Engine stopped at the end of an exit ramp Any IDEAS WHY?
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Northstar Engines and System Technical Discussion Discussion, Engine stopped at the end of an exit ramp Any IDEAS WHY? in Cadillac Engine Technical Discussion; 1999 Deville I just purchased with 119,000 miles. Gave it a good performance test before I bought it, doesn't overheat ...
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    bighank is offline Cadillac Owners Member
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    Engine stopped at the end of an exit ramp Any IDEAS WHY?

    1999 Deville I just purchased with 119,000 miles. Gave it a good performance test before I bought it, doesn't overheat and shifts OK. Was driving on Saturday and just exited a limited access road and came to the bottom of the ramp. As I made a right turn onto the intersecting highway I felt the power steering get very stiff. I realized the motor had stopped. Coasted at about 20 MPH and was almost stopped when I put the transmission in Neutral and turned the ignition key to restart the engine. It started immediately. When I checked the DTC codes I found a (I THINK, don't remember if this is right) P5099 code which says the engine stalled or almost stalled. GREAT I KNEW THAT.

    Other DTCs were present before. P5020 and P5027 I believe related to the transmission indicators not agreeing with the display. These were there before.

    Now I'm afraid of the car stalling and dying somewhere far from home.

    Any suggestions as to the cause of this problem? BIGHANK

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Engine stopped at the end of an exit ramp Any IDEAS WHY?

    Eventually codes P 0335/6 and/or P0385/6 will set, indicating CKP A or B. Crankshaft Position Sensors. Do a search in the top bar search function.

    Not a difficult DIY, but you need a lift and patience. Do them both due to newer parts manufacturer.

    Both sensors total $85, www.rockauto.com or www.gmpartsdirect.com.

    LOTS of posts about this common problem.

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    Crown Vic Owner is offline Cadillac Owners Connoisseur
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    Re: Engine stopped at the end of an exit ramp Any IDEAS WHY?

    if the CKP starts to do this, can the car be limped home?

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    Re: Engine stopped at the end of an exit ramp Any IDEAS WHY?

    Yes. CKP failures generally cause an engine stall, but then can be restarted with no problem. Most CKP failures are 2000 - 2003 due to a bad supplier. GM switched suppliers in early '03 to the best of my knowledge. BigHank has a '99, so not sure if that is his problem or not. Especially without a CKP code.

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    bighank is offline Cadillac Owners Member
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    Unhappy Re: Engine stopped at the end of an exit ramp Any IDEAS WHY?

    Quote Originally Posted by bighank View Post
    1999 Deville I just purchased with 119,000 miles. Gave it a good performance test before I bought it, doesn't overheat and shifts OK. Was driving on Saturday and just exited a limited access road and came to the bottom of the ramp. As I made a right turn onto the intersecting highway I felt the power steering get very stiff. I realized the motor had stopped. Coasted at about 20 MPH and was almost stopped when I put the transmission in Neutral and turned the ignition key to restart the engine. It started immediately. When I checked the DTC codes I found a (I THINK, don't remember if this is right) P5099 code which says the engine stalled or almost stalled. GREAT I KNEW THAT.

    Other DTCs were present before. P5020 and P5027 I believe related to the transmission indicators not agreeing with the display. These were there before.

    Now I'm afraid of the car stalling and dying somewhere far from home.

    Any suggestions as to the cause of this problem? BIGHANK
    Actual DTC codes set are P1520 P1527 and P1599. No CKP codes so far.
    Have both the GM factory manuals and the Haynes manual. Saw the write up in the Haynes manual on replacing the CPS. Is this a tough job? Is the CKP accessable without disassembling a lot of things on the engine. Does anything have to be reset or reprogrammed after replacing the CKP sensor? If the CKP sensor goes out altogether will I not be able to restart the car?

    If NOT the CKP sensor what other items would you suspect? Just slowed down from hard acceleration about 20 seconds before coasting down the exit ramp. Would anything related to deceleration cause something like this?

    BIGHANK

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    Re: Engine stopped at the end of an exit ramp Any IDEAS WHY?

    As far as I know in some cases CKP sensors don't set a faulty code so you meditate why your car stalls despite not having a CKP code but your CKPs are shot despite that

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    bighank is offline Cadillac Owners Member
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    Re: Engine stopped at the end of an exit ramp Any IDEAS WHY?

    Someone suggested a dirty throttle body or out of adjustment TPS. What are your views on this. How do you reset, repair, replace a TPS. I have cleaned throttle bodys and MAF sensors before but haven't delt with the CPS or TPS. BIGHANK

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    Ranger's Avatar
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    Re: Engine stopped at the end of an exit ramp Any IDEAS WHY?

    TPS is mounted on the TB opposite the throttle linkage and in line with the throttle plate shaft.

    CKP sensors are above the oil filter adapter (which needs to be removed). I think there may be a tutorial in the Tech Tips section.

    Clean the TB first. You may have a carboned up IAC valve or IAC circuit.

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