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My 1997 Toyota 4 Runner V6 2WD is cutting off when I am in Drive or Reverse. Sometimes if left in Park for a few minutes it will do it as well. When I crank it up, i put it in nuetral rev the engine some and then put it in gear hitting the gas right away to prevent it from shutting off. It is not bogging down it just shuts off. The only code it is giving is numerous misfires on pretty much all 6 cylinders. I have replaced plugs, wires, coil packs, TPS sensor, CAM sensor, MAF sensor, vacuum lines, air filter, fuel filter, and even a bent fuel line. I'm a single mom with no extra to keep pouring into this car. Any idea where to go from here? This process of elimination is getting to costly.

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The code I am concerned with is the random cylinder misfire code you said it has, that is more than likely a possible lean fuel condition, what must be done is to have the engine hooked up to a fuel pressure monitor and watch the fuel pressure when the engine stalls out, if the stall coincides with the engine stall the electric fuel pump may be defective. If the pump proves not to be the problem then you must have the car hooked up to a flight recorder, this is a special tool/device the dealer has that can monitor the electronics that run the engine and if and when the engine stalls they can go back to the shop and a trained technican can read all the engine related data and see what is causing the stall, this can be anything from a defective engine wiring harness to a defective Powertrain control module(PCM). There is no cut and dry answer to this problem, it is a series of tests, most of which will require a trip to the dealer to have done. You have replaced allot of parts, for what reasons you don't say, but if you where just guessing that these parts may cure the stall that was a huge waste of your money and time. PLease keep in mind that the problem must be confirmed to have any hope of repairing it.

Posted on Feb 08, 2012

  • 3 more comments 
  • Lori Cochran
    Lori Cochran Feb 08, 2012

    I did explain why I replaced the parts I have replaced. Getting a misfiring code on the plugs led me to start with the obvious reasons, plugs, wires, etc. Thanks for your help, but other than just keep doing a process of elimination, is not really giving me an answer. I was hoping you could give me the next directions to go in.

  • yadayada
    yadayada Feb 09, 2012

    I have given you the next level of testing, that would be a dealer flight recorder, I would have checked allot of things before just throwing parts at the problem. That seldom fixes any serious problem, 35 years of dealer experience tells me this. Please read my first answer, the next level of testing is all there. I can't recommend any parts because diagnostic work is required before any more parts are replaced, do you see this?

  • yadayada
    yadayada Feb 09, 2012

    Also I saw no mention of any fault codes or diagnostic routines performed that prompted multiple parts replacement, a random misfire is seldom if ever plugs and plug wires, that would be a few cylinders settings lets say codes P0301 0r P0304 as an example. At this point your money is best spent at the service dept of your local Toyota store, the techs there have the tools and the training to fix your car..

  • Lori Cochran
    Lori Cochran Feb 09, 2012

    I do see what you are saying. I should have said before the codes were giving 300-1...2.4.6 This is why it was suggested to start with those parts. Thank you for your help. Hopefully it will be something simple.

  • yadayada
    yadayada Feb 09, 2012

    Hi Lori
    Lets start over here.What I'm trying to say about misfire code is that you may have one cylinder setting a code, maybe #1 for instance, but more than three, no that is the cylinder not getting fuel or getting no spark from other reason like a defective ignition control module, you may have a leaking intake manifold gasket that is causing misfire codes or a failing fuel pump that at times slows down and creates a low fuel pressure condition, there are lots of possibilities and all must be eliminated before what we call the "Root" cause is found, and there is one, that is for sure, I have never failed to fix any problem like this in my 35 years as a professional auto technican. I know you are short of money, but I have nothing to gain by spending it, I am only suggesting what must be done to find the problem(s)the the car.

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