Low speed stall
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Northstar Engines and System Technical Discussion Discussion, Low speed stall in Cadillac Engine Discussion; I really need some help. My 99 Seville SLS stalls at low speeds, I drive 58 miles to and from ...
  1. #1
    jerry23 is offline Cadillac Owners Member
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    UnhappyLow speed stall

    I really need some help. My 99 Seville SLS stalls at low speeds, I drive
    58 miles to and from work with no issues until I slow down for traffic jam or to get off at my exits. This only happens when I get to a very low speed and not always. I have had the TCC solenoid replaced because I was told that was it. It was OK through the winter, but now that its warming up a bit, it stalls regularly at low speeds. The only code I can get from the display is a 1599 code (stall condition)


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Low speed stall

    Try cleaning the TB and the EGR valve, even though the EGR should set a code if it was sticking open.

  4. #3
    jerry23 is offline Cadillac Owners Member
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    Re: Low speed stall

    Thanks Ranger, I tried both of those things. The throttle body was all gummed up and the EGR was clean. I have read many posts and thought about replacing the Crank Position Sensors even though I don't get any related codes. Do you think that might be it?

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  6. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Low speed stall

    CKP sensors do not always set a DTC. '99's where not part of the bad batch, but your symptoms do match. It would be a shot in the dark.

  7. #5
    jerry23 is offline Cadillac Owners Member
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    Re: Low speed stall

    I'll give it a shot and let you know if it helps. If anyone has any other ideas I would appreciate it. This is very frustrating and dangerous.

  8. #6
    jerry23 is offline Cadillac Owners Member
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    Re: Low speed stall

    I haven't replaced the CKP sensors yet but I did remove the IAC valve to look at it and it was full of carbon deposits. It idles smoother now and has not stalled until today. I got off at an exit going from 70 down to around 35 slowly. I noticed at one point while slowing down the tach suddenly dropped until I gave it gas and it recovered before stalling. Could this be related to the speed sensor on top of the tranny? Ranger or Sub are you out there?

  9. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Low speed stall

    That would be the VSS. Not sure what happens when that fails, but it should set a DTC.

  10. #8
    jerry23 is offline Cadillac Owners Member
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    Re: Low speed stall

    Ranger no codes have been set. This is becoming a dangerous situation. Any other thoughts?

  11. #9
    Ranger's Avatar
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    Re: Low speed stall

    Other than wild guesses, I'm out of ideas.

  12. #10
    2009chopper is offline Cadillac Owners Member
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    Re: Low speed stall

    i think ranger is right....i had the same thing happen on my 2000 dts. i would pull up to a light and it would stall, took it in and it was the crank sensor. they replaced it and it worked great after that.

  13. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Low speed stall

    A TCC clutch not disengaging would stall the engine as well. Just like trying to stop a standard transmission car without stepping on the clutch. That said, it should set a DTC (P0742 I think).

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