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    cmartell1978's Avatar
    cmartell1978 Posts: 7, Reputation: 1
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    #1

    Feb 2, 2007, 02:17 PM
    2003 Honda Civic Si - RPM's bouncing
    132,000 kms. 1.7L Automatic. Vtec.
    Car is idling funny. The RPM's will keep bouncing from around 500 to around 2000. I was driving on the highway the other day and my check engine light came on. I took it to my mechanic, and he said it was coming up with an error about my TPS sensor. Now, I know that it doesn't mean that my TPS sensor is bad, it just wasn't functioning right. On my civic, the TPS sensor is riveted to the throttle body. So before I replace the throttle body of 600 bucks, I want to know if there is anything else that could be causing this problem. The needle on my temperature gauge drops down to "C" from the normal midway point when my car is running idle when my blower is on high. Someone told me it might be a coolant temp sensor causing both problems. Does that make any sense? Please help, thanks.
    cmartell1978's Avatar
    cmartell1978 Posts: 7, Reputation: 1
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    #2

    Feb 2, 2007, 03:28 PM
    ?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #3

    Feb 2, 2007, 03:32 PM
    I noticed you were the guy I already tried to help who didn't like the solution.
    cmartell1978's Avatar
    cmartell1978 Posts: 7, Reputation: 1
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    #4

    Feb 2, 2007, 03:33 PM
    Did I ever say I didn't like your solution?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #5

    Feb 2, 2007, 03:35 PM
    Honestly, it was pretty obvious. Have you tried it?
    cmartell1978's Avatar
    cmartell1978 Posts: 7, Reputation: 1
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    #6

    Feb 2, 2007, 03:38 PM
    You told me to put a piece of cardboard to cover my radiator. I asked how come I never had to do that before, just this winter. I never tried it no, I assumed there was a more serious problem with my car. Thanks
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #7

    Feb 2, 2007, 03:43 PM
    Restrict the airflow through the radiator, by carefully rigging a plastic radiator cover (winter front). You may have to experiment with what's the proper size--better yet, make it adjustable. This is not an uncommon problem, during the winter, on some vehicles. I'm sure you have seen folding mechanical radiator covers on some delivery trucks. Your heater core, when the blower is turned on high, is acting like an efficient radiator and dropping the engine temperature too much. Therefore, I don't really think anything is wrong, per se, with your car. This should also improve your vehicle's performance and gas mileage, during the winter.

    You'll like these pictures:

    Winter fronts from Alaska Tent and Tarp
    Plastic, not cardboard.
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