94 Deville 4.9L stalling, acting like it is running out of gas . No codes. - Page 2
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 94 Deville 4.9L stalling, acting like it is running out of gas . No codes. in Past Cadillac Vehicle Discussion; Hall effect provides a signal to the ICM (an thus, the PCM) for the system to time the fuel injection. ...
  1. #16
    drewsdeville is offline Cadillac Owners Master
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Hall effect provides a signal to the ICM (an thus, the PCM) for the system to time the fuel injection. The ignition system's pickup is in the classic location - under the rotor plate, circling the dizzy shaft.

  2. #17
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    When was the last time you cleaned the throttle body and the EGR bores?

    Another possibility might be the torque converter lockup not releasing.

  3. #18
    mluplow is offline Cadillac Owners Member
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    The throttle body and egr have been cleaned. One thing I did do, since the issue seemed to be heat related, was change out the thermostat to a 180 degree. It has not stalled while coming to a stop since but It still sputters while accelerating. I also did check the timing light while it sputtered and it was still getting a spark. I guess I'm at the point where I'll start throwing parts at it. Can a hall effect switch have intermittent problems or will it work or not work? Also, the ISC motor seems to be working. But, it seems like when you let off the accelerator it takes a little time for the rpm's to drop. I guess it is a stepping motor. It goes in and out for sever seconds after cutting the car off. I guess this is normal? I will do a little research on the tc lockup issue.

  4. #19
    the recluse is offline Cadillac Owners Connoisseur
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    The Hall Effect can work intermittently, and when you shut the car off, the ISC is supposed to cycle. The ISC's job is to let the engine "calm down", sorta speak...

    Have you looked into the TPS? It may be out of adjustment or just bad...sputtering on acceleration is one of it's symptoms...

  5. #20
    mluplow is offline Cadillac Owners Member
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    I will check into the TPS. Just got a chance work on this again. One thing it just started happening is a couple of times while stopped the rpm's would go up like your foot is on the accelerator. It still stalls at times.

  6. #21
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Forum newb here, but my wife's 95 4.9L (purchased 1 mo ago) started doing the same thing 2 weeks ago; however, threw a code for a cam shaft sensor. I ordered one from Rockauto for a pretty decent price and am hoping it & a cap/rotor/tune-up do the trick. Until then it's only going on super short trips and then with double foot driving.

  7. #22
    mluplow is offline Cadillac Owners Member
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Well, I just installed a TPS and I still have the same problem. After it reaches operating temp it runs rough and will eventually stall. I watched the ISC moved in and out as it sputtered and stalled. I couldn't tell if was trying to compensate for the low idle when when it tried to stall or if it retracted so much to make it stall. My reaction time is not as good as it used to be. The ISC was definitely moving in and out when it ran rough and stalled. I shut off the ISC motor (retracted) during the installation of the TPS and it looked like there was good 1/8 in gap from the throttle. Is this normal? Still scratching my head.
    Thanks for everyone's help

  8. #23
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    When fully retracted, the gap should be .030".

  9. #24
    It's hers is offline Cadillac Owners Member
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    Check the resistance to your fuel injectors when hot. They should be 16-17 ohms. I've replace a set on a caddy with same symptoms as your car. If one test bad replace all eight. If ok check your PCM grounds at right hand inner fender and also the starter bracket. Good luck


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  10. #25
    mluplow is offline Cadillac Owners Member
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    I will adjust the gap and ohm out the injectors. Is there any way to test the ISC motor? It seems to be working at least most of the time. Is this something that either it works or not?

  11. #26
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    The ISC works if you see it move in and out. Check your injector resistance as it was mentioned already. The resistance needs to be within 12-16 Ohms, not 16-17 as was posted earlier.

    My car did the same thing when it had two injectors completely down and two more half way there. I replaced all of mine with a good set of Bosch injectors.

    Edit: The ISC keeps moving because the computer doesn't see smooth RPMs and so it tries to adjust them through the ISC.

  12. #27
    mluplow is offline Cadillac Owners Member
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Is there an easy way to check resistance on the injectors? Looks like a pain to check them at the injector. I tried to follow the the injector wires to a connector harness so I could check it there. It looks like the harness connector only has 10 wires going to it and it seems like it should have 16. It looked like it was under the brake master cylinder. Maybe this was the wrong connector. I only had a minute to look at it. I had my daughter pop the hood while she was driving by. I sure wish I had a manual. Checked online auction today and not much there. Thanks

  13. #28
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Quote Originally Posted by mluplow View Post
    Is there an easy way to check resistance on the injectors? Looks like a pain to check them at the injector.
    I think that 's the only way. Otherwise you are checking resistance of the injector AND the wires.

    http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40

  14. #29
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    I would be very pissed by now if that was my car and not throwing any codes. I'm wondering if it is the PCM. I agree with ohming out the injectors but if they aren't severely out of spec I think I would rather change a PCM than change injectors. I wish you luck.

  15. #30
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Quote Originally Posted by mluplow View Post
    Is there an easy way to check resistance on the injectors? Looks like a pain to check them at the injector. I tried to follow the the injector wires to a connector harness so I could check it there. It looks like the harness connector only has 10 wires going to it and it seems like it should have 16. It looked like it was under the brake master cylinder. Maybe this was the wrong connector. I only had a minute to look at it. I had my daughter pop the hood while she was driving by. I sure wish I had a manual. Checked online auction today and not much there. Thanks
    This is the harness for the right injector bank. It has 10 wires, because there are 4 injectors on it (each of them have 2 wires), and the coolant temp. sensor is the last pair of wires. Look toward the front of the engine for the left bank injectors. Just to clarify - you found the harness for injector #s 2, 4, 6, 8, and the coolant temperature sensor wires. Now look for the other harness, and that's were you check the resistance - at the harnesses.

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