1994 deville 4.9
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HT4100 4.1, 4.5, 4.9 Discussion, 1994 deville 4.9 in Cadillac Engine Technical Discussion; when I hit the gas soft it runs good. when I hit the gas hard the engin stall out and ...
  1. #1
    ahmad is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    Unhappy 1994 deville 4.9

    when I hit the gas soft it runs good. when I hit the gas hard the engin stall out and wont pick up speed. tried new o2's,fule filter. the only codes popin up is I039. I done tried all most everything:

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  3. #2
    NickySantoro is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldo 4.9 66K miles
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    Re: 1994 deville 4.9

    Are the plugs, cap, wires, and rotor due for replacement?

  4. #3
    ahmad is offline Cadillac Owners Member
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    Talking Re: 1994 deville 4.9

    yes just had full tune-up

  5. #4
    NickySantoro is offline Cadillac Owners Fanatic
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    Re: 1994 deville 4.9

    Did this start after the tune-up? Are you getting any pinging?

  6. #5
    ahmad is offline Cadillac Owners Member
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    Re: 1994 deville 4.9

    well i guess after, because i took the mortor out of my 92 sts 4.9, that ran fine. did full tune-up then. what is pinging sorry. do u think its an computer problem

  7. #6
    NickySantoro is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldo 4.9 66K miles
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    Re: 1994 deville 4.9

    Have you checked the timing? Too much advance and it will bog.

  8. #7
    ahmad is offline Cadillac Owners Member
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    Re: 1994 deville 4.9

    timing good

  9. #8
    NickySantoro is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldo 4.9 66K miles
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    Re: 1994 deville 4.9

    Have you carefully checked for vacuum leaks? The vac lines on a 13 year old car are bound to be brittle and/or loose. BTDT.

  10. #9
    frizz3333 is offline Cadillac Owners Member
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    Re: 1994 deville 4.9

    On my 1992 Im running the same code and the service engine soon light will come on and the car when i give it gas seems gut less IO39 Is Loss of RoadSensing suspension Data

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