Question about 1993 Toyota Land Cruiser

2 Answers

Engine will suddenly start to "sputter" as if not getting fuel. Will not accelerate but also does not stall. When I pump gas, it is like nothing happens. Sometimes I can stop and restart engine and it is OK. Other times, problem persists. So far, it always seems to correct self and goes back to running. Recent new plugs, wires, rotor, dist cap, fuel pump. No change. Replaced throttle position sensor and this has some effect but not sure I am adjusting it correctly. Appreciate any help.

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  • drbongo971 Oct 03, 2010

    I have changed the fuel filter with no effect. This is a 1993 Land Cruiser and the TPS remains an enigma to me. Any help on adjusting this specific TPS would be appreciated.

  • drbongo971 Oct 03, 2010

    Thanks. All of these things make sense and I'll see what I can do with your suggestions. At the very least, you are giving me places to look.

  • drbongo971 Oct 03, 2010

    can you tell me how to adjust the TPS?


  • drbongo971 Oct 03, 2010

    This is helpful but, if, as you say, this cannot be the cause of my problem, I'm still looking. I just replaced the wiring harness(distributor to plugs) and improved performance but did not solve this problem. Used a very good harness. Is this the same as what you call the fuel injection wiring harnesses or do I have another component that I can't see?
    Let me add, when I start the car, it generally idles very fast for awhile. When it has the sputtering problem, I can usually smell exhaust fumes. And, I have 264000 miles on vehicle.
    I know very little and pretend nothing but I am a good learner and very determined. I really appreciate your good help.

  • drbongo971 Oct 06, 2010

    FYI, the money I have spent fixed things that needed fixing. Unfortunately, I did not get this problem in the mix. Now, due to your suggestion, I have carefully gone over the "wiring harness" and seem to have found the problem. One of the connectors is broken and allows the contacts to come and go. When I snug it, the car runs like a top. I'm not sure how to do a final repair on that but I am clearly on track, thanks to your help. You could have, however, rather then referring me to the dealer, suggested that I begin by going over the harness and look for any possible defects. I know that wiring can be very tricky but I also know that it follows the laws of physics and where there is a problem, there is a solution. Anyway, thanks.

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  • Toyota Master
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Adjust the TPS to 1-1.25 volts, also u need to test the system for fault codes, (THIS IS VERY VERY IMPORTANT) that might explain the symptom, but based on what you have said i have replaced many engine fuel injection wiring harnesses for just this problem, the symptom is exactly the same, the wire breaks inside the plastic insulator, under certain heat and engine movement conditions the wire breaks connection u get a sever stutter/cough when u hit the gas, can be very intermittent in nature. I have 35 years of automotive electrical repair to daw on here. Also disconnect the EGR valve and see if it has for some reason been commanded to open at the wrong time by the ECM, this to would cause a stumble.

Posted on Oct 03, 2010

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  • yadayada
    yadayada Oct 03, 2010

    go to the connector of the TPS with a Digital volt ohm meter set it to dc volt scale, ground the black lead to the engine and with a pin point probe lead, probe the wires of the connector until u find the one that shows about 1.0 volt DC, that is the one u read when u adjust the tps, it is usually the bottom wire, a Out of adjustment TPS will not cause the symptom u have, just not possible

  • yadayada
    yadayada Oct 04, 2010

    yes

  • yadayada
    yadayada Oct 04, 2010

    distributor and plugs are not the wiring harness, the engine wiring harness contains all the wires that connect to sensors, fuel injectors and ignition system, u did spark plug wires a very diff thing, I think you are way over your head here, this need to go to a Toyota dealer and be hooked up to a wiring harness break out box, then the wiring to all sensors and components of the fuel injection system can be monitored for the problem, u have already spent a large amount of money and NOT solved the problem, when will enough be enough?

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YOU NEED TO DO A LITTLE TUNE UP.CHECK ENGINE TIMING LOOK UNDER HOOD AT STICKER.CHANGE FUEL FILTER LOCATED UNDER THE HOOD IN ENGINE COMPARTMENT. AT INLET LINE TO THE FUEL RAIL.

Posted on Oct 03, 2010

  • Jonah Oneal Oct 03, 2010

    CHECK THE TPS USING VOLT METER.HOOK METER UP TO SIGNAL RETURN AND GROUND TERMINALS.YOU SHOULD NOT SEE THE 5 VOLT REFERENCE IF SO LOOSEN THE TPS MOUNTING SCREWS.WITH THROTTLE IN CLOSED POSITION ROTATE SENSOR CLOCKWISE OR COUNTERCLOCKWISE UNTIL THE SPECIFIED VOLTAGE OBTAINED.NORMALLY ABOUT 0.5 VOLTS.WHEN DONE TIGHTEN TPS SENSOR SCREWS OPEN TPS SENSOR VOLTAGE SHALL RISE AS YOU OPEN TPS SENSOR WITH.WIDE OPEN THROTTLE POSITION YOU SHOULD HAVE 5.0 VOLTS IF SO ALL IS GOOD.HOPE THIS HELP BECAUSE SOME TPS SENSORS NOT ADJUSTABLE.

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