Help ???
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Help ??? in Past Cadillac Vehicle Discussion; very hard cold start & runs rough after warming up I cleaned TB (lots of carbon) replaced plugs Temp is ...
  1. #1
    richrich is offline Cadillac Owners Member
    Automobile(s): 97 Deville
    Join Date
    Apr 2009
    Posts
    1

    Help ???

    very hard cold start & runs rough after warming up
    I cleaned TB (lots of carbon)
    replaced plugs
    Temp is fine
    at times I have to pull back on accelerator to get moving
    stalling
    here are the codes (I cleared then drove 60 miles)
    P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 1
    P0151 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 2 Sensor 1
    P0171 - Fuel Trim System Lean Bank 1
    P0174 - Fuel Trim System Lean Bank 2
    P0300 - Engine Misfire Detected
    P1599 - Engine Stall or Near Stall Detected

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  3. #2
    chubbyranger is offline Cadillac Owners Connoisseur
    Automobile(s): 99 Seville STS, 08 STS4 N* 1SG F55
    Join Date
    Apr 2007
    Location
    The Ocean State
    Age
    50
    Posts
    3,516

    Re: Help ???

    Check the fuel pressure regulator. Pull the vacuum line and check for gas. Gas present = bad FPR. Also seems like your O2 sensors may be toast but they rarely fail simultaneously. I'd also inspect the EGR valve as that may have carbon buildup on the pintle.

  4. #3
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    70,504

    Re: Help ???

    P0171 - Fuel Trim System Lean Bank 1
    P0174 - Fuel Trim System Lean Bank 2
    Check for a vacuum leak.

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