4.9 engine
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9 engine in Cadillac Engine Technical Discussion; I have a 92 seville the car is 15 years old she's lost a lot of power and she's suck ...
  1. #1
    NellMac4621 is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    4.9 engine

    I have a 92 seville the car is 15 years old she's lost a lot of power and she's suck a lot of gas. I want to know if I get the engine rebuild will it get it solve my problem. Or there's any other methods to go by. also do anyone know whats a good price to go by because I don't want to get rip off.

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  3. #2
    NickySantoro is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldo 4.9 66K miles
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    Nazi Jerky, libtard central
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    Re: 4.9 engine

    How many miles are on the car?

  4. #3
    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
    Automobile(s): 1995 FWB 100,*** miles CURRENT. 1991 Seville 175,000 SOLD
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    Re: 4.9 engine

    4.9s are great and very reliable engines. First figure out what is wrong (must be something very simple) before even thinking of rebuilding. Get the trouble codes.

  5. #4
    92EldoTC's Avatar
    92EldoTC is offline Cadillac Owners Enthusiast
    Automobile(s): Ex:'92 ETC 4.9 Current:'91 Sedan Deville 4.9
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    Re: 4.9 engine

    ^ like he said.

    Pull the codes, it's gotta be something simple.

    4.9's are the most reliable cadillac engine, on average you shouldnt need a rebuild until around between 210k & 250k and thats beating the hell out of it.

  6. #5
    TheeSlowPoke is offline Cadillac Owners Member
    Automobile(s): Cadillac 2000 DTS & 1999 Lexus LS400
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    Re: 4.9 engine

    If you don't have any codes, even if you do, try some of the simple things, like checking spark plug gap, check cleanliness of air filter, and make sure your vacuum lines are not cracked/leaking. After I purchased my used '94, I found the plug gap to be way larger than it was supposed to be. I corrected the gap and saw about a 3 mpg improvement.

    Simple is probably not real fair thing to say about checking the plugs. The back ones are a little difficult, but not impossible, to get out and back in.

  7. #6
    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
    Automobile(s): 1995 FWB 100,*** miles CURRENT. 1991 Seville 175,000 SOLD
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    Re: 4.9 engine

    Oxygen sensors.

  8. #7
    92EldoTC's Avatar
    92EldoTC is offline Cadillac Owners Enthusiast
    Automobile(s): Ex:'92 ETC 4.9 Current:'91 Sedan Deville 4.9
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    Re: 4.9 engine

    Fuel Pressure Regulator

  9. #8
    AA123 is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    Feb 2008
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    1

    Re: 4.9 engine

    Check The Tps

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