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HT4100 4.1, 4.5, 4.9 Discussion, lost of power in Cadillac Engine Technical Discussion; Lower than normal voltage and hard power steering sounds like it's idling low....
  1. #16
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: lost of power

    Lower than normal voltage and hard power steering sounds like it's idling low.

  2. #17
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    Re: lost of power

    Check your codes - not all of them turn on a light.

    Fuel pressure: Engine running: 34-38psi. Engine off, key on: 40 or above.

    Whats the lowest voltage you've seen? Turn off every unneccesary accessory including the ac and have a look. If its not below 13 its fine.

    See what the engine rpm is when idling in DRIVE. It should be between 600 and 675. Watch the rpm as you turn the wheel.

  3. #18
    steelybill is offline Cadillac Owners Enthusiast
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    Re: lost of power

    This may be a long shot, then again maybe not, but some of the items suggest a catalytic converter restriction. The "quiet" engine is one of them, and loss of power while running somewhat decent also suggests it. You might listen at the tail pipe for normal (or abnormal) exhaust note or output.

  4. #19
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: lost of power

    I think that's a good call steelybill, after reading through the thread again it does sound like a clogged catalytic. It's quieter than normal, takes more pedal pressure to get up to speed, lousy mileage, check the vacuum with a vacuum gauge. If the cat is clogged the vacuum should be way down.

  5. #20
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    Re: lost of power

    Good thought. I forgot all about that. Worth checking into.

  6. #21
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    Re: lost of power

    It might because I have to give more effort than usual Togo up hills and drive ways .the lowest voltage ive seen is 13.6 . When I took it to the shop they replaced my egr and 3wks later the shop cleaned the carbon build up and in a couple weeks voltage is down and steering stiffness and lost of power

  7. #22
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    Re: lost of power

    Voltage is NOT down. Forget about voltage, you dont have a charging problem. 13.6v is fine and dandy. When the alt is cold it puts out more voltage which is totally normal.

    I agree that the converter is worth looking into. A crude way of checking it is to remove the o2 sensors and see if your problem improves. The holes in the pipes where the sensors were will release the back pressure.

    It's also possible that the ISC motor has died and is not keeping the idle up where it should be but it will not affect your gas mileage because that part only influences the engine at idle and coastdown.

  8. #23
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    Re: lost of power

    How do you test the ics motor and where is it. I heard if u take off the o sensor wrong u can break it

  9. #24
    steelybill is offline Cadillac Owners Enthusiast
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    Re: lost of power

    I believe the 02 sensor is in the rear manifold, (just ahead of the firewall) and kind of tough to get at on a FWD (mine was). Did you listen at the tail pipe ? If the cat is plugged, just a whisper of exhaust and noise will be coming out there.
    You may have to have a muffler shop look at it if you don't have the tools to deal with exhaust systems.
    The vacuum gauge test will also tell.

  10. #25
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    Re: lost of power

    Yea I know where the o2 sensor is. The exhaust sounded the same and I didn't hear any rattling in c converter. I'm at the shop now let's hope I leave with both of my kidneys and liver lol.

  11. #26
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    Re: lost of power

    Here's the results bad cata c and fuel filter.

  12. #27
    steelybill is offline Cadillac Owners Enthusiast
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    Re: lost of power

    So, is it running alright now ?? Fuel filter should be changed every few years, to know it's not a problem.

  13. #28
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    Re: lost of power

    Yea it runs better but off and on I noticed the headlights dim up and down twice then it runs fine. Out the door came to 484.80 ouch

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