Flat spot and bogging down
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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, Flat spot and bogging down in Cadillac SRX Forums; 2004 SRX N* AWD I have a flat spot at partial throttle when cruising at speed. It only seems to ...
  1. #1
    Mr. Mohr's Avatar
    Mr. Mohr is offline Cadillac Owners Member
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    Flat spot and bogging down

    2004 SRX N* AWD
    I have a flat spot at partial throttle when cruising at speed. It only seems to happen once I'm at speed and am just driving with my big toe to keep it at speed or slightly accelerate. When it happens, there is a slight RPM drop and an audibly lower exhaust note. I can almost exactly replicate this if I am driving slow (35mph) in 5th (sport-manual) and try to accelerate, only difference is I have to give it more throttle to bog down when I do this (1/2 throttle or more), unlike when it normally bogs down it's always at slight (maybe 1/4 or less) throttle. No check engine light. Octane rating doesn't change this either. Any ideas? I have an upcoming trip and would like to try and fix this before I go if it's something repareable.

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    Mr. Mohr's Avatar
    Mr. Mohr is offline Cadillac Owners Member
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    No? Nothing? No ideas at all?

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    MoistCabbage's Avatar
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    First step would be to have your codes pulled.

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    glake89's Avatar
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    Re: Flat spot and bogging down

    Sounds like pedal PS is out of sync with TB driver. Might want to double check connectors involved. Probably not serious if you can live with it. TB (throttle body) may need cleaning.
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    Mr. Mohr's Avatar
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    Re: Flat spot and bogging down

    There are no codes, at least no CEL. Are there codes that don't through a CEL? I seem to remember hearing about that once. Anyways, I will try and clean my TB and double check the connectors. Could this be transmission related? Possibly TC or fluid? One person sugested it, but I don't know enough about automatics to know how that might cause it. The SRX will lightly jerk when this is happening, but it doesn't feel like the transmission is slipping or anything. As I said, the RPM drops slightly and the exhaust note deepens like it's bogged down. Vacuum Leak maybe?

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    glake89's Avatar
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    Re: Flat spot and bogging down

    There are lots of codes that don't turn on the CEL but not usually powertrain related ones, like vacuum leaks. 'U' codes (lack of communication between modules) usually don't turn on CEL. Won't hurt to check if any codes are set (auto parts stores do it free).
    I know what you are describing but my old brain is in fade mode. Maybe it will come to me.
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    Re: Flat spot and bogging down

    Quote Originally Posted by Mr. Mohr View Post
    2004 SRX N* AWD
    I have a flat spot at partial throttle when cruising at speed. It only seems to happen once I'm at speed and am just driving with my big toe to keep it at speed or slightly accelerate. When it happens, there is a slight RPM drop and an audibly lower exhaust note. I can almost exactly replicate this if I am driving slow (35mph) in 5th (sport-manual) and try to accelerate, only difference is I have to give it more throttle to bog down when I do this (1/2 throttle or more), unlike when it normally bogs down it's always at slight (maybe 1/4 or less) throttle. No check engine light. Octane rating doesn't change this either. Any ideas? I have an upcoming trip and would like to try and fix this before I go if it's something repareable.
    Yes I have a few ideas. First, have you ever changed your fuel filter? It may be clogged and due for replacement. Filters often cause this type of behavior. Second, park the car in your driveway and open your driver door. Slowly rev up and try to mimic the issue you are seeing on the highway. Does the engine behave the same when the transmission is not engaged? If it doesn't, does it coincide with a gear shift? If so, replace transmission fluid.

  9. #8
    repnatl is offline Cadillac Owners Enthusiast
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    Any luck pulling the codes yet?

  10. #9
    Mr. Mohr's Avatar
    Mr. Mohr is offline Cadillac Owners Member
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    It must be in gear to replicate the condition. So either transmission, or simply under a load I'm guessing. The more I drive and think about it, the more I get a gut feeling of a transmission issue. I hope it's just fluid, and a flush and fill will cure everything. I'm going to see if there are any codes hiding tomorrow. That could sure help.

    ----------

    Oh, and yes I have done my fuel filter. That was my first guess, since it seemed to start after my wife drive cross country. I thought she picked up some bad gas or something. Also, plugs and air filter are both new too.

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