Question about 2000 Chevrolet Tahoe

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Falling on its face...

Hi,
Got a 2000 1/2 Z-71 tahoe with a 5.7L. When its got a cold engine i will start it up and give it some gas and it falls on its face. I was thinking maybe a vacuum leak cause it will get warm then close its self off. Don't know just lookin for some answers! Thanks

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  • 7 more comments 
  • sanger1312 Jul 29, 2009

    Fuel pressure is in spec. I changed my fuel filter about a month ago along with new distributor,cap,rotor,plugs and wires. (The last owner must have done head gaskets and royally screwed over the old distributor! he put the long bolt on the rotor and dug out a hole on the hall effect switch!!)

  • sanger1312 Jul 30, 2009

    Nope, no light. Have checked it with a scan tool many times. Everything is running to spec. If it was a coil pack or injector, it would do it all the time though right? Im just leaning towards intake/head gaskets.

  • sanger1312 Aug 03, 2009

    Yeah, when it warms up its fine. I actually did the distributor and everthing myself so im 90% sure its ok.(But ya never know!) Ya i guess im kinda at a loss of words on it. A new hall effect came with dist.

  • sanger1312 Aug 04, 2009

    Yeah, my e-mail is sanger1312@yahoo.com
    Its a throttle body, they have chokes? Yeah just let me know what you find out!

    You have been alot of help! Thanks!

  • sanger1312 Aug 06, 2009

    Now that you said about my temp sending unit, my temp gauge doesn't get to 195. I put a scan tool on it and it reads about 173-178...I replaced the thermostat about four times now. so maybe thats where the prob. is?

  • sanger1312 Aug 06, 2009

    Now that you said about my temp sending unit, my temp gauge doesn't get to 195. I put a scan tool on it and it reads about 173-178...I replaced the thermostat about four times now. so maybe thats where the prob. is?

  • sanger1312 Aug 07, 2009

    It only comes up to that number. But yeah that would make sense, Is there a way i can find out the temp of the engine around the sending unit? I have a fluke meter that has a temp. sensor on it would that work?

  • sanger1312 Aug 18, 2009

    no not yet, i haven't had a chance to work on it yet...I'll let you know

  • sanger1312 Aug 24, 2009

    ok, update!



    Was driving out to my lake cabin pulling my boat when i looked down and noticed that my coolant temp gauge was (on regular vehicals, just under 210 mark) was were it should be, well seconds after that my check engine came on. So i pulled over and let her cool down then disconnected my battery to clear that code. Now its back to where it has always been, around the 170ish area....WHAT HAPPEND?!! still havent bought a new sensor, was on vacation.

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  • Master
  • 631 Answers

Need to check fuel pump pressure. Have you changed the fuel filter? New plugs?

Posted on Jul 28, 2009

  • 11 more comments 
  • outdoorsman5
    outdoorsman5 Jul 29, 2009

    Is the service engine soon light on? It could many things causing hesitation. Could be bad coil pack, bad injector, Knock sensor, Throttle position sensor, Crank shaft position sensor although most of these will generally set a code if the computer detects something isn't right. There are many things that could cause this type of problem.

  • outdoorsman5
    outdoorsman5 Jul 30, 2009

    Oh when you said it will close itself off you meant that when it warms up it will not fall on its face, is that correct? And yes if it were coil packs, or bad injector it would do it all the time or should. It could be the intake gaskets or head gaskets but I really don't think so. If there are not codes set then it either has to be meachanical or electrical other then sensors because it would have thrown a code otherwise. Are you sure he got the distributor all back together right and was the Hall Effect Switch changed?

  • outdoorsman5
    outdoorsman5 Aug 03, 2009

    I am looking on some of my other programs to see if it gives any other idea's of what the problem could be. Are you sure that when it is cold that the auto choke isn't feeding to much gas in and when you give it more it will cut out?

  • outdoorsman5
    outdoorsman5 Aug 03, 2009

    If you will contact give me your email or if you have a yahoo Messenger ID, I have some other things you can check. I did some looking on my repair programs I have on my work computer and found some other things for you to look based upon your particular problem.

  • outdoorsman5
    outdoorsman5 Aug 04, 2009

    I sent you all the other check info in your email. Also your voltage for your TPS should be .51 for your particular engine. I explained in your email how to check your TPS. Please let me know if you need more info.

  • outdoorsman5
    outdoorsman5 Aug 04, 2009

    Also you don't have a choke on throttle body but your coolant sending unit controls by temperature how much your engine gets as far as fuel by sending temperature readings to your computer. It sends proper amount of fuel when it is cold to keep it running and then leans out as it warms up.



  • outdoorsman5
    outdoorsman5 Aug 04, 2009

    If you check your TPS voltage and it isn't withing specifications of .51 for your voltage your throttle body may need cleaning, or your TPS is faulty.

  • outdoorsman5
    outdoorsman5 Aug 06, 2009

    Yes could be because your computer is based off of what your sensors are telling it to do. With your Temperature sensor it controls the amount of fuel your engine is getting based on temperature. I remember one day taking short cuts and not checking the most obvious which was the temperature sender and that is what it was all the time. It would run great when it was cold but when it warmed up it wouldn't run at all because the temperature sendor was sending the info that the engine was cold all the time and the computers was choking the engine out. So yes it could a possibility that is the problem. Does it read that temperature all the time when you turn your engine on? or does it only go up to the temperature and no more?

  • outdoorsman5
    outdoorsman5 Aug 07, 2009

    You could use your fluke and take the water temperature and see if it corresponds with your gauge but it might be just a little cooler out of the radiator.


  • outdoorsman5
    outdoorsman5 Aug 07, 2009

    If you take it to a parts store such as Checkers (C&K Commercial) or Auto Zone or one of the other ones they will hook it for free to their hand held computer. I am not sure how well some of them are trained but if they look at the computer and can see the temperatures, the IAT (intake air temperature) and the ECT (Engine coolant Temperature) should read about the same.

  • outdoorsman5
    outdoorsman5 Aug 07, 2009

    When you read the temperature with the scan tool was the temperature you got at a 173-178 when it was fully warmed up? Did it ever go up higher then that? What did the temperature read when you initially looked at your scan tool when it was cold? Should read close to Ambient temperature.

  • outdoorsman5
    outdoorsman5 Aug 18, 2009

    Did you ever get your problem resolved?

  • outdoorsman5
    outdoorsman5 Aug 24, 2009

    Remember when I posted one of my first responses to your Problem back on Aug 7? I believe that your problem was with your temperature sending unit. I still think there is a problem there and needs to be changed. This will dramatically change how much fuel your engine gets and how it runs because of incorrect temperature readings that your computer receives. I am not ruling out ECM but would lean towards the temperature sender being bad.

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