oil pressure light 4.9 liter
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  • 2 Post By dennis93coupe
HT4100 4.1, 4.5, 4.9 Discussion, oil pressure light 4.9 liter in Cadillac Engine Technical Discussion; My 93 deville has been started every blue moon for the past four year while in a paint shop. Recently ...
  1. #1
    cadikeith81 is offline Cadillac Owners Member
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    oil pressure light 4.9 liter

    My 93 deville has been started every blue moon for the past four year while in a paint shop. Recently I have got the car back and changed the wires platinum plugs, battery, alternator, starter, pull down trunk motor, struts all around and oil with synthetic. After all that money spent plus 5700 in paint and body work the oil light stays in when the car is off. I was told my motor is locking up. Please guys help me on this one!

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: oil pressure light 4.9 liter

    Motor locking up because the light stays on WHEN THE MOTOR IS OFF? Ridiculous! Sounds more like an electrical problem.

  4. #3
    cadikeith81 is offline Cadillac Owners Member
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    Well the mechanic went behind the passenger wheel and tried to turn one if the pulleys on the motor and said there is too much tension. Although I had him to come over to find the electrical problem because the car dies out after about ten minutes running. Could it just be the electrical problem is it?

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: oil pressure light 4.9 liter

    Too much tension? He's turning the crankshaft by hand and thus trying to compress the air in the cylinders by hand (unless he had all 8 plugs removed). If the engine was "locking up" I doubt it would be running now. Might want to look for another "mechanic". My money is on a failed oil pressure switch or maybe a short or open in the circuit somewhere. Remember, the oil pressure light alerts you when the oil pressure is low. There is no oil pressure when the engine is off and should be no current to the switch when the ignition is off. Now key (ignition) ON, engine OFF (aka KOEO) is another story. In that configuration you have current to the switch, but no oil pressure so the light should be on.

  6. #5
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: oil pressure light 4.9 liter

    Does the oil light go out when you take the key out? I think one of my cars did that when the horn relay blew. just my .02

  7. #6
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: oil pressure light 4.9 liter

    Buy a cheap mechanical oil pressure gauge from harbor freight and put the adapter in place of the oil pressure switch. Run engine and observe. 35psi+ at 2000 rpm =

  8. #7
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: oil pressure light 4.9 liter

    I know this is a dumb question but you never know. Does it have oil in it? Check the dipstick?
    Sevillian273 and Sevillian273 like this.

  9. #8
    cadikeith81 is offline Cadillac Owners Member
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    Thanks a lot cadi lovers. Oil pressure switch has been replace and the light has gone off. Love you people!

  10. #9
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: oil pressure light 4.9 liter

    Well that was easy!


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