97 deville trouble code help me
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Northstar Engines and System Technical Discussion Discussion, 97 deville trouble code help me in Cadillac Engine Technical Discussion; my 97 deville keep s throwing a P420 code. I reset it and it goes about 1200 miles or so ...
  1. #1
    fullserviceman is offline Cadillac Owners Fanatic
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    Question 97 deville trouble code help me

    my 97 deville keep s throwing a P420 code. I reset it and it goes about 1200 miles or so then come back. I give it WOT and I get alot of black smoke everytime I hammer on the car. It also feels a bit heavy but that my be because the A/C is on always lately. My Question is How do i know if it is the Catalytic conv. or 1 of the 2 O2 sensors mounted in fron and back of the cat.??? Help me out here because im not inot replacing expensive parts that won't fix the problem.

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  3. #2
    mcowden is offline Cadillac Owners Connoisseur
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    Re: 97 deville trouble code help me

    If one of the sensors is bad, you will get a code for the sensor. If there is no sensor code, I would go with the bad catalytic converter theory. If it's running a little sluggish, the thing is probably getting plugged up and needs replacement.
    Mike

  4. #3
    fullserviceman is offline Cadillac Owners Fanatic
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    Re: 97 deville trouble code help me

    I had the black smoke always during fast acceleration with my 96 caprice LT1 and someone told me the Cat's were plugging up causing more carbon deposits to build up. Then when running ride open it blows out or something like that.. Does this sound possible? I do get a cloud of black smoke if I open the N* up on the highway...

  5. #4
    fullserviceman is offline Cadillac Owners Fanatic
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    Re: 97 deville trouble code help me

    what codes would the sensors be??? anyone???

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 97 deville trouble code help me

    # P0030 - Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 1
    # P0031 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1
    # P0032 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 1
    # P0036 - Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2
    # P0037 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 2
    # P0038 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 2
    # P0050 - Heated Oxygen Sensor (HO2S) Heater Circuit Bank 2 Sensor 1
    # P0051 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 2 Sensor 1
    # P0052 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 1
    # P0053 - HO2S Heater Resistance Bank 1 Sensor 1 (PCM)
    # P0054 - HO2S Heater Resistance Bank 1 Sensor 2 (PCM)
    # P0056 - Heated Oxygen Sensor (HO2S) Heater Circuit Bank 2 Sensor 2
    # P0057 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 2 Sensor 2
    # P0058 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 2
    # P0053 - HO2S Heater Resistance Bank 1 Sensor 1 (PCM)
    # P0054 - HO2S Heater Resistance Bank 1 Sensor 2 (PCM)
    # P0056 - Heated Oxygen Sensor (HO2S) Heater Circuit Bank 2 Sensor 2
    # P0057 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 2 Sensor 2
    # P0058 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 2
    # P0130 - Heated Oxygen Sensor (HO2S) Circuit Closed Loop (CL) Performance Bank 1 Sensor 1
    # P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 1
    # P0132 - Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 1 Sensor 1
    # P0133 - Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 1
    # P0134 - Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1
    # P0135 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 1
    # P0136 - Heated Oxygen Sensor (HO2S) Circuit Bank 1 Sensor 2
    # P0137 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 2
    # P0138 - Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 1 Sensor 2
    # P0139 - Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 2
    # P0140 - Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 2
    # P0141 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 2
    # P0142 - Heated Oxygen Sensor (HO2S) Circuit Bank 1 Sensor 3
    # P0143 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 3
    # P0144 - Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 1 Sensor 3
    # P0145 - Heated Oxygen Sensor (HO2S) Circuit Bank 1 Sensor 2 Slow Response
    # P0146 - Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 3
    # P0147 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 3
    # P0150 - Heated Oxygen Sensor (HO2S) Circuit Closed Loop (CL) Performance Bank 2 Sensor 1
    # P0151 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 2 Sensor 1
    # P0152 - Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 2 Sensor 1
    # P0153 - Heated Oxygen Sensor (HO2S) Slow Response Bank 2 Sensor 1
    # P0154 - Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1
    # P0155 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 2 Sensor 1
    # P0156 - Heated Oxygen Sensor (HO2S) Circuit Bank 2 Sensor 2
    # P0157 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 2 Sensor 2
    # P0158 - Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 2 Sensor 2
    # P0159 - Heated Oxygen Sensor (HO2S) Slow Response Bank 2 Sensor 2
    # P0160 - Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 2
    # P0161 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 2 Sensor 2
    # P0162 - Heated Oxygen Sensor (HO2S) Circuit Bank 2 Sensor 3
    # P0163 - Heated Oxygen Sensor (HO2S) Circuit Bank 2 Sensor 3 Low Voltage
    # P0164 - Heated Oxygen Sensor (HO2S) Circuit Bank 2 Sensor 3 High Voltage
    # P0165 - Heated Oxygen Sensor (HO2S) Circuit Bank 2 Sensor 3 Slow Response
    # P0166 - Heated Oxygen Sensor (HO2S) Circuit Bank 2 Sensor 3 No Activity Detected
    # P0167 - Heated Oxygen Sensor (HO2S) Heater Circuit Bank 2 Sensor 3
    # P1130 - Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 1 Sensor 1
    # P1131 - Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 1 Sensor 2
    # P1132 - Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 2 Sensor 1
    # P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
    # P1134 - Heated Oxygen Sensor (HO2S) Transition Time Ratio Bank 1 Sensor 1
    # P1135 - Heated Oxygen Sensor (HO2S) Lean Mean Bank 1 Sensor 1
    # P1136 - Heated Oxygen Sensor (HO2S) Rich Mean Bank 1 Sensor 1
    # P1137 - Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Lean System or Low Voltage
    # P1138 - Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Rich or High Voltage
    # P1139 - Heated Oxygen Sensor (HO2S) Insuff. Switching Bank 1 Sensor 2
    # P1140 - Heated Oxygen Sensor (HO2S) Transition Time Ratio Bank 1 Sensor 2
    # P1141 - Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2
    # P1143 - Heated Oxygen Sensor (HO2S) Bank 1 Sensor 3 Lean System or Low Voltage
    # P1144 - Heated Oxygen Sensor (HO2S) Bank 1 Sensor 3 Rich or High Voltage
    # P1145 - Heated Oxygen Sensor (HO2S) Cross Counts Bank 1 Sensor 3
    # P1153 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 2 Sensor 1
    # P1154 - Heated Oxygen Sensor (HO2S) Transition Time Ratio Bank 2 Sensor 1
    # P1155 - Heated Oxygen Sensor (HO2S) Lean Mean Bank 2 Sensor 1
    # P1156 - Heated Oxygen Sensor (HO2S) Rich Mean Bank 2 Sensor 1
    # P1157 - Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Lean System or Low Voltage
    # P1158 - Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Rich or High Voltage
    # P1159 - Heated Oxygen Sensor (HO2S) Cross Counts Bank 2 Sensor 2
    # P1161 - Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 2 Sensor 2
    # P1163 - Heated Oxygen Sensor (HO2S) Bank 2 Sensor 3 Lean System or Low Voltage
    # P1164 - Heated Oxygen Sensor (HO2S) Bank 2 Sensor 3 Rich or High Voltage
    # P1165 - Heated Oxygen Sensor (HO2S) Cross Counts Bank 2 Sensor 3

    Check for a leaky injector and/or FPR.

  7. #6
    fullserviceman is offline Cadillac Owners Fanatic
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    Re: 97 deville trouble code help me

    Thanx Ranger this is what i have been looking for

  8. #7
    fullserviceman is offline Cadillac Owners Fanatic
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    Re: 97 deville trouble code help me

    None of these codes show up in the on board just the p420 so I guess its time for an expensive cat. replacement

  9. #8
    CSN
    CSN is offline Cadillac Owners Member
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    Re: 97 deville trouble code help me

    Which bank is #1?

  10. #9
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 97 deville trouble code help me

    Closest to the firewall. Use these for spark plug wire installation: it's important.

    For all the code definitions use the link in the "How to Pull codes" sticky with "obd2" in the URL - that will open a page with the Master Index. Use the blue links to get lists of all P,B,C, and U codes. Bookmark the link.

    "clouds of black smoke" is a fuel/air mixture problem (which will set a cat efficiency code) so do a thorough throttlebody cleaning, air filter checks, fuel pressure regulator checks, MAF and MAP connector checks, ..........eliminate small maintenance problems before spending money ($$$$) on a practically non-existent OEM cat.

    Read the Cadillac Technical Archive ^^^ article "Occasional full throttle operation is good for your engine" and go out on a quiet road and do a few. Also, do this: When clear, put the stick in 2 and begin a slow roll - all clear ?? Punch it - stick your foot through the firewall and leave it there - the car will accelerate to redline and shift to 2. Just before 2-redline, flip your foot off the gas. Let the engine pull the car down to about 20 mph. All clear ??? Slow to 5 mph and do it again. What you're doing is loading the engine to the max, heating up the combustion chambers and piston tops and shedding carbon, while the forced coastdown unloads the pistons and rings, causing the rings to rotate in their grooves, shedding more carbon. (If you miss the 2-redline foot off the gas, not to worry - the transmission will simply shift to 3. It will not let you break anything.)(The stick in 2 merely says "This is my preferred gear". Exceed safe limits and the transmission will shift.)

  11. #10
    skj
    skj is offline Cadillac Owners Member
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    Re: 97 deville trouble code help me

    Just in case anyone searches for that p0420 code, I ran across this:
    P0420 Catalyst System Efficiency Below Threshold (Bank 1)
    (http://www.obd-codes.com/p0420)

    not exactly sure if it's the same but seems like it pertains to it.

  12. #11
    foxjohnc is offline Cadillac Owners Member
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    Re: 97 deville trouble code help me

    Yep, p0420 means catalytic converter is performing below efficiency. The vast majority of the time it is due to a bad/removed/clogged catalyic converter however I have also seen exhaust leaks between engine and cat or a bad rear o2 sensor throw the code. Most of the time a bad sensor will set another code too but not always.

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