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500, 472, 425, 368 Discussion, Engine will not turn back on if hot in Cadillac Engine Technical Discussion; With the distance here, you need to test as many things as possible before sending new parts. Testing an ECU ...
  1. #31
    BRUCE ROE is online now Cadillac Owners Fanatic
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    Re: Engine will not turn back on if hot

    With the distance here, you need to test as many things as possible before sending new parts. Testing an ECU is free, and I could install my replacement MAP for under $100, but round trip shipping could exceed that. Bruce Roe

  2. #32
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    Re: Engine will not turn back on if hot

    Hey Bruce, sorry for the delay, my first daughter is about to come this world, so wife is taking a lot of my time!

    Well, today i had the chance to test both temperatura sensors, and both @ room temperature, are 980ohms, is this correct?

  3. #33
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    Re: Engine will not turn back on if hot

    That is a good value for room temp, they look good. Bruce

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    Re: Engine will not turn back on if hot

    Quote Originally Posted by BRUCE ROE View Post
    That is a good value for room temp, they look good. Bruce
    Well besides the MAP sensor, is there any other problems in the eletronic/sensors, that could be causing this problem?

    Now i think i have to clear the injectors, change their o-rings etc...

    There is 2 solenoids, in the vacuum lines, do you have any idea on how to test them?

    This problem could be connected to the vacuum lines?

    my car is a california car, but some dumb machanic installed the wrong TVS sensor, i already purchased a new one there i will be getting tonight.

    With this new TVS i will be able to leave my vaccum lines exactly as it was when came from the factory.

    Any new ideas?

  5. #35
    BRUCE ROE is online now Cadillac Owners Fanatic
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    Re: Engine will not turn back on if hot

    What is the BENDIX 161 xxxx number on your ECU? Check your MAP voltage.
    Note the 5 pin test connector opposite the connector. It has 3 contacts, a gap cut in the board, and 2 more contacts. The very last contact above is the MAP voltage. With ign on, engine not running, it should read 7 or 7.5V ref to ground. Check your timing chain by lining up your timing mark. With distributor cap off, rock the crankshaft by hand, see how far you must go before the dist rotor starts to turn. 6 degrees means the timing set is completely worn out. Bruce

  6. #36
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    Re: Engine will not turn back on if hot

    Quote Originally Posted by BRUCE ROE View Post
    What is the BENDIX 161 xxxx number on your ECU? Check your MAP voltage.
    Note the 5 pin test connector opposite the connector. It has 3 contacts, a gap cut in the board, and 2 more contacts. The very last contact above is the MAP voltage. With ign on, engine not running, it should read 7 or 7.5V ref to ground. Check your timing chain by lining up your timing mark. With distributor cap off, rock the crankshaft by hand, see how far you must go before the dist rotor starts to turn. 6 degrees means the timing set is completely worn out. Bruce
    o dont have to open the ECU to test it right?

  7. #37
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    Re: Engine will not turn back on if hot

    On a 78 you don't have to open it, just find the test connector opposite end from main connector. That is if you have the ECU I think, what is the BENDIX 161 xxxx number on your ECU? You could also apply vacuum to the ECU, and see that the voltage drops to a couple volts at high vac. Bruce

  8. #38
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    Re: Engine will not turn back on if hot

    i will check the number and voltage.
    I know for sure that it is already remanufacturated... with a blue tag.

    I will take some pics tonight.

  9. #39
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    Re: Engine will not turn back on if hot

    Guys sorry about the lack of updates and info, but my daughter was born on the may 27th, in a few days i will be able to follow thru.



    <a href="http://www.flickr.com/photos/43053041@N08/4656768494/" title="DSC_0796.jpg por Gornati, no Flickr"><img src="http://farm5.static.flickr.com/4043/4656768494_c45965972d_b.jpg" width="680" height="1024" alt="DSC_0796.jpg" /></a>

  10. #40
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: Engine will not turn back on if hot

    Congratuations on your new addition. Have you named her yet?

  11. #41
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    Re: Engine will not turn back on if hot

    Quote Originally Posted by deVille33 View Post
    Congratuations on your new addition. Have you named her yet?

    GIOVANNA GORNATI

    Italian name, as i am italian...

  12. #42
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    Re: Engine will not turn back on if hot

    next week i plan to start messing with the engine, will change the spark plugs, cables, oil, oil filter, air filter, TVS valve, clean injectors, change radiator fluids, check transmition oil, differential and last but not least, fix the vacuum lines.

    after all this if still there is some problems i will mess with the ECU and etc...

    i will keep everybody posted, i am dying to drive this car.

    I will also change the brake booster, i received a re-manufactured one from A1 Cardone.

    i got also the new trunk seal, and my trunk is full of parts, im just waiting for the air filter and oil filter which i purchased off ebay, the only way to receive it in Brasil.

  13. #43
    BRUCE ROE is online now Cadillac Owners Fanatic
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    Re: Engine will not turn back on if hot

    If you remove the injectors, you will need new injector seals. Last original set I checked were completely shot, and a leak will result in a fire. good luck, Bruce Roe

  14. #44
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    Re: Engine will not turn back on if hot

    Quote Originally Posted by BRUCE ROE View Post
    If you remove the injectors, you will need new injector seals. Last original set I checked were completely shot, and a leak will result in a fire. good luck, Bruce Roe
    good thing you remebered about that!!! this is in my wishlist in amazon.com, but unfortunately, amazon will not deliver it in Brasil.

    I will have to wait to some good soul to put one in ebay and ship it to brasil...

  15. #45
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    Re: Engine will not turn back on if hot

    ok bruce, i finally found some time, between the sleeps of my daughter...

    I was able to run some tests, first, engine cold, ignition OFF, the test point measured a drop of -0.02, with the hose disconnected.

    Then ignition ON, engine OFF, hose disconnected, test point showed a value of 1.80, i think my map sensor is bad...

    3rd test, turn the car and disconnected the vacuum hose, no differencee at all on the way the engine runs...

    Tried to press the fast idle valve and yes, the engine runs in a very low idle, but stalls when i step on the gas.

    besides that, everything is the way i told before, starts with a very HIGH IDLE and stalling if i step on the gas pedal...

    If i wait until engine is hot, the idle goes back to "normal" and i am able to drive the car without stalling....

    if the engine is hot and i turn it off, i am not able to urn it back on...


    sorry it took me sooo long to do the tests.



    Quote Originally Posted by BRUCE ROE View Post
    For openers, I would check the 2 EFI temp sensors. Then test the ECU to make sure its delivering the right amount of fuel under all conditions. The MAP sensor in those ECUs often fails. If consequently injector pulse width is reduced, the engine will start on cold enrichment but falter when hot. Swap a spare ECU if you have one. Otherwise, I'll check the ECU for postage. I have a new MAP replacement circuit (no originals available) if its needed. See stuff on Cad 70s EFI on my PHOTOBUCKET

    http://s93.photobucket.com/albums/l71/bcroe/

    (that is a lower case "L"71, not an upper case "i"71)

    click on an Album
    click on a picture to enlarge & description

    Bruce Roe CLC #14630

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