Serevice engine soon
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HT4100 4.1, 4.5, 4.9 Discussion, Serevice engine soon in Cadillac Engine Technical Discussion; I have a 92 coupe deville 4.9 of course. I just had my oil changed at a quick change joint, ...
  1. #1
    CadillacDonn is offline Cadillac Owners Member
    Automobile(s): '92 coupe deville
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    Question Serevice engine soon

    I have a 92 coupe deville 4.9 of course. I just had my oil changed at a quick change joint, and a new pcv valve put on the next morning when i was driving to work my service engine soon light came on. why do you thionk it was triggered. to much oil. havent ran codes yet havent had time busy with my son. any suggestions ideas will be appreciated.

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  3. #2
    CadillacDonn is offline Cadillac Owners Member
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    Thread Starter

    Re: Serevice engine soon

    Sorry about ther typos was posting and giving son bath.

  4. #3
    noahsdad's Avatar
    noahsdad is offline Cadillac Owners Connoisseur
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    Re: Serevice engine soon

    SES is typically the result of a code being set. Best to start there.

  5. #4
    CadillacDonn is offline Cadillac Owners Member
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    Re: Serevice engine soon

    I ran the obd and got about 5 codes. I didnt know if they were old and had been resolved or if it was a fluke, so i cleared the codes then drove about thirty miles and ran the obd again. I was given the e055 code which is throttle out of range does this mean im getting to little or to much gas or does it mean that my throttle body is out of whack? aand how can i resolve this issue?

  6. #5
    Po Pimp is offline Cadillac Owners Fanatic
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    Re: Serevice engine soon

    I would start with cleaning your throttle body. You could have sucked some crud up in there assuming your PVC valve was clogged before. A dirty throttle body could set this code. The angle of the throttle plate and the rpms have a margin of error but for the most part go hand in hand. The computer realizes when they are not correct and flips a code. If the cleaning does not solve the problem I would adjust the TPS. You are probably running a little rich right now.

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