1999 STS - long crank, hard start, dies

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Cadillac Seville / Cadillac Eldorado Forum Discussion, 1999 STS - long crank, hard start, dies in Past Cadillac Vehicle Discussion; Hi caddy people, i got a question and hope i can get the help i need here. My 1999 sts ...
  1. #1
    eltoro1 is offline Cadillac Owners Member
    Automobile(s): sts
    Join Date
    Apr 2012

    1999 STS - long crank, hard start, dies

    Hi caddy people, i got a question and hope i can get the help i need here. My 1999 sts sometimes won't start and just cranks for like a minute and than all the sudden starts right away. When it starts it drives like new but sometimes while I'm driving, it shuts off but the lights and everything stays on. I'll go and try to start it up and it starts up right away, do you think its an electrical problem, alarm problem or what do you think??? Thank you so much for your help

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.

    Have you checked for fuel and spark when it fails to start?

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, install big wheels !
    Automobile(s): 2002.5 F55 STS, 2014 Explorer XLT 4WD
    Join Date
    Feb 2006
    MD Eastern Shore

    Re: wont start/die problem

    Use the car's built in code reader/scanner to get any trouble codes. Study the OBD-II section of the sticky post ^^^ "How to pull codes". Practice, write down all codes, whether each is Current or History, then return to the sticky to open the "obd2" link which takes you to a Master Index of all P,B,C, and U codes. Write down the definitions of your found codes and post it all here.

  5. #4
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
    Automobile(s): '02 ETC ECS#533, '05 Escalade, '05 AWD Magnum, '74 455 OLDS
    Join Date
    Feb 2012

    Re: wont start/die problem

    A bad fuel pressure will make it hard to start first thing in the morning after the intake floods overnight but I don't think it would make it stall. Crank sensor could do it. There are two and there should be a code.

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