06 DTS hard to start when stone cold - Page 2
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Cadillac DTS Forum - 2006 through 2012 Discussion, 06 DTS hard to start when stone cold in Past Cadillac Vehicle Discussion; WOW! Fuel pressure increased on these models. I wonder how (if) that's gonna affect fuel pump longevity....
  1. #16
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 06 DTS hard to start when stone cold

    WOW! Fuel pressure increased on these models. I wonder how (if) that's gonna affect fuel pump longevity.

  2. #17
    Andrew224's Avatar
    Andrew224 is offline Cadillac Owners Fanatic
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    Re: 06 DTS hard to start when stone cold

    I'd check your battery's condition before anything else.

  3. #18
    Atavar is offline Cadillac Owners Fanatic
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    Re: 06 DTS hard to start when stone cold

    If the problem is that it cranks too long I doubt the battery is the issue.

  4. #19
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    Re: 06 DTS hard to start when stone cold

    The increased draw of amps to the starter might not leave enough juice to fire the plugs the way they need to in order to ignite the fuel.

  5. #20
    mike5514 is offline Cadillac Owners Enthusiast
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    Re: 06 DTS hard to start when stone cold

    Temps below zero will do all sorts of things to a car/engine I would change the oil a lighter dino or a synthetic if you like also do a starter draw check very easy you might be able to get a parts store to do it or buy the tester at harbor freight. Mike

  6. #21
    Genn15 is offline Cadillac Owners Member
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    Re: 06 DTS hard to start when stone cold

    Thanks for the help guys after cleaning the tb and checking pressure which they said was correct I haven't had any issues, and blocking the throttle plate open saved me a lot of time thank god haha. I'm not sure if I'll still have the issue when it gets really cold or not it hasn't dropped below -5 since but fingers crossed I won't have any trouble!
    Tom's Caddy likes this.

  7. #22
    LittleNo is offline Cadillac Owners Fanatic
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    Re: 06 DTS hard to start when stone cold

    Even a returnless Fuel Supply System can have issues with the Fuel Pressure or Air in the Fuel Rails. This can be caused by one or more injectors not fully closing (in normal operating Situations you won't have any Problems due to this, but when the car sits long enough you have air in the Fuel Rail which must be bleeded before the engine gets fuel). If or when a bad injector is not fully closing can depend on the position in which the engine stopped before. That explains why you have the problem one day and the other not. What I personally have seen on some Northstars is that the issue mostly appears when you start the car at a much lower temp as you parked it. So it's not the cold itself, when you park at freezing and start again at the same temp, everything is fine. But when you have a larger temp drop over the night, the Problem is there.

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