Slow start and stalling

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Northstar Engines and System Technical Discussion Discussion, Slow start and stalling in Cadillac Engine Discussion; 97 deville deelegance 100,000mi, Service light on, extended crank time to start in the cold, rough idle for about a ...
  1. #1
    juice881998 is offline Cadillac Owners Member
    Automobile(s): 97 Deville Delegence
    Join Date
    Jun 2009
    Greeley, CO

    Question Slow start and stalling

    97 deville deelegance 100,000mi, Service light on, extended crank time to start in the cold, rough idle for about a minute, really cold this week in CO and engine stalled two seperate times in same trip when coming to a stop (engine had already been running about 40min), put in N and starts right away. Pulled codes: pcm p0101-current, 0131-history, 0171-h, 0174-h, 0603-h, 1520-h, 1527-h, 1599-h; read many threads here about these codes and problems and realized that I needed to take it in. I talked with the service rep and explained all that had gone on and gave them the codes and a list of things (that I learned here) I thought needed to be done or checked, like clean MAF & TB, check crank sensors & fuel pressure reg & fuel psi & fuel rail etc.. I even said that maybe they could see if the HG is blown, I tried to be polite and not tell them how to do their job, I was just trying to help, anyway, that afternoon they told me that they pulled codes and saw that there were a lot and recommended replacing the MAF sensor and all three O2 sensors and clearing the codes to see if that would fix it, I asked if the fuel pressure was checked and the service rep wasn't sure; So I have two questions:
    1-I brought it to a shop to get diagnosed, not to throw parts at it; do I need to go to a different shop?
    2-based on my simptoms and codes, what are your thoughts?
    Thanks, Juice
    Background info: new fuel filter Jan 09, new spark plugs Jul 09.

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  3. #2
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 Eldorado, and a 99 ETC
    Join Date
    Sep 2004
    Hilo, Hawaii

    Re: Slow start and stalling

    P0101 - Mass Air Flow (MAF) Sensor Performance
    P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 1
    P0171 - Fuel Trim System Lean Bank 1
    P0174 - Fuel Trim System Lean Bank 2
    P0603 - Control Module Long Term Memory Reset
    P1520 - Transmission Range Switch Circuit
    P1527 - Transmission Range to Pressure Switch Correlation
    P1599 - Engine Stall or Near Stall Detected

    Hmmm... I would start with troubleshooting the MAF. The O2 sensors are seeing too much oxygen in the exhaust so they think that there wasn't enough fuel added to burn it. That's why they think it has a lean condition. The causes would either be low fuel pressure, a vacuum leak or a sensor such as the MAF is not working efficiently. I would check for vacuum leaks first. Maybe that extra oxygen is getting in there after the sensor. The chart for P0101 says to especially check the MAF sensor seal, throttle body spacer, intake manifold, EGR valve plate and tubes, PCV system and the brake booster and hoses. I think that's pretty much all the places that a vacuum leak can occur. If there aren't any vacuum leaks and the fuel pressure is good, I would be willing to say that the MAF is probably bad.

    You may have 1 O2 sensor going bad judging by the low voltage code, but I would just take it one step at a time.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Slow start and stalling

    Don't overlook the manifold overpressurization valve behind the P/S pump for a vacuum leak.

  5. #4
    juice881998 is offline Cadillac Owners Member
    Automobile(s): 97 Deville Delegence
    Join Date
    Jun 2009
    Greeley, CO
    Thread Starter

    Re: Slow start and stalling

    So I told the shop to just clean the MAF and check for vacuum leaks. They cleaned the MAF and didn't check for leaks but the service light is off and it seems to be running fine, although it is a lot warmer this week. Cross your fingers that it just needed a good cleaning. Thanks for your input. =)

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