newbie need help
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HT4100 4.1, 4.5, 4.9 Discussion, newbie need help in Cadillac Engine Technical Discussion; would appreciate any feedback on the following. i have a 90 seville 4.5 with 65k. the car runs great, good ...
  1. #1
    Foothills Flyer is offline Cadillac Owners Member
    Automobile(s): 90 Cadillac Seville
    Join Date
    Aug 2007
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    newbie need help

    would appreciate any feedback on the following. i have a 90 seville 4.5 with 65k. the car runs great, good acceleration, no missing. recently replaced o2 senser, catalitic converter, plugs,air filter,fuel filter. Now the problem is , on inclines ,going up steep hills. i get poor performance, no missing, just no power,car will hardly do 50 mph. seems to be worse with the a/c on ,will bogg down to 30/40 mph. HELP!!!!!! Thanks.

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  3. #2
    cadillac_tech is offline Cadillac Owners Fanatic
    Automobile(s): 2008 SRX
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    Re: newbie need help

    I would start with a fuel gauge. Connect it to the rail and tape it to the windshield so you can read it while driving up a hill where this happens.

  4. #3
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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    Re: newbie need help

    Agreed, sounds like a fuel issue. Start there.

  5. #4
    Foothills Flyer is offline Cadillac Owners Member
    Automobile(s): 90 Cadillac Seville
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    Thread Starter

    Re: newbie need help

    thanks for the replys i'll pick up a fp gage today, and try it.

  6. #5
    carnut is offline Cadillac Owners Master
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    Re: newbie need help

    Does the transmission downshift at part throttle? if not look to see if the trans cable is disconnected at the throttle body.

  7. #6
    Smoker is offline Cadillac Owners Member
    Automobile(s): 1997 Sedan DeVille
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    Re: newbie need help

    Are you low on gas when that happens? I've learned to never have less than 1/4 tank in my car.

  8. #7
    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: newbie need help

    Did you wire the plugs correctly? Might want to recheck.

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