Question about 1997 Chevrolet Tahoe

2 Answers

Losing coolent into oil and milky looking now

I've lose about 3 gal of coolent and it went into my oil, Its milky looking and about 3c over full on dipstick. It died and overheated but no knocking, i dont know if its a cracked head or manifold. How can i check to see why its going into my oil.

Thank you
josh

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  • 3 more comments 
  • supaj777 May 28, 2009

    no there was no smoke coming from the tail pipe. I lost all the water and anitfreez i was puting in in two days, i just drained all the oil and thinking if i should start take it all apart, but how can i test to see if it is my haeds or intake.

  • supaj777 May 28, 2009

    if you could give more feed back that might help me more

  • supaj777 May 29, 2009

    Thank you molson for the comment i will try that and see what happens. one more for you if i got water into the motor will the valves and rods be bad .

  • supaj777 May 29, 2009

    Well molson i just filled the radi. up all the way and all the water when right into the oil pan without putting the presser reg. on it. so what do you think?



    josh

  • supaj777 May 30, 2009

    Well molson its done i just had someone buy the turck for 3000 and i said f--k it i thank you for your help but im done with that truck. I hope i the next truck i get done have problem but if it does i'll look you up.



    Thank You

    Josh

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  • Chevrolet Master
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Was there any white smoke coming from the tail pipe??? If not most likely it's a bad intake manifold gasket. Regardless change the oil soon as you can since the antifreeze is corrosive to the crankshaft bearing. 
Good luck and keep me posted

Posted on May 28, 2009

  • 2 more comments 
  • Harvey N Tawatao
    Harvey N Tawatao May 29, 2009

    You can try to do a compression test on the heads to see if you have a head gasket gone bad. The cylinder with the bad compression will be the place where the gasket has failed. The spark pug will also help tell if the gasket is bad and if it's really bad you'll see traces of fluid and oil on the spark plugs. 


    As for the manifold there common on the GM sine there made of plastic and are know for cracking do to time and heat between the left and right side heads. If your lucky you may see antifreeze pooling on the manifolds and smell the leaking. If it's a crack intake manifold you should have a bad idle and hear a whistling or sucking noise as the engine sucks air though the cracked or leaky gasket.

  • Harvey N Tawatao
    Harvey N Tawatao May 29, 2009

    Rod and Valves should be good since the Gasket is bad. The positive compression pushes through the bad Gasket and the negative compression pulls through the bad gasket.


    As for checking the intake manifold, run the engine and spray injector cleaner along the intake manifold gasket and see if the engine changes idle or stalls.


    Good luck and keep me posted.

  • Harvey N Tawatao
    Harvey N Tawatao May 29, 2009

    Sounds like a bad intake manifold. You can save some money by going to the Salvage yard and pulling one out of an engine. Remember you have a 12 year old tahoe. Just remove yours first and inspect it to make sure it is cracked and not a really bad gasket leak. 


    If your lucky the yard may even let you have the whole intake, fuel injector system in all. Good luck and keep me posted.

  • Harvey N Tawatao
    Harvey N Tawatao May 30, 2009

    No problem Friend, just do your home work, Like most trucks and after 2005 don't have fuel filter's any more. There built right in with the fuel pump, so when it get's dirty you need to change the whole fuel pump unit.


    Good luck and glad to have helped.

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  • Master
  • 1,486 Answers

Head gasket blown.

Posted on May 28, 2009

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