Question about 1992 Toyota Previa

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1991 Toyota Previa

My Previa overheated, and since then has not started. The engin turns over and there is a spark to the plugs.

What could be the matter?

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  • 8 more comments 
  • bteas Oct 06, 2008

    It spins/cranks normally. The car died on the freeway after overheating. The thermostat was bad. The battery, starter, spark plugs are new.



    There is a spark to the spark plug (I checked one).



  • bteas Oct 06, 2008

    Toyota



    Yes I smell raw fule coming out of the exhaut pipe.

  • bteas Oct 07, 2008

    I cranked the engin again and pulled all four plugs. Each plug had gas residual.

  • bteas Oct 07, 2008

    I get a continous flash. No pause

  • bteas Oct 07, 2008

    1) The number 2 spark was white. I will have to get back to you on the other spark color. It will not be until this evening (Pacific Time). The spark plugs are not Toyota. I replaced the the old plugs with the same brand and type (Autolite 3924) and gapped them at 0.044".

    2) I can get an compression gauge. Do you want me to check the cylinder pressure?

    3) There is no moisture under the distributor cap.



  • bteas Oct 07, 2008

    I'll follow up in about 8 hr.



    Thank you

  • bteas Oct 08, 2008

    Compression is horrible.



    Cyl 1 30 psi

    2 35 psi

    3 &4 0 psi

  • bteas Oct 08, 2008

    This may be beyond my ability. The car has 290,000 miles and is like an old friend. But it may be time to let go.



    I'm going to call a shop and follow up.

  • Toyota Ed May 11, 2010

    Do you smell "raw fuel" coming out od the exhaust pipe when you crank the engine over...crank it for at lest 30-45 seconds...

  • Toyota Ed May 11, 2010

    I need to know something before I can assist you:

    Does the engine "spin over" or "crank" FASTER than it used too?

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  • Toyota Master
  • 1,861 Answers

Please crank the engine again, and then remove all 4 spark plugs. Examine them & repost exactly what you see on the plugs.

Posted on Oct 07, 2008

  • 3 more comments 
  • Toyota Ed Oct 07, 2008

    Do this for me:



    Under the hood, there is a small box with a lid on it, approx 1.5 x 1.5 inches. Open the lid, & read under the lid. FInd and locate the terminals E1 and Te1. Using a standard paper clip, jump E1 and Te1 together. Turn the key on. Observe the check engine light. It may flash several times, pause, and flash several times again. Count the flashes.

    example: 2 flashes/pause/4 flashes = code 24.

    Please repost any code(s) that are flashed.

  • Toyota Ed Oct 07, 2008

    the continuous flash indicates that you have no bad issues with the fuel injection system. Good.

    Guess it is time to start looking at mechanical possibilities.

    1.) What colour is the spark to the plugs...white/blue/orange, and are they "Toyota" plugs (important)

    2.) Do you have access to a "compression gauge"?

    3.) Inspect the under the distributor cap for moisture



  • Toyota Ed Oct 07, 2008

    Yes, I am going to need compression test results from all four cylinders. Remove and get rid of the Autolite plugs. Check all four compressions. Repost exactly what all four read. If all are above 150, get genuine Toyota plugs. If the compressions are real low, you may have a internal engine problem.

  • Toyota Ed Oct 08, 2008

    That is not good. Not good at all. I was def hoping that the compressions would be high, to get you back on the road ASAP, but your compression findings reveal what I was fearing...

    Previa engines are *** notorious *** for dropping the valve seats out of the cylinder head when overheated, and this may be your problem. The only way to tell would be to drop the engine down & out (the engine comes out thru the bottom), remove the head & check the valve seats. I have observed failure this many, many times, I am so sorry to say. The low compressions reveal that you have a severe internal engine problem. I am not sure what to tell you, other than the engine needs to be disassembled for more accurate diagnosis. Other than the valve seat issue, the piston rings may have been damaged by the overheating, but, I still believe that the valve seats are your problem.

    I apologize that I do not have a better answer or solution for you. Deepest regrets, my friend.

  • Toyota Ed Oct 08, 2008

    Good idea. If the valve seats are indeed bad, you can expect to replace the cylinder head. This is going to be real expensive. Apologies again. Wishing you the best of luck.

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