visible signs on the block or head of leaking?
     
  10. Dustrider

    Dustrider Well-Known Member

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    another dissapointment : no signs of a break in the sealant between cylinders
    the valves look old and nasty but Ive seen worse
    I am wondering if the tech at the toyota dealer did the comp check wrong , removing one plug at a time \anyway , I paid for dignosis and got three opinions that bad valves are the cause of the stalling because the engine control system cannot compensate

    Im in Californica, no rust on the frame that I can find
    I'll look again but it sure will be a first to ever be compensated for anothers goof, win a prize, or get a windfall
    everything in life is a bizarre grunting uphill struggle just like this nightmare lemonota
    I would never imagine getting market value from toyota for this swayback weak POS, I could more likely imagine winning the lottery
     
  11. JohnnYp

    JohnnYp Member

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    throttle body spacer k&N cold air intake stage 2 clutch kit Gibson cat back exhaust kit bed liner and rocker panel lined
    If you dont mind me asking ... how did you check/ clean the cat? JW


    Ian ( op )
    Have you made sure your trans fluid is toped off and not super low ?
    could cause the torque converter to not disengage at stops causing the stall
     
  12. Dustrider

    Dustrider Well-Known Member

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    update on mine
    I replaced the head, all new parts , and it runs like new now

    no more cold stalling
    waymore power uphill
    real smooth idle
     
  13. Dustrider

    Dustrider Well-Known Member

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    not aware of a cleaning method but you can take it off and you should be able to see straight through the honeycomb easily
     
  14. JohnnYp

    JohnnYp Member

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    throttle body spacer k&N cold air intake stage 2 clutch kit Gibson cat back exhaust kit bed liner and rocker panel lined
    ahhh.. of course the ole peak down the pipe trick , lol


    what you gunna do with your old head hmmmmmmmmmmmmmmmmmmmm? :D
     
  15. Dustrider

    Dustrider Well-Known Member

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    $100 + shipping
    with cams , cams look excellent, no cracks or stripped threads, probably needs 4 ex valves
     
  16. JohnnYp

    JohnnYp Member

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    throttle body spacer k&N cold air intake stage 2 clutch kit Gibson cat back exhaust kit bed liner and rocker panel lined
    ^ pmed
     
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