engine system fault E046
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HT4100 4.1, 4.5, 4.9 Discussion, engine system fault E046 in Cadillac Engine Technical Discussion; my '88 4100 now and then gives me the engine system fault error. the 046 is the code for an ...
  1. #1
    Stealth's Avatar
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    engine system fault E046

    my '88 4100 now and then gives me the engine system fault error.
    the 046 is the code for an imbalance between right and left banks.

    never does it when it is cold. it always happens after driving some,
    and often (but not always) i can shut down the engine, restart it,
    and it goes away. sometimes i drive her 2 miles and it happens,
    sometimes it takes 25 miles, sometimes after a full day of driving.
    there is no telling when.

    sometimes it goes for days w/o the error, then it hits again.
    everytime i try to diagnose, the error goes away before i can get into the diag.
    i could ignore it, but if the error lights up during a SMOG test, they are going to fail it.

    exhaust is clean, no smell at all.

    am i faced with replacing O2 sensors, injectors, wires, plugs, distributor .. blindly?
    can the intake manifold act off and on like this?

    along with the 046, there is another code in the history.
    i think it is 049, will check it in a few mintues.

    any help from those that have lived this in ANY Caddy, ANY model,
    would be appreciated.

    thanks

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  3. #2
    HUF's Avatar
    HUF
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    Re: engine system fault E046

    I can email to you the diagnostics tree for 046 if yu provide me with email address. Oxygen sensors may need replacement probably.

  4. #3
    Stealth's Avatar
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    Re: engine system fault E046

    well, i just went down and checked history. the other code is the e049.
    i believe the 049 is air pump.

    i did one thing i didnt do before.
    i turned on the electronics only.
    did NOT crank or start the engine.

    to my surprise, the E046 shows CURRENT, the 049 shoes history.
    car has been sitting since yesterday.

    how can the E046 show current and engine has not even turned over?
    maybe there lies the answer?

    thanks

  5. #4
    carnut is offline Cadillac Owners Master
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    Re: engine system fault E046

    CURRENT means the fault still exists, HISTORY means the fault no longer exists. If the fault is current it will remain until diagnostics are done and repairs are performed. Then it will still be there but as a history code unless its erased at the time of repair. There are many reasons for this code from poor electrical connections to component failure. A factory service manual is very important to have and follow before parts are thrown at this code. The car running has nothing to do with priority of the codes. Until its fixed the code will remain current.

  6. #5
    HUF's Avatar
    HUF
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    Re: engine system fault E046

    If a code is not set as current during 50 ignition cycles it will be erased by the computer.

  7. #6
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    Re: engine system fault E046

    I have both of those codes and plan to replace my O2 sensors this week...

  8. #7
    carnut is offline Cadillac Owners Master
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    Re: engine system fault E046

    With the factory service manual and the proper diagnostics entered, you can monitor the oxygen sensor switching lean/rich and determine time for replacement.

  9. #8
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    Re: engine system fault E046

    Quote Originally Posted by HUF View Post
    I can email to you the diagnostics tree for 046 if yu provide me with email address. Oxygen sensors may need replacement probably.

    thanks so much for the offer. i do have the tree and i'm replacing the sensors as soon as thy arrive.

  10. #9
    EldoRedo's Avatar
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    Re: engine system fault E046

    Followup: I did get both my O2 sensors replaced and everything is fine -- no codes and no more "rotten egg" smell from the exhaust. BTW I also had a "Service Engine Soon" message before.

  11. #10
    HUF's Avatar
    HUF
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    Re: engine system fault E046

    Quote Originally Posted by EldoRedo View Post
    Followup: I did get both my O2 sensors replaced and everything is fine -- no codes and no more "rotten egg" smell from the exhaust. BTW I also had a "Service Engine Soon" message before.
    Thanks for the followup. How's your fuel economy with new sensors?

  12. #11
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    Re: engine system fault E046

    It has definitely improved -- before it was about 13.5 mpg but now it's closer to 15.1 mpg.

  13. #12
    citizencia is offline Cadillac Owners Member
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    Re: engine system fault E046

    I am having the same issue, I've replaced my injectors with some used ones from a similar year deville (I have a 91 Seville). And that really helped with my original problem of the car running horribly. It turns out that 5 injectors were not working. Can someone email me the diagnostics troubleshooting procedure for this error code?

  14. #13
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    Re: engine system fault E046





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